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llvm-mirror/test/Transforms/LoopIdiom/basic.ll
Chris Lattner cc2fa12fac rewrite the memset_pattern pattern generation stuff to accept any 2/4/8/16-byte 
constant, including globals.  This makes us generate much more "pretty" pattern
globals as well because it doesn't break it down to an array of bytes all the
time.

This enables us to handle stores of relocatable globals.  This kicks in about
48 times in 254.gap, giving us stuff like this:

@.memset_pattern40 = internal constant [2 x %struct.TypHeader* (%struct.TypHeader*, %struct.TypHeader*)*] [%struct.TypHeader* (%struct.TypHeader*, %struct
.TypHeader*)* @IsFalse, %struct.TypHeader* (%struct.TypHeader*, %struct.TypHeader*)* @IsFalse], align 16

...
  call void @memset_pattern16(i8* %scevgep5859, i8* bitcast ([2 x %struct.TypHeader* (%struct.TypHeader*, %struct.TypHeader*)*]* @.memset_pattern40 to i8*
), i64 %tmp75) nounwind

llvm-svn: 126044
2011-02-19 19:56:44 +00:00

350 lines
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; RUN: opt -basicaa -loop-idiom < %s -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0.0"
define void @test1(i8* %Base, i64 %Size) nounwind ssp {
bb.nph: ; preds = %entry
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8* %Base, i64 %indvar
store i8 0, i8* %I.0.014, align 1
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK: @test1
; CHECK: call void @llvm.memset.p0i8.i64(i8* %Base, i8 0, i64 %Size, i32 1, i1 false)
; CHECK-NOT: store
}
; This is a loop that was rotated but where the blocks weren't merged. This
; shouldn't perturb us.
define void @test1a(i8* %Base, i64 %Size) nounwind ssp {
bb.nph: ; preds = %entry
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body.cont ]
%I.0.014 = getelementptr i8* %Base, i64 %indvar
store i8 0, i8* %I.0.014, align 1
%indvar.next = add i64 %indvar, 1
br label %for.body.cont
for.body.cont:
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK: @test1a
; CHECK: call void @llvm.memset.p0i8.i64(i8* %Base, i8 0, i64 %Size, i32 1, i1 false)
; CHECK-NOT: store
}
define void @test2(i32* %Base, i64 %Size) nounwind ssp {
entry:
%cmp10 = icmp eq i64 %Size, 0
br i1 %cmp10, label %for.end, label %for.body
for.body: ; preds = %entry, %for.body
%i.011 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
%add.ptr.i = getelementptr i32* %Base, i64 %i.011
store i32 16843009, i32* %add.ptr.i, align 4
%inc = add nsw i64 %i.011, 1
%exitcond = icmp eq i64 %inc, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK: @test2
; CHECK: br i1 %cmp10,
; CHECK: %tmp = mul i64 %Size, 4
; CHECK: call void @llvm.memset.p0i8.i64(i8* %Base1, i8 1, i64 %tmp, i32 4, i1 false)
; CHECK-NOT: store
}
; This is a case where there is an extra may-aliased store in the loop, we can't
; promote the memset.
define void @test3(i32* %Base, i64 %Size, i8 *%MayAlias) nounwind ssp {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%i.011 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
%add.ptr.i = getelementptr i32* %Base, i64 %i.011
store i32 16843009, i32* %add.ptr.i, align 4
store i8 42, i8* %MayAlias
%inc = add nsw i64 %i.011, 1
%exitcond = icmp eq i64 %inc, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %entry
ret void
; CHECK: @test3
; CHECK-NOT: memset
; CHECK: ret void
}
;; TODO: We should be able to promote this memset. Not yet though.
define void @test4(i8* %Base) nounwind ssp {
bb.nph: ; preds = %entry
%Base100 = getelementptr i8* %Base, i64 1000
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8* %Base, i64 %indvar
store i8 0, i8* %I.0.014, align 1
;; Store beyond the range memset, should be safe to promote.
store i8 42, i8* %Base100
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, 100
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK-TODO: @test4
; CHECK-TODO: call void @llvm.memset.p0i8.i64(i8* %Base, i8 0, i64 100, i32 1, i1 false)
; CHECK-TODO-NOT: store
}
; This can't be promoted: the memset is a store of a loop variant value.
define void @test5(i8* %Base, i64 %Size) nounwind ssp {
bb.nph: ; preds = %entry
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8* %Base, i64 %indvar
%V = trunc i64 %indvar to i8
store i8 %V, i8* %I.0.014, align 1
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK: @test5
; CHECK-NOT: memset
; CHECK: ret void
}
;; memcpy formation
define void @test6(i64 %Size) nounwind ssp {
bb.nph:
%Base = alloca i8, i32 10000
%Dest = alloca i8, i32 10000
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8* %Base, i64 %indvar
%DestI = getelementptr i8* %Dest, i64 %indvar
%V = load i8* %I.0.014, align 1
