Add an intrinsic for the SSE2 PAUSE instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195697 91177308-0d34-0410-b5e6-96231b3b80d8
stryku · Nov 26, 2013 · 0e6ec12 · 0e6ec12
1 parent 0487c74
commit 0e6ec12
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Showing 3 changed files with 12 additions and 1 deletion.
diff --git a/include/llvm/IR/IntrinsicsX86.td b/include/llvm/IR/IntrinsicsX86.td
@@ -536,6 +536,8 @@ let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
               Intrinsic<[], [], []>;
   def int_x86_sse2_mfence : GCCBuiltin<"__builtin_ia32_mfence">,
               Intrinsic<[], [], []>;
+  def int_x86_sse2_pause : GCCBuiltin<"__builtin_ia32_pause">,
+              Intrinsic<[], [], []>;
 }
 
 //===----------------------------------------------------------------------===//

diff --git a/lib/Target/X86/X86InstrSSE.td b/lib/Target/X86/X86InstrSSE.td
@@ -3499,7 +3499,9 @@ def CLFLUSH : I<0xAE, MRM7m, (outs), (ins i8mem:$src),
 
 // 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),

diff --git a/test/CodeGen/X86/sse2-intrinsics-x86.ll b/test/CodeGen/X86/sse2-intrinsics-x86.ll
@@ -710,3 +710,10 @@ define i32 @test_x86_sse2_ucomineq_sd(<2 x double> %a0, <2 x double> %a1) {
   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