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7c4a4cfc1e
Once the invariant_start is reached, we know that no instruction *after* it can modify the memory. So, if we can prove the location isn't read *between entry into the loop and the execution of the invariant_start*, we can execute the invariant_start before entering the loop. Differential Revision: https://reviews.llvm.org/D51181 llvm-svn: 340617
139 lines
4.2 KiB
LLVM
139 lines
4.2 KiB
LLVM
; RUN: opt -licm -basicaa -licm-n2-threshold=0 < %s -S | FileCheck %s
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; RUN: opt -licm -basicaa -licm-n2-threshold=200 < %s -S | FileCheck %s --check-prefix=ALIAS-N2
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; RUN: opt -aa-pipeline=basic-aa -licm-n2-threshold=0 -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' < %s -S | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -licm-n2-threshold=200 -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' < %s -S | FileCheck %s --check-prefix=ALIAS-N2
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define void @test1(i1 %cond, i32* %ptr) {
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; CHECK-LABEL: @test1(
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; CHECK-LABEL: entry:
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; CHECK: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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; CHECK: %val = load i32, i32* %ptr
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; CHECK-LABEL: loop:
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; ALIAS-N2-LABEL: @test1(
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; ALIAS-N2-LABEL: entry:
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; ALIAS-N2: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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; ALIAS-N2: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: loop:
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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%val = load i32, i32* %ptr
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%x.inc = add i32 %x, %val
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br label %loop
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}
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;; despite the loop varying invariant.start, we should be
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;; able to hoist the load
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define void @test2(i1 %cond, i32* %ptr) {
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; CHECK-LABEL: @test2(
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; CHECK-LABEL: entry:
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; CHECK: %val = load i32, i32* %ptr
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; CHECK-LABEL: loop:
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; CHECK: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %piv)
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; ALIAS-N2-LABEL: @test2(
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; ALIAS-N2-LABEL: entry:
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; ALIAS-N2: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: loop:
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; ALIAS-N2: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %piv)
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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%piv = getelementptr i32, i32* %ptr, i32 %x
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call {}* @llvm.invariant.start.p0i32(i64 4, i32* %piv)
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%val = load i32, i32* %ptr
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%x.inc = add i32 %x, %val
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br label %loop
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}
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define void @test3(i1 %cond, i32* %ptr) {
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; CHECK-LABEL: @test3(
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; CHECK-LABEL: entry:
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; CHECK: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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; CHECK: %val = load i32, i32* %ptr
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; CHECK-LABEL: loop:
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; ALIAS-N2-LABEL: @test3(
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; ALIAS-N2-LABEL: entry:
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; ALIAS-N2: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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; ALIAS-N2: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: loop:
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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%val = load i32, i32* %ptr
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%p2 = getelementptr i32, i32* %ptr, i32 1
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store volatile i32 0, i32* %p2
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%x.inc = add i32 %x, %val
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br label %loop
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}
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; can't hoist due to init in loop, only well defined if loop exits
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; on first iteration, but we don't bother checking for that currently
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define void @test4(i1 %cond, i32* %ptr) {
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; CHECK-LABEL: @test4(
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; CHECK-LABEL: entry:
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; CHECK-LABEL: loop:
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; CHECK: store i32 0, i32* %ptr
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; CHECK: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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; CHECK: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: @test4(
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; ALIAS-N2-LABEL: entry:
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; ALIAS-N2-LABEL: loop:
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; ALIAS-N2: store i32 0, i32* %ptr
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; ALIAS-N2: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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; ALIAS-N2: %val = load i32, i32* %ptr
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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store i32 0, i32* %ptr
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call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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%val = load i32, i32* %ptr
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%x.inc = add i32 %x, %val
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br label %loop
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}
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; don't try to reason about scopes
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define void @test5(i1 %cond, i32* %ptr) {
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; CHECK-LABEL: @test5(
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; CHECK-LABEL: entry:
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; CHECK-LABEL: loop:
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; CHECK: store i32 0, i32* %ptr
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; CHECK: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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; CHECK: %val = load i32, i32* %ptr
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; ALIAS-N2-LABEL: @test5(
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; ALIAS-N2-LABEL: entry:
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; ALIAS-N2-LABEL: loop:
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; ALIAS-N2: store i32 0, i32* %ptr
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; ALIAS-N2: call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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; ALIAS-N2: %val = load i32, i32* %ptr
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entry:
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br label %loop
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loop:
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%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
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store i32 0, i32* %ptr
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%scope = call {}* @llvm.invariant.start.p0i32(i64 4, i32* %ptr)
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%val = load i32, i32* %ptr
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call void @llvm.invariant.end.p0i32({}* %scope, i64 4, i32* %ptr)
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%x.inc = add i32 %x, %val
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br label %loop
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}
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declare {}* @llvm.invariant.start.p0i32(i64, i32*)
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declare void @llvm.invariant.end.p0i32({}*, i64, i32*)
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