X86: Turn fp selects into mask operations.

double test(double a, double b, double c, double d) { return a<b ? c : d; }

before:
_test:
	ucomisd	%xmm0, %xmm1
	ja	LBB0_2
	movaps	%xmm3, %xmm2
LBB0_2:
	movaps	%xmm2, %xmm0

after:
_test:
	cmpltsd	%xmm1, %xmm0
	andpd	%xmm0, %xmm2
	andnpd	%xmm3, %xmm0
	orpd	%xmm2, %xmm0

Small speedup on Benchmarks/SmallPT

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187706 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 185 insertions, 0 deletions

diff --git a/test/CodeGen/X86/fp-select-cmp-and.ll b/test/CodeGen/X86/fp-select-cmp-and.ll
new file mode 100644
index 0000000000..cc76b43e87
--- /dev/null
+++ b/test/CodeGen/X86/fp-select-cmp-and.ll
@@ -0,0 +1,185 @@
+; RUN: llc < %s -march=x86-64 -mtriple=x86_64-apple-darwin -mcpu=nehalem | FileCheck %s
+
+define double @test1(double %a, double %b, double %eps) {
+  %cmp = fcmp olt double %a, %eps
+  %cond = select i1 %cmp, double %b, double 0.000000e+00
+  ret double %cond
+
+; CHECK-LABEL: @test1
+; CHECK:	cmpltsd	%xmm2, %xmm0
+; CHECK-NEXT:	andpd	%xmm1, %xmm0
+}
+
+define double @test2(double %a, double %b, double %eps) {
+  %cmp = fcmp ole double %a, %eps
+  %cond = select i1 %cmp, double %b, double 0.000000e+00
+  ret double %cond
+
+; CHECK-LABEL: @test2
+; CHECK:	cmplesd	%xmm2, %xmm0
+; CHECK-NEXT:	andpd	%xmm1, %xmm0
+}
+
+define double @test3(double %a, double %b, double %eps) {
+  %cmp = fcmp ogt double %a, %eps
+  %cond = select i1 %cmp, double %b, double 0.000000e+00
+  ret double %cond
+
+; CHECK-LABEL: @test3
+; CHECK:	cmpltsd	%xmm0, %xmm2
+; CHECK-NEXT:	andpd	%xmm1, %xmm2
+}
+
+define double @test4(double %a, double %b, double %eps) {
+  %cmp = fcmp oge double %a, %eps
+  %cond = select i1 %cmp, double %b, double 0.000000e+00
+  ret double %cond
+
+; CHECK-LABEL: @test4
+; CHECK:	cmplesd	%xmm0, %xmm2
+; CHECK-NEXT:	andpd	%xmm1, %xmm2
+}
+
+define double @test5(double %a, double %b, double %eps) {
+  %cmp = fcmp olt double %a, %eps
+  %cond = select i1 %cmp, double 0.000000e+00, double %b
+  ret double %cond
+
+; CHECK-LABEL: @test5
+; CHECK:	cmpltsd	%xmm2, %xmm0
+; CHECK-NEXT:	andnpd	%xmm1, %xmm0
+}
+
+define double @test6(double %a, double %b, double %eps) {
+  %cmp = fcmp ole double %a, %eps
+  %cond = select i1 %cmp, double 0.000000e+00, double %b
+  ret double %cond
+
+; CHECK-LABEL: @test6
+; CHECK:	cmplesd	%xmm2, %xmm0
+; CHECK-NEXT:	andnpd	%xmm1, %xmm0
+}
+
+define double @test7(double %a, double %b, double %eps) {
+  %cmp = fcmp ogt double %a, %eps
+  %cond = select i1 %cmp, double 0.000000e+00, double %b
+  ret double %cond
+
+; CHECK-LABEL: @test7
+; CHECK:	cmpltsd	%xmm0, %xmm2
+; CHECK-NEXT:	andnpd	%xmm1, %xmm2
+}
+
+define double @test8(double %a, double %b, double %eps) {
+  %cmp = fcmp oge double %a, %eps
+  %cond = select i1 %cmp, double 0.000000e+00, double %b
+  ret double %cond
