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[ARM64] Prefer generation of bzero on Darwin only

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bradley Smith
2014-05-01 13:11:59 +00:00
parent 68a7a88223
commit b378cacf1d
2 changed files with 17 additions and 7 deletions
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5
lib/Target/ARM64/ARM64Subtarget.cpp
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@@ -90,8 +90,11 @@ ARM64Subtarget::ClassifyGlobalReference(const GlobalValue *GV,
/// memset with zero passed as the second argument. Otherwise it /// memset with zero passed as the second argument. Otherwise it
/// returns null. /// returns null.
const char *ARM64Subtarget::getBZeroEntry() const { const char *ARM64Subtarget::getBZeroEntry() const {
// At the moment, always prefer bzero. // Prefer bzero on Darwin only.
if(isTargetDarwin())
return "bzero"; return "bzero";
return nullptr;
} }
void ARM64Subtarget::overrideSchedPolicy(MachineSchedPolicy &Policy, void ARM64Subtarget::overrideSchedPolicy(MachineSchedPolicy &Policy,

17
test/CodeGen/ARM64/memset-to-bzero.ll
View File

@@ -1,4 +1,7 @@
; RUN: llc %s -march arm64 -o - | FileCheck %s ; RUN: llc %s -mtriple=arm64-apple-darwin -o - | \
; RUN: FileCheck --check-prefix=CHECK-DARWIN --check-prefix=CHECK %s
; RUN: llc %s -mtriple=arm64-linux-gnu -o - | \
; RUN: FileCheck --check-prefix=CHECK-LINUX --check-prefix=CHECK %s
; <rdar://problem/14199482> ARM64: Calls to bzero() replaced with calls to memset() ; <rdar://problem/14199482> ARM64: Calls to bzero() replaced with calls to memset()
; CHECK: @fct1 ; CHECK: @fct1
@@ -14,7 +17,8 @@ declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1)
; CHECK: @fct2 ; CHECK: @fct2
; When the size is bigger than 256, change into bzero. ; When the size is bigger than 256, change into bzero.
; CHECK: bzero ; CHECK-DARWIN: bzero
; CHECK-LINUX: memset
define void @fct2(i8* nocapture %ptr) { define void @fct2(i8* nocapture %ptr) {
entry: entry:
tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 257, i32 1, i1 false) tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 257, i32 1, i1 false)
@@ -23,7 +27,8 @@ entry:
; CHECK: @fct3 ; CHECK: @fct3
; For unknown size, change to bzero. ; For unknown size, change to bzero.
; CHECK: bzero ; CHECK-DARWIN: bzero
; CHECK-LINUX: memset
define void @fct3(i8* nocapture %ptr, i32 %unknown) { define void @fct3(i8* nocapture %ptr, i32 %unknown) {
entry: entry:
%conv = sext i32 %unknown to i64 %conv = sext i32 %unknown to i64
@@ -47,7 +52,8 @@ declare i64 @llvm.objectsize.i64(i8*, i1)
; CHECK: @fct5 ; CHECK: @fct5
; Size > 256, change. ; Size > 256, change.
; CHECK: bzero ; CHECK-DARWIN: bzero
; CHECK-LINUX: memset
define void @fct5(i8* %ptr) { define void @fct5(i8* %ptr) {
entry: entry:
%tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false) %tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
@@ -57,7 +63,8 @@ entry:
; CHECK: @fct6 ; CHECK: @fct6
; Size = unknown, change. ; Size = unknown, change.
; CHECK: bzero ; CHECK-DARWIN: bzero
; CHECK-LINUX: memset
define void @fct6(i8* %ptr, i32 %unknown) { define void @fct6(i8* %ptr, i32 %unknown) {
entry: entry:
%conv = sext i32 %unknown to i64 %conv = sext i32 %unknown to i64