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86f8827745
was less aligned than the old. In the testcase this results in an overaligned memset: the memset alignment was correct for the original memory but is too much for the new memory. Fix this by either increasing the alignment of the new memory or bailing out if that isn't possible. Should fix the gcc-4.7 self-host buildbot failure. llvm-svn: 165220
38 lines
1.3 KiB
LLVM
38 lines
1.3 KiB
LLVM
; RUN: opt < %s -S -basicaa -memcpyopt | FileCheck %s
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64"
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
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; The resulting memset is only 4-byte aligned, despite containing
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; a 16-byte aligned store in the middle.
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define void @foo(i32* %p) {
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; CHECK: @foo
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; CHECK: call void @llvm.memset.p0i8.i64(i8* {{.*}}, i8 0, i64 16, i32 4, i1 false)
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%a0 = getelementptr i32* %p, i64 0
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store i32 0, i32* %a0, align 4
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%a1 = getelementptr i32* %p, i64 1
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store i32 0, i32* %a1, align 16
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%a2 = getelementptr i32* %p, i64 2
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store i32 0, i32* %a2, align 4
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%a3 = getelementptr i32* %p, i64 3
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store i32 0, i32* %a3, align 4
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ret void
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}
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; Replacing %a8 with %a4 in the memset requires boosting the alignment of %a4.
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define void @bar() {
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; CHECK: @bar
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; CHECK: %a4 = alloca i32, align 8
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; CHECK-NOT: memcpy
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%a4 = alloca i32, align 4
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%a8 = alloca i32, align 8
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%a8.cast = bitcast i32* %a8 to i8*
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%a4.cast = bitcast i32* %a4 to i8*
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call void @llvm.memset.p0i8.i64(i8* %a8.cast, i8 0, i64 4, i32 8, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %a4.cast, i8* %a8.cast, i64 4, i32 4, i1 false)
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ret void
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}
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