[llvm] r195697 - Add an intrinsic for the SSE2 PAUSE instruction.

[Cameron McInally]

Author: mcinally
Date: Mon Nov 25 18:20:43 2013
New Revision: 195697

URL: http://llvm.org/viewvc/llvm-project?rev=195697&view=rev
Log:
Add an intrinsic for the SSE2 PAUSE instruction.

Modified:
    llvm/trunk/include/llvm/IR/IntrinsicsX86.td
    llvm/trunk/lib/Target/X86/X86InstrSSE.td
    llvm/trunk/test/CodeGen/X86/sse2-intrinsics-x86.ll

Modified: llvm/trunk/include/llvm/IR/IntrinsicsX86.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/IntrinsicsX86.td?rev=195697&r1=195696&r2=195697&view=diff
==============================================================================
--- llvm/trunk/include/llvm/IR/IntrinsicsX86.td (original)
+++ llvm/trunk/include/llvm/IR/IntrinsicsX86.td Mon Nov 25 18:20:43 2013
@@ -536,6 +536,8 @@ let TargetPrefix = "x86" in {  // All in
               Intrinsic<[], [], []>;
   def int_x86_sse2_mfence : GCCBuiltin<"__builtin_ia32_mfence">,
               Intrinsic<[], [], []>;
+  def int_x86_sse2_pause : GCCBuiltin<"__builtin_ia32_pause">,
+              Intrinsic<[], [], []>;
 }
 
 //===----------------------------------------------------------------------===//

Modified: llvm/trunk/lib/Target/X86/X86InstrSSE.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrSSE.td?rev=195697&r1=195696&r2=195697&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrSSE.td (original)
+++ llvm/trunk/lib/Target/X86/X86InstrSSE.td Mon Nov 25 18:20:43 2013
@@ -3499,7 +3499,9 @@ def CLFLUSH : I<0xAE, MRM7m, (outs), (in
 
 // 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", [], IIC_SSE_PAUSE>, REP;
+def PAUSE : I<0x90, RawFrm, (outs), (ins),  
+              "pause", [(int_x86_sse2_pause)], IIC_SSE_PAUSE>, 
+              REP, Requires<[HasSSE2]>;
 
 // Load, store, and memory fence
 def SFENCE : I<0xAE, MRM_F8, (outs), (ins),

Modified: llvm/trunk/test/CodeGen/X86/sse2-intrinsics-x86.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/sse2-intrinsics-x86.ll?rev=195697&r1=195696&r2=195697&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/sse2-intrinsics-x86.ll (original)
+++ llvm/trunk/test/CodeGen/X86/sse2-intrinsics-x86.ll Mon Nov 25 18:20:43 2013
@@ -710,3 +710,10 @@ define i32 @test_x86_sse2_ucomineq_sd(<2
   ret i32 %res
 }
 declare i32 @llvm.x86.sse2.ucomineq.sd(<2 x double>, <2 x double>) nounwind readnone
+
+define void @test_x86_sse2_pause() {
+  ; CHECK: pause
+  tail call void @llvm.x86.sse2.pause()
+  ret void 
+}
+declare void @llvm.x86.sse2.pause() nounwind