mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-19 11:02:59 +02:00
e4e892e8a9
Summary:
If the instruction we're hoisting out of a loop into its preheader is
guaranteed to have executed in the loop, then the metadata associated
with the instruction (e.g. !range or !dereferenceable) is valid in the
preheader. This is because once we're in the preheader, we know we're
eventually going to reach the location the metadata was valid at.
This change makes LICM smarter around this, and helps it recognize cases
like these:
```
do {
int a = *ptr; !range !0
...
} while (i++ < N);
```
to
```
int a = *ptr; !range !0
do {
...
} while (i++ < N);
```
Earlier we'd drop the `!range` metadata after hoisting the load from
`ptr`.
Reviewers: igor-laevsky
Subscribers: mcrosier, llvm-commits
Differential Revision: http://reviews.llvm.org/D16669
llvm-svn: 259053
474 lines
17 KiB
LLVM
474 lines
17 KiB
LLVM
; RUN: opt -S -basicaa -licm < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; This test represents the following function:
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; void test1(int * __restrict__ a, int * __restrict__ b, int &c, int n) {
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; for (int i = 0; i < n; ++i)
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; if (a[i] > 0)
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; a[i] = c*b[i];
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; }
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; and we want to hoist the load of %c out of the loop. This can be done only
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; because the dereferenceable attribute is on %c.
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; CHECK-LABEL: @test1
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; CHECK: load i32, i32* %c, align 4
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; CHECK: for.body:
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define void @test1(i32* noalias nocapture %a, i32* noalias nocapture readonly %b, i32* nocapture readonly nonnull dereferenceable(4) %c, i32 %n) #0 {
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entry:
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%1 = load i32, i32* %c, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
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store i32 %mul, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; This is the same as @test1, but without the dereferenceable attribute on %c.
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; Without this attribute, we should not hoist the load of %c.
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; CHECK-LABEL: @test2
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; CHECK: if.then:
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; CHECK: load i32, i32* %c, align 4
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define void @test2(i32* noalias nocapture %a, i32* noalias nocapture readonly %b, i32* nocapture readonly nonnull %c, i32 %n) #0 {
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entry:
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%1 = load i32, i32* %c, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
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store i32 %mul, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; This test represents the following function:
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; void test3(int * restrict a, int * restrict b, int c[static 3], int n) {
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; for (int i = 0; i < n; ++i)
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; if (a[i] > 0)
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; a[i] = c[2]*b[i];
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; }
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; and we want to hoist the load of c[2] out of the loop. This can be done only
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; because the dereferenceable attribute is on %c.
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; CHECK-LABEL: @test3
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; CHECK: load i32, i32* %c2, align 4
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; CHECK: for.body:
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define void @test3(i32* noalias nocapture %a, i32* noalias nocapture readonly %b, i32* nocapture readonly dereferenceable(12) %c, i32 %n) #0 {
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entry:
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%c2 = getelementptr inbounds i32, i32* %c, i64 2
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%1 = load i32, i32* %c2, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
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store i32 %mul, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; This is the same as @test3, but with a dereferenceable attribute on %c with a
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; size too small to cover c[2] (and so we should not hoist it).
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; CHECK-LABEL: @test4
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; CHECK: if.then:
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; CHECK: load i32, i32* %c2, align 4
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define void @test4(i32* noalias nocapture %a, i32* noalias nocapture readonly %b, i32* nocapture readonly dereferenceable(11) %c, i32 %n) #0 {
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entry:
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%c2 = getelementptr inbounds i32, i32* %c, i64 2
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%1 = load i32, i32* %c2, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
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store i32 %mul, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; This test represents the following function:
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; void test1(int * __restrict__ a, int *b, int &c, int n) {
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; if (c != null)
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; for (int i = 0; i < n; ++i)
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; if (a[i] > 0)
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; a[i] = c*b[i];
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; }
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; and we want to hoist the load of %c out of the loop. This can be done only
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; because the dereferenceable_or_null attribute is on %c and there is a null
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; check on %c.
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; CHECK-LABEL: @test5
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; CHECK: load i32, i32* %c, align 4
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; CHECK: for.body:
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define void @test5(i32* noalias %a, i32* %b, i32* dereferenceable_or_null(4) %c, i32 %n) #0 {
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entry:
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%not_null = icmp ne i32* %c, null
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br i1 %not_null, label %not.null, label %for.end
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not.null:
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %not.null, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %not.null ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%1 = load i32, i32* %c, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
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store i32 %mul, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry, %not.null
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ret void
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}
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; This is the same as @test5, but without the null check on %c.
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; Without this check, we should not hoist the load of %c.
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; This test case has an icmp on c but the use of this comparison is
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; not a branch.
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; CHECK-LABEL: @test6
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; CHECK: if.then:
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; CHECK: load i32, i32* %c, align 4
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define i1 @test6(i32* noalias %a, i32* %b, i32* dereferenceable_or_null(4) %c, i32 %n) #0 {
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entry:
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%not_null = icmp ne i32* %c, null
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%1 = load i32, i32* %c, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
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store i32 %mul, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry
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ret i1 %not_null
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}
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; This test represents the following function:
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; void test1(int * __restrict__ a, int *b, int **cptr, int n) {
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; c = *cptr;
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; for (int i = 0; i < n; ++i)
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; if (a[i] > 0)
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; a[i] = (*c)*b[i];
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; }
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; and we want to hoist the load of %c out of the loop. This can be done only
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; because the dereferenceable meatdata on the c = *cptr load.
