[PATCH] D36361: [X86] Enable isel to use the PAUSE instruction even when SSE2 is disabled

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This revision was automatically updated to reflect the committed changes.
Closed by commit rL310190: [X86] Enable isel to use the PAUSE instruction even when SSE2 is disabled (authored by ctopper).

Changed prior to commit:
  https://reviews.llvm.org/D36361?vs=109895&id=109901#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D36361

Files:
  llvm/trunk/lib/Target/X86/X86InstrSSE.td
  llvm/trunk/test/CodeGen/X86/pause.ll


Index: llvm/trunk/lib/Target/X86/X86InstrSSE.td
===================================================================
--- llvm/trunk/lib/Target/X86/X86InstrSSE.td
+++ llvm/trunk/lib/Target/X86/X86InstrSSE.td
@@ -3695,8 +3695,7 @@
 // Pause. This "instruction" is encoded as "rep; nop", so even though it
 // was introduced with SSE2, it's backward compatible.
 def PAUSE : I<0x90, RawFrm, (outs), (ins),
-              "pause", [(int_x86_sse2_pause)], IIC_SSE_PAUSE>,
-              OBXS, Requires<[HasSSE2]>;
+              "pause", [(int_x86_sse2_pause)], IIC_SSE_PAUSE>, OBXS;
 }
 
 let SchedRW = [WriteFence] in {
Index: llvm/trunk/test/CodeGen/X86/pause.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/pause.ll
+++ llvm/trunk/test/CodeGen/X86/pause.ll
@@ -0,0 +1,15 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -disable-peephole -mtriple=i386-apple-darwin -mattr=-sse -show-mc-encoding | FileCheck %s
+; RUN: llc < %s -disable-peephole -mtriple=i386-apple-darwin -mattr=-avx,+sse2 -show-mc-encoding | FileCheck %s
+; RUN: llc < %s -disable-peephole -mtriple=i386-apple-darwin -mattr=+avx2 -show-mc-encoding | FileCheck %s
+; RUN: llc < %s -disable-peephole -mtriple=i386-apple-darwin -mcpu=skx -show-mc-encoding | FileCheck %s
+
+define void @test_x86_sse2_pause() {
+; CHECK-LABEL: test_x86_sse2_pause:
+; CHECK:       ## BB#0:
+; CHECK-NEXT:    pause ## encoding: [0xf3,0x90]
+; CHECK-NEXT:    retl ## encoding: [0xc3]
+  tail call void @llvm.x86.sse2.pause()
+  ret void
+}
+declare void @llvm.x86.sse2.pause() nounwind


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