+
+; CHECK-LABEL: @test8
+; CHECK:	cmplesd	%xmm0, %xmm2
+; CHECK-NEXT:	andnpd	%xmm1, %xmm2
+}
+
+define float @test9(float %a, float %b, float %eps) {
+  %cmp = fcmp olt float %a, %eps
+  %cond = select i1 %cmp, float %b, float 0.000000e+00
+  ret float %cond
+
+; CHECK-LABEL: @test9
+; CHECK:	cmpltss	%xmm2, %xmm0
+; CHECK-NEXT:	andps	%xmm1, %xmm0
+}
+
+define float @test10(float %a, float %b, float %eps) {
+  %cmp = fcmp ole float %a, %eps
+  %cond = select i1 %cmp, float %b, float 0.000000e+00
+  ret float %cond
+
+; CHECK-LABEL: @test10
+; CHECK:	cmpless	%xmm2, %xmm0
+; CHECK-NEXT:	andps	%xmm1, %xmm0
+}
+
+define float @test11(float %a, float %b, float %eps) {
+  %cmp = fcmp ogt float %a, %eps
+  %cond = select i1 %cmp, float %b, float 0.000000e+00
+  ret float %cond
+
+; CHECK-LABEL: @test11
+; CHECK:	cmpltss	%xmm0, %xmm2
+; CHECK-NEXT:	andps	%xmm1, %xmm2
+}
+
+define float @test12(float %a, float %b, float %eps) {
+  %cmp = fcmp oge float %a, %eps
+  %cond = select i1 %cmp, float %b, float 0.000000e+00
+  ret float %cond
+
+; CHECK-LABEL: @test12
+; CHECK:	cmpless	%xmm0, %xmm2
+; CHECK-NEXT:	andps	%xmm1, %xmm2
+}
+
+define float @test13(float %a, float %b, float %eps) {
+  %cmp = fcmp olt float %a, %eps
+  %cond = select i1 %cmp, float 0.000000e+00, float %b
+  ret float %cond
+
+; CHECK-LABEL: @test13
+; CHECK:	cmpltss	%xmm2, %xmm0
+; CHECK-NEXT:	andnps	%xmm1, %xmm0
+}
+
+define float @test14(float %a, float %b, float %eps) {
+  %cmp = fcmp ole float %a, %eps
+  %cond = select i1 %cmp, float 0.000000e+00, float %b
+  ret float %cond
+
+; CHECK-LABEL: @test14
+; CHECK:	cmpless	%xmm2, %xmm0
+; CHECK-NEXT:	andnps	%xmm1, %xmm0
+}
+
+define float @test15(float %a, float %b, float %eps) {
+  %cmp = fcmp ogt float %a, %eps
+  %cond = select i1 %cmp, float 0.000000e+00, float %b
+  ret float %cond
+
+; CHECK-LABEL: @test15
+; CHECK:	cmpltss	%xmm0, %xmm2
+; CHECK-NEXT:	andnps	%xmm1, %xmm2
+}
+
+define float @test16(float %a, float %b, float %eps) {
+  %cmp = fcmp oge float %a, %eps
+  %cond = select i1 %cmp, float 0.000000e+00, float %b
+  ret float %cond
+
+; CHECK-LABEL: @test16
+; CHECK:	cmpless	%xmm0, %xmm2
+; CHECK-NEXT:	andnps	%xmm1, %xmm2
+}
+
+define float @test17(float %a, float %b, float %c, float %eps) {
+  %cmp = fcmp oge float %a, %eps
+  %cond = select i1 %cmp, float %c, float %b
+  ret float %cond
+
+; CHECK-LABEL: @test17
+; CHECK: cmpless	%xmm0, %xmm3
+; CHECK-NEXT: andps	%xmm3, %xmm2
+; CHECK-NEXT: andnps	%xmm1, %xmm3
+; CHECK-NEXT: orps	%xmm2, %xmm3
+}
+
+define double @test18(double %a, double %b, double %c, double %eps) {
+  %cmp = fcmp oge double %a, %eps
+  %cond = select i1 %cmp, double %c, double %b
+  ret double %cond
+
+; CHECK-LABEL: @test18
+; CHECK: cmplesd	%xmm0, %xmm3
+; CHECK-NEXT: andpd	%xmm3, %xmm2
+; CHECK-NEXT: andnpd	%xmm1, %xmm3
+; CHECK-NEXT: orpd	%xmm2, %xmm3
+}