// 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 {
--- /dev/null
+; 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