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; CHECK-LABEL: @test7
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; CHECK: load i32, i32* %c, align 4
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; CHECK: for.body:
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define void @test7(i32* noalias %a, i32* %b, i32** %cptr, i32 %n) #0 {
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entry:
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%c = load i32*, i32** %cptr, !dereferenceable !0
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%1 = load i32, i32* %c, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
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store i32 %mul, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; This test represents the following function:
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; void test1(int * __restrict__ a, int *b, int **cptr, int n) {
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; c = *cptr;
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; if (c != null)
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; for (int i = 0; i < n; ++i)
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; if (a[i] > 0)
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; a[i] = (*c)*b[i];
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; }
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; and we want to hoist the load of %c out of the loop. This can be done only
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; because the dereferenceable_or_null meatdata on the c = *cptr load and there
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; is a null check on %c.
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; CHECK-LABEL: @test8
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; CHECK: load i32, i32* %c, align 4
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; CHECK: for.body:
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define void @test8(i32* noalias %a, i32* %b, i32** %cptr, i32 %n) #0 {
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entry:
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%c = load i32*, i32** %cptr, !dereferenceable_or_null !0
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%not_null = icmp ne i32* %c, null
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br i1 %not_null, label %not.null, label %for.end
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not.null:
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %not.null, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %not.null ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%1 = load i32, i32* %c, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
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store i32 %mul, i32* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry, %not.null
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ret void
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}
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; This is the same as @test8, but without the null check on %c.
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; Without this check, we should not hoist the load of %c.
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; CHECK-LABEL: @test9
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; CHECK: if.then:
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; CHECK: load i32, i32* %c, align 4
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define void @test9(i32* noalias %a, i32* %b, i32** %cptr, i32 %n) #0 {
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entry:
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%c = load i32*, i32** %cptr, !dereferenceable_or_null !0
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%cmp11 = icmp sgt i32 %n, 0
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br i1 %cmp11, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 0
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%1 = load i32, i32* %c, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%2 = load i32, i32* %arrayidx3, align 4
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%mul = mul nsw i32 %2, %1
|
|
store i32 %mul, i32* %arrayidx, align 4
|
|
br label %for.inc
|
|
|
|
for.inc: ; preds = %for.body, %if.then
|
|
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
|
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
|
|
%exitcond = icmp eq i32 %lftr.wideiv, %n
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.inc, %entry
|
|
ret void
|
|
}
|
|
|
|
; In this test we should be able to only hoist load from %cptr. We can't hoist
|
|
; load from %c because it's dereferenceability can depend on %cmp1 condition.
|
|
; By moving it out of the loop we break this dependency and can not rely
|
|
; on the dereferenceability anymore.
|
|
; In other words this test checks that we strip dereferenceability metadata
|
|
; after hoisting an instruction.
|
|
|
|
; CHECK-LABEL: @test10
|
|
; CHECK: %c = load i32*, i32** %cptr
|
|
; CHECK-NOT: dereferenceable
|
|
; CHECK: if.then:
|
|
; CHECK: load i32, i32* %c, align 4
|
|
|
|
define void @test10(i32* noalias %a, i32* %b, i32** dereferenceable(8) %cptr, i32 %n) #0 {
|
|
entry:
|
|
%cmp11 = icmp sgt i32 %n, 0
|
|
br i1 %cmp11, label %for.body, label %for.end
|
|
|
|
for.body: ; preds = %entry, %for.inc
|
|
%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
|
|
%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
|
|
%0 = load i32, i32* %arrayidx, align 4
|
|
%cmp1 = icmp sgt i32 %0, 0
|
|
br i1 %cmp1, label %if.then, label %for.inc
|
|
|
|
if.then: ; preds = %for.body
|
|
%c = load i32*, i32** %cptr, !dereferenceable !0
|
|
%1 = load i32, i32* %c, align 4
|
|
%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
|
|
%2 = load i32, i32* %arrayidx3, align 4
|
|
%mul = mul nsw i32 %2, %1
|
|
store i32 %mul, i32* %arrayidx, align 4
|
|
br label %for.inc
|
|
|
|
for.inc: ; preds = %for.body, %if.then
|
|
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
|
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
|
|
%exitcond = icmp eq i32 %lftr.wideiv, %n
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.inc, %entry
|
|
ret void
|
|
}
|
|
|
|
define void @test11(i32* noalias %a, i32* %b, i32** dereferenceable(8) %cptr, i32 %n) #0 {
|
|
; CHECK-LABEL: @test11(
|
|
entry:
|
|
%cmp11 = icmp sgt i32 %n, 0
|
|
br i1 %cmp11, label %for.body, label %for.end
|
|
|
|
; CHECK: for.body.preheader:
|
|
; CHECK: %c = load i32*, i32** %cptr, !dereferenceable !0
|
|
; CHECK: %d = load i32, i32* %c, align 4
|
|
|
|
|
|
for.body: ; preds = %entry, %for.inc
|
|
%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
|
|
%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
|
|
%0 = load i32, i32* %arrayidx, align 4
|
|
%cmp1 = icmp sgt i32 %0, 0
|
|
%c = load i32*, i32** %cptr, !dereferenceable !0
|
|
br i1 %cmp1, label %if.then, label %for.inc
|
|
|
|
if.then: ; preds = %for.body
|
|
%d = load i32, i32* %c, align 4
|
|
%arrayidx3 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
|
|
%e = load i32, i32* %arrayidx3, align 4
|
|
%mul = mul nsw i32 %e, %d
|
|
store i32 %mul, i32* %arrayidx, align 4
|
|
br label %for.inc
|
|
|
|
for.inc: ; preds = %for.body, %if.then
|
|
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
|
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
|
|
%exitcond = icmp eq i32 %lftr.wideiv, %n
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.inc, %entry
|
|
ret void
|
|
}
|
|
|
|
attributes #0 = { nounwind uwtable }
|
|
!0 = !{i64 4}
|