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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
101 lines
3.6 KiB
LLVM
101 lines
3.6 KiB
LLVM
; 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. The tricky part
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; of this test is that it tests the special PHI operand rewriting code in
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; X86TargetLowering::EmitLoweredSelect.
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;
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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 %d2, double %p2
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%d4 = select i1 %c1, double %d3, double %p3
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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. The tricky part
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; of this test is that it tests the special PHI operand rewriting code in
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; X86TargetLowering::EmitLoweredSelect.
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;
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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 double @foo2(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 %p2, double %d2
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%d4 = select i1 %c1, double %p3, double %d3
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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 js gets generated in the final code
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; for lowering the CMOV pseudos that get created for this IR. The tricky part
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; of this test is that it tests the special PHI operand rewriting code in
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; X86TargetLowering::EmitLoweredSelect. It also tests to make sure all
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; the operands of the resulting instructions are from the proper places.
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;
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; CHECK-LABEL: foo3:
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; CHECK: js
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; CHECK-NOT: js
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; CHECK-LABEL: # BB#1:
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; CHECK-DAG: movapd %xmm2, %xmm1
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; CHECK-DAG: movapd %xmm2, %xmm0
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; CHECK-LABEL:.LBB2_2:
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; CHECK: divsd %xmm1, %xmm0
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; CHECK: ret
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define double @foo3(i32 %p1, double %p2, double %p3,
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double %p4, double %p5) nounwind {
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entry:
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%c1 = icmp slt i32 %p1, 0
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%d2 = select i1 %c1, double %p2, double %p3
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%d3 = select i1 %c1, double %p3, double %p4
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%d4 = select i1 %c1, double %d2, double %d3
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%d5 = fdiv double %d4, %d3
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ret double %d5
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}
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; This test checks that only a single js gets generated in the final code
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; for lowering the CMOV pseudos that get created for this IR. The tricky part
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; of this test is that it tests the special PHI operand rewriting code in
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; X86TargetLowering::EmitLoweredSelect. It also tests to make sure all
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; the operands of the resulting instructions are from the proper places
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; when the "opposite condition" handling code in the compiler is used.
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; This should be the same code as foo3 above, because we use the opposite
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; condition code in the second two selects, but we also swap the operands
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; of the selects to give the same actual computation.
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;
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; CHECK-LABEL: foo4:
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; CHECK: js
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; CHECK-NOT: js
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; CHECK-LABEL: # BB#1:
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; CHECK-DAG: movapd %xmm2, %xmm1
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; CHECK-DAG: movapd %xmm2, %xmm0
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; CHECK-LABEL:.LBB3_2:
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; CHECK: divsd %xmm1, %xmm0
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; CHECK: ret
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define double @foo4(i32 %p1, double %p2, double %p3,
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double %p4, double %p5) nounwind {
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entry:
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%c1 = icmp slt i32 %p1, 0
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%d2 = select i1 %c1, double %p2, double %p3
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%c2 = icmp sge i32 %p1, 0
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%d3 = select i1 %c2, double %p4, double %p3
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%d4 = select i1 %c2, double %d3, double %d2
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%d5 = fdiv double %d4, %d3
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ret double %d5
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}
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