109 lines
3.0 KiB
LLVM
109 lines
3.0 KiB
LLVM
; RUN: llc %s -mtriple=arm64-apple-darwin -o - | \
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; RUN: FileCheck --check-prefix=CHECK-DARWIN --check-prefix=CHECK %s
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; RUN: llc %s -mtriple=arm64-linux-gnu -o - | \
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; RUN: FileCheck --check-prefix=CHECK-LINUX --check-prefix=CHECK %s
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; <rdar://problem/14199482> ARM64: Calls to bzero() replaced with calls to memset()
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; CHECK: @fct1
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; For small size (<= 256), we do not change memset to bzero.
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; CHECK: memset
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define void @fct1(i8* nocapture %ptr) {
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entry:
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tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 256, i32 1, i1 false)
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ret void
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}
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1)
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; CHECK: @fct2
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; When the size is bigger than 256, change into bzero.
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; CHECK-DARWIN: bzero
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; CHECK-LINUX: memset
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define void @fct2(i8* nocapture %ptr) {
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entry:
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tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 257, i32 1, i1 false)
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ret void
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}
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; CHECK: @fct3
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; For unknown size, change to bzero.
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; CHECK-DARWIN: bzero
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; CHECK-LINUX: memset
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define void @fct3(i8* nocapture %ptr, i32 %unknown) {
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entry:
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%conv = sext i32 %unknown to i64
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tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 %conv, i32 1, i1 false)
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ret void
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}
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; CHECK: @fct4
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; Size <= 256, no change.
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; CHECK: memset
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define void @fct4(i8* %ptr) {
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entry:
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%tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
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%call = tail call i8* @__memset_chk(i8* %ptr, i32 0, i64 256, i64 %tmp)
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ret void
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}
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declare i8* @__memset_chk(i8*, i32, i64, i64)
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declare i64 @llvm.objectsize.i64(i8*, i1)
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; CHECK: @fct5
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; Size > 256, change.
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; CHECK-DARWIN: bzero
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; CHECK-LINUX: memset
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define void @fct5(i8* %ptr) {
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entry:
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%tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
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%call = tail call i8* @__memset_chk(i8* %ptr, i32 0, i64 257, i64 %tmp)
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ret void
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}
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; CHECK: @fct6
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; Size = unknown, change.
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; CHECK-DARWIN: bzero
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; CHECK-LINUX: memset
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define void @fct6(i8* %ptr, i32 %unknown) {
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entry:
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%conv = sext i32 %unknown to i64
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%tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
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%call = tail call i8* @__memset_chk(i8* %ptr, i32 0, i64 %conv, i64 %tmp)
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ret void
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}
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; Next functions check that memset is not turned into bzero
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; when the set constant is non-zero, whatever the given size.
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; CHECK: @fct7
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; memset with something that is not a zero, no change.
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; CHECK: memset
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define void @fct7(i8* %ptr) {
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entry:
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%tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
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%call = tail call i8* @__memset_chk(i8* %ptr, i32 1, i64 256, i64 %tmp)
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ret void
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}
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; CHECK: @fct8
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; memset with something that is not a zero, no change.
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; CHECK: memset
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define void @fct8(i8* %ptr) {
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entry:
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%tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
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%call = tail call i8* @__memset_chk(i8* %ptr, i32 1, i64 257, i64 %tmp)
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ret void
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}
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; CHECK: @fct9
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; memset with something that is not a zero, no change.
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; CHECK: memset
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define void @fct9(i8* %ptr, i32 %unknown) {
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entry:
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%conv = sext i32 %unknown to i64
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%tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
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%call = tail call i8* @__memset_chk(i8* %ptr, i32 1, i64 %conv, i64 %tmp)
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ret void
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}
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