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a32d396d60
This change improves EmitLoweredSelect() so that multiple contiguous CMOV pseudo instructions with the same (or exactly opposite) conditions get lowered using a single new basic-block. This eliminates unnecessary extra basic-blocks (and CFG merge points) when contiguous CMOVs are being lowered. Patch by: kevin.b.smith@intel.com Differential Revision: http://reviews.llvm.org/D11428 llvm-svn: 244202
40 lines
1.3 KiB
LLVM
40 lines
1.3 KiB
LLVM
; RUN: llc < %s -mtriple=i386-linux-gnu -mattr=+sse2 -o - | FileCheck %s
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; RUN: llc < %s -mtriple=x86_64-linux-gnu -o - | FileCheck %s
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; This test checks that only a single jae gets generated in the final code
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; for lowering the CMOV pseudos that get created for this IR.
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; CHECK-LABEL: foo1:
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; CHECK: jae
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; CHECK-NOT: jae
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define double @foo1(float %p1, double %p2, double %p3) nounwind {
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entry:
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%c1 = fcmp oge float %p1, 0.000000e+00
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%d0 = fadd double %p2, 1.25e0
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%d1 = fadd double %p3, 1.25e0
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%d2 = select i1 %c1, double %d0, double %d1
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%d3 = select i1 %c1, double %d0, double %p2
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%d4 = select i1 %c1, double %p3, double %d1
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%d5 = fsub double %d2, %d3
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%d6 = fadd double %d5, %d4
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ret double %d6
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}
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; This test checks that only a single jae gets generated in the final code
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; for lowering the CMOV pseudos that get created for this IR.
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; CHECK-LABEL: foo2:
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; CHECK: jae
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; CHECK-NOT: jae
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define float @foo2(float %p1, float %p2, float %p3) nounwind {
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entry:
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%c1 = fcmp oge float %p1, 0.000000e+00
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%d0 = fadd float %p2, 1.25e0
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%d1 = fadd float %p3, 1.25e0
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%d2 = select i1 %c1, float %d0, float %d1
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%d3 = select i1 %c1, float %d1, float %p2
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%d4 = select i1 %c1, float %d0, float %p3
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%d5 = fsub float %d2, %d3
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%d6 = fadd float %d5, %d4
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ret float %d6
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}
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