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| author | Bradley Smith <bradley.smith@arm.com> | 2014-05-01 13:11:59 +0000 |
|---|---|---|
| committer | Bradley Smith <bradley.smith@arm.com> | 2014-05-01 13:11:59 +0000 |
| commit | 3567cc1b42bde124fbbaacb2f8cad1a0c49b4e84 (patch) | |
| tree | 171ebfea3d019bb1a16148504ea0697e62c0e488 | |
| parent | d5bbf36fcccc64038258fea37c444817df33293a (diff) | |
| download | bcm5719-llvm-3567cc1b42bde124fbbaacb2f8cad1a0c49b4e84.tar.gz bcm5719-llvm-3567cc1b42bde124fbbaacb2f8cad1a0c49b4e84.zip | |
[ARM64] Prefer generation of bzero on Darwin only
llvm-svn: 207760
| -rw-r--r-- | llvm/lib/Target/ARM64/ARM64Subtarget.cpp | 7 | ||||
| -rw-r--r-- | llvm/test/CodeGen/ARM64/memset-to-bzero.ll | 17 |
2 files changed, 17 insertions, 7 deletions
diff --git a/llvm/lib/Target/ARM64/ARM64Subtarget.cpp b/llvm/lib/Target/ARM64/ARM64Subtarget.cpp index 62a489fd86f..528cfc97cbf 100644 --- a/llvm/lib/Target/ARM64/ARM64Subtarget.cpp +++ b/llvm/lib/Target/ARM64/ARM64Subtarget.cpp @@ -90,8 +90,11 @@ ARM64Subtarget::ClassifyGlobalReference(const GlobalValue *GV, /// memset with zero passed as the second argument. Otherwise it /// returns null. const char *ARM64Subtarget::getBZeroEntry() const { - // At the moment, always prefer bzero. - return "bzero"; + // Prefer bzero on Darwin only. + if(isTargetDarwin()) + return "bzero"; + + return nullptr; } void ARM64Subtarget::overrideSchedPolicy(MachineSchedPolicy &Policy, diff --git a/llvm/test/CodeGen/ARM64/memset-to-bzero.ll b/llvm/test/CodeGen/ARM64/memset-to-bzero.ll index b28122cccd7..29036caabf3 100644 --- a/llvm/test/CodeGen/ARM64/memset-to-bzero.ll +++ b/llvm/test/CodeGen/ARM64/memset-to-bzero.ll @@ -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() ; CHECK: @fct1 @@ -14,7 +17,8 @@ declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) ; CHECK: @fct2 ; When the size is bigger than 256, change into bzero. -; CHECK: bzero +; CHECK-DARWIN: bzero +; CHECK-LINUX: memset define void @fct2(i8* nocapture %ptr) { entry: tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 257, i32 1, i1 false) @@ -23,7 +27,8 @@ entry: ; CHECK: @fct3 ; For unknown size, change to bzero. -; CHECK: bzero +; CHECK-DARWIN: bzero +; CHECK-LINUX: memset define void @fct3(i8* nocapture %ptr, i32 %unknown) { entry: %conv = sext i32 %unknown to i64 @@ -47,7 +52,8 @@ declare i64 @llvm.objectsize.i64(i8*, i1) ; CHECK: @fct5 ; Size > 256, change. -; CHECK: bzero +; CHECK-DARWIN: bzero +; CHECK-LINUX: memset define void @fct5(i8* %ptr) { entry: %tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false) @@ -57,7 +63,8 @@ entry: ; CHECK: @fct6 ; Size = unknown, change. -; CHECK: bzero +; CHECK-DARWIN: bzero +; CHECK-LINUX: memset define void @fct6(i8* %ptr, i32 %unknown) { entry: %conv = sext i32 %unknown to i64 |
