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------------------------------------------------------------------------ r310190 | ctopper | 2017-08-05 16:34:44 -0700 (Sat, 05 Aug 2017) | 18 lines [X86] Enable isel to use the PAUSE instruction even when SSE2 is disabled Summary: On older processors this instruction encoding is treated as a NOP. MSVC doesn't disable intrinsics based on features the way clang/gcc does. Because the PAUSE instruction encoding doesn't crash older processors, some software out there uses these intrinsics without checking for SSE2. This change also seems to also be consistent with gcc behavior. Fixes PR34079 Reviewers: RKSimon, zvi Reviewed By: RKSimon Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D36361 ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_50@310293 91177308-0d34-0410-b5e6-96231b3b80d8
16 lines
793 B
LLVM
16 lines
793 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -disable-peephole -mtriple=i386-apple-darwin -mattr=-sse -show-mc-encoding | FileCheck %s
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; RUN: llc < %s -disable-peephole -mtriple=i386-apple-darwin -mattr=-avx,+sse2 -show-mc-encoding | FileCheck %s
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; RUN: llc < %s -disable-peephole -mtriple=i386-apple-darwin -mattr=+avx2 -show-mc-encoding | FileCheck %s
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; RUN: llc < %s -disable-peephole -mtriple=i386-apple-darwin -mcpu=skx -show-mc-encoding | FileCheck %s
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define void @test_x86_sse2_pause() {
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; CHECK-LABEL: test_x86_sse2_pause:
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; CHECK: ## BB#0:
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; CHECK-NEXT: pause ## encoding: [0xf3,0x90]
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; CHECK-NEXT: retl ## encoding: [0xc3]
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tail call void @llvm.x86.sse2.pause()
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ret void
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}
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declare void @llvm.x86.sse2.pause() nounwind
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