store i8 %V, i8* %DestI, align 1
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK: @test6
; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %Dest, i8* %Base, i64 %Size, i32 1, i1 false)
; CHECK-NOT: store
; CHECK: ret void
}
; This is a loop that was rotated but where the blocks weren't merged. This
; shouldn't perturb us.
define void @test7(i8* %Base, i64 %Size) nounwind ssp {
bb.nph: ; preds = %entry
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body.cont ]
br label %for.body.cont
for.body.cont:
%I.0.014 = getelementptr i8* %Base, i64 %indvar
store i8 0, i8* %I.0.014, align 1
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK: @test7
; CHECK: call void @llvm.memset.p0i8.i64(i8* %Base, i8 0, i64 %Size, i32 1, i1 false)
; CHECK-NOT: store
}
; This is a loop should not be transformed, it only executes one iteration.
define void @test8(i64* %Ptr, i64 %Size) nounwind ssp {
bb.nph: ; preds = %entry
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%PI = getelementptr i64* %Ptr, i64 %indvar
store i64 0, i64 *%PI
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, 1
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK: @test8
; CHECK: store i64 0, i64* %PI
}
declare i8* @external(i8*)
;; This cannot be transformed into a memcpy, because the read-from location is
;; mutated by the loop.
define void @test9(i64 %Size) nounwind ssp {
bb.nph:
%Base = alloca i8, i32 10000
%Dest = alloca i8, i32 10000
%BaseAlias = call i8* @external(i8* %Base)
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8* %Base, i64 %indvar
%DestI = getelementptr i8* %Dest, i64 %indvar
%V = load i8* %I.0.014, align 1
store i8 %V, i8* %DestI, align 1
;; This store can clobber the input.
store i8 4, i8* %BaseAlias
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
; CHECK: @test9
; CHECK-NOT: llvm.memcpy
; CHECK: ret void
}
; Two dimensional nested loop should be promoted to one big memset.
define void @test10(i8* %X) nounwind ssp {
entry:
br label %bb.nph
bb.nph: ; preds = %entry, %for.inc10
%i.04 = phi i32 [ 0, %entry ], [ %inc12, %for.inc10 ]
br label %for.body5
for.body5: ; preds = %for.body5, %bb.nph
%j.02 = phi i32 [ 0, %bb.nph ], [ %inc, %for.body5 ]
%mul = mul nsw i32 %i.04, 100
%add = add nsw i32 %j.02, %mul
%idxprom = sext i32 %add to i64
%arrayidx = getelementptr inbounds i8* %X, i64 %idxprom
store i8 0, i8* %arrayidx, align 1
%inc = add nsw i32 %j.02, 1
%cmp4 = icmp eq i32 %inc, 100
br i1 %cmp4, label %for.inc10, label %for.body5
for.inc10: ; preds = %for.body5
%inc12 = add nsw i32 %i.04, 1
%cmp = icmp eq i32 %inc12, 100
br i1 %cmp, label %for.end13, label %bb.nph
for.end13: ; preds = %for.inc10
ret void
; CHECK: @test10
; CHECK: entry:
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* %X, i8 0, i64 10000, i32 1, i1 false)
; CHECK-NOT: store
; CHECK: ret void
}
; On darwin10 (which is the triple in this .ll file) this loop can be turned
; into a memset_pattern call.
; rdar://9009151
define void @test11_pattern(i32* nocapture %P) nounwind ssp {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.body ]
%arrayidx = getelementptr i32* %P, i64 %indvar
store i32 1, i32* %arrayidx, align 4
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, 10000
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
; CHECK: @test11_pattern
; CHECK-NEXT: entry:
; CHECK-NEXT: bitcast
; CHECK-NEXT: memset_pattern
; CHECK-NOT: store
; CHECK: ret void
}
; Store of null should turn into memset of zero.
define void @test12(i32** nocapture %P) nounwind ssp {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.body ]
%arrayidx = getelementptr i32** %P, i64 %indvar
store i32* null, i32** %arrayidx, align 4
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, 10000
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
; CHECK: @test12
; CHECK-NEXT: entry:
; CHECK-NEXT: bitcast
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* %P1, i8 0, i64 80000, i32 4, i1 false)
; CHECK-NOT: store
; CHECK: ret void
}
@G = global i32 5
; This store-of-address loop can be turned into a memset_pattern call.
; rdar://9009151
define void @test13_pattern(i32** nocapture %P) nounwind ssp {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.body ]
%arrayidx = getelementptr i32** %P, i64 %indvar
store i32* @G, i32** %arrayidx, align 4
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, 10000
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
; CHECK: @test13_pattern
; CHECK-NEXT: entry:
; CHECK-NEXT: bitcast
; CHECK-NEXT: memset_pattern
; CHECK-NOT: store
; CHECK: ret void
}
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