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807360ab08
Handle the poor codegen for i64/x86xmm->v2i64 (%mm -> %xmm) moves. Instead of using stack store/load pair to do the job, use scalar_to_vector directly, which in the MMX case can use movq2dq. This was the current behavior prior to improvements for vector legalization of extloads in r213897. This commit fixes the regression and as a side-effect also remove some unnecessary shuffles. In the new attached testcase, we go from: pshufw $-18, (%rdi), %mm0 movq %mm0, -8(%rsp) movq -8(%rsp), %xmm0 pshufd $-44, %xmm0, %xmm0 movd %xmm0, %eax ... To: pshufw $-18, (%rdi), %mm0 movq2dq %mm0, %xmm0 movd %xmm0, %eax ... Differential Revision: http://reviews.llvm.org/D7126 rdar://problem/19413324 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226953 91177308-0d34-0410-b5e6-96231b3b80d8
16 lines
446 B
LLVM
16 lines
446 B
LLVM
; RUN: llc < %s -march=x86-64 -mcpu=corei7 -mtriple=x86_64-pc-win32 | FileCheck %s
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; CHECK-LABEL: vcast:
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define <2 x i32> @vcast(<2 x float> %a, <2 x float> %b) {
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; CHECK-NOT: pmovzxdq
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; CHECK-NOT: pmovzxdq
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; CHECK: movdqa (%{{.*}}), %[[R0:xmm[0-9]+]]
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%af = bitcast <2 x float> %a to <2 x i32>
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%bf = bitcast <2 x float> %b to <2 x i32>
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; CHECK-NEXT: psubq (%{{.*}}), %[[R0]]
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%x = sub <2 x i32> %af, %bf
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; CHECK: ret
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ret <2 x i32> %x
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}
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