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Use MOVSSmr instead of EXTRACTPSmr in the case of extracting
vector element 0 for a store, as it's smaller and faster. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58483 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4194,11 +4194,15 @@ X86TargetLowering::LowerEXTRACT_VECTOR_ELT_SSE4(SDValue Op,
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} else if (VT == MVT::f32) {
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// EXTRACTPS outputs to a GPR32 register which will require a movd to copy
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// the result back to FR32 register. It's only worth matching if the
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// result has a single use which is a store or a bitcast to i32.
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// result has a single use which is a store or a bitcast to i32. And in
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// the case of a store, it's not worth it if the index is a constant 0,
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// because a MOVSSmr can be used instead, which is smaller and faster.
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if (!Op.hasOneUse())
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return SDValue();
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SDNode *User = *Op.getNode()->use_begin();
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if (User->getOpcode() != ISD::STORE &&
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if ((User->getOpcode() != ISD::STORE ||
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(isa<ConstantSDNode>(Op.getOperand(1)) &&
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cast<ConstantSDNode>(Op.getOperand(1))->isNullValue())) &&
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(User->getOpcode() != ISD::BIT_CONVERT ||
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User->getValueType(0) != MVT::i32))
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return SDValue();
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@ -1,7 +1,7 @@
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; RUN: llvm-as < %s | llc -march=x86 -mcpu=penryn > %t
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; RUN: not grep movd %t
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; RUN: not grep movss %t
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; RUN: grep {extractps \\\$0, %xmm0, } %t
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; RUN: grep {movss %xmm} %t | count 1
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; RUN: grep {extractps \\\$1, %xmm0, } %t | count 1
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; PR2647
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external global float, align 16 ; <float*>:0 [#uses=2]
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@ -14,6 +14,14 @@ define internal void @""() nounwind {
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store float %4, float* @0, align 16
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ret void
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}
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define internal void @""() nounwind {
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load float* @0, align 16 ; <float>:1 [#uses=1]
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insertelement <4 x float> undef, float %1, i32 1 ; <<4 x float>>:2 [#uses=1]
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call <4 x float> @llvm.x86.sse.rsqrt.ss( <4 x float> %2 ) ; <<4 x float>>:3 [#uses=1]
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extractelement <4 x float> %3, i32 1 ; <float>:4 [#uses=1]
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store float %4, float* @0, align 16
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ret void
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}
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declare <4 x float> @llvm.x86.sse.rsqrt.ss(<4 x float>) nounwind readnone
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