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ecd6525b24
The select pattern recognition in ValueTracking (as used by InstCombine and SelectionDAGBuilder) only knew about integer patterns. This teaches it about minimum and maximum operations. matchSelectPattern() has been extended to return a struct containing the existing Flavor and a new enum defining the pattern's behavior when given one NaN operand. C minnum() is defined to return the non-NaN operand in this case, but the idiomatic C "a < b ? a : b" would return the NaN operand. ARM and AArch64 at least have different instructions for these different cases. llvm-svn: 244580
157 lines
4.4 KiB
LLVM
157 lines
4.4 KiB
LLVM
; RUN: opt -S -instcombine < %s | FileCheck %s
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; CHECK-LABEL: @t1
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; CHECK-NEXT: fcmp oge float %a, 5.000000e+00
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; CHECK-NEXT: select i1 %.inv, float 5.000000e+00, float %a
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; CHECK-NEXT: fpext float %1 to double
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define double @t1(float %a) {
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; This is the canonical form for a type-changing min/max.
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%1 = fcmp ult float %a, 5.0
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%2 = select i1 %1, float %a, float 5.0
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%3 = fpext float %2 to double
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ret double %3
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}
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; CHECK-LABEL: @t2
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; CHECK-NEXT: fcmp oge float %a, 5.000000e+00
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; CHECK-NEXT: select i1 %.inv, float 5.000000e+00, float %a
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; CHECK-NEXT: fpext float %1 to double
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define double @t2(float %a) {
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; Check this is converted into canonical form, as above.
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%1 = fcmp ult float %a, 5.0
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%2 = fpext float %a to double
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%3 = select i1 %1, double %2, double 5.0
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ret double %3
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}
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; CHECK-LABEL: @t4
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; CHECK-NEXT: fcmp oge double %a, 5.000000e+00
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; CHECK-NEXT: select i1 %.inv, double 5.000000e+00, double %a
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; CHECK-NEXT: fptrunc double %1 to float
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define float @t4(double %a) {
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; Same again, with trunc.
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%1 = fcmp ult double %a, 5.0
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%2 = fptrunc double %a to float
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%3 = select i1 %1, float %2, float 5.0
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ret float %3
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}
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; CHECK-LABEL: @t5
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; CHECK-NEXT: fcmp ult float %a, 5.000000e+00
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; CHECK-NEXT: fpext float %a to double
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; CHECK-NEXT: select i1 %1, double %2, double 5.001
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define double @t5(float %a) {
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; different values, should not be converted.
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%1 = fcmp ult float %a, 5.0
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%2 = fpext float %a to double
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%3 = select i1 %1, double %2, double 5.001
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ret double %3
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}
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; CHECK-LABEL: @t6
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; CHECK-NEXT: fcmp ult float %a, -0.0
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; CHECK-NEXT: fpext float %a to double
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; CHECK-NEXT: select i1 %1, double %2, double 0.0
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define double @t6(float %a) {
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; Signed zero, should not be converted
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%1 = fcmp ult float %a, -0.0
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%2 = fpext float %a to double
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%3 = select i1 %1, double %2, double 0.0
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ret double %3
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}
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; CHECK-LABEL: @t7
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; CHECK-NEXT: fcmp ult float %a, 0.0
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; CHECK-NEXT: fpext float %a to double
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; CHECK-NEXT: select i1 %1, double %2, double -0.0
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define double @t7(float %a) {
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; Signed zero, should not be converted
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%1 = fcmp ult float %a, 0.0
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%2 = fpext float %a to double
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%3 = select i1 %1, double %2, double -0.0
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ret double %3
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}
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; CHECK-LABEL: @t8
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; CHECK-NEXT: fcmp oge float %a, 5.000000e+00
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; CHECK-NEXT: select i1 %.inv, float 5.000000e+00, float %a
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; CHECK-NEXT: fptoui float %1 to i64
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define i64 @t8(float %a) {
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%1 = fcmp ult float %a, 5.0
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%2 = fptoui float %a to i64
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%3 = select i1 %1, i64 %2, i64 5
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ret i64 %3
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}
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; CHECK-LABEL: @t9
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; CHECK-NEXT: fcmp oge float %a, 0.000000e+00
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; CHECK-NEXT: select i1 %.inv, float 0.000000e+00, float %a
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; CHECK-NEXT: fptosi float %1 to i8
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define i8 @t9(float %a) {
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%1 = fcmp ult float %a, 0.0
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%2 = fptosi float %a to i8
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%3 = select i1 %1, i8 %2, i8 0
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ret i8 %3
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}
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; CHECK-LABEL: @t11
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; CHECK-NEXT: fcmp fast oge float %b, %a
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; CHECK-NEXT: select i1 %.inv, float %a, float %b
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; CHECK-NEXT: fptosi
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define i8 @t11(float %a, float %b) {
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; Either operand could be NaN, but fast modifier applied.
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%1 = fcmp fast ult float %b, %a
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%2 = fptosi float %a to i8
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%3 = fptosi float %b to i8
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%4 = select i1 %1, i8 %3, i8 %2
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ret i8 %4
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}
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; CHECK-LABEL: @t12
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; CHECK-NEXT: fcmp nnan oge float %b, %a
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; CHECK-NEXT: select i1 %.inv, float %a, float %b
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; CHECK-NEXT: fptosi float %.v to i8
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define i8 @t12(float %a, float %b) {
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; Either operand could be NaN, but nnan modifier applied.
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%1 = fcmp nnan ult float %b, %a
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%2 = fptosi float %a to i8
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%3 = fptosi float %b to i8
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%4 = select i1 %1, i8 %3, i8 %2
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ret i8 %4
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}
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; CHECK-LABEL: @t13
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; CHECK-NEXT: fcmp ult float %a, 1.500000e+00
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; CHECK-NEXT: fptosi float %a to i8
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; CHECK-NEXT: select i1 %1, i8 %2, i8 1
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define i8 @t13(float %a) {
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; Float and int values do not match.
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%1 = fcmp ult float %a, 1.5
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%2 = fptosi float %a to i8
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%3 = select i1 %1, i8 %2, i8 1
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ret i8 %3
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}
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; CHECK-LABEL: @t14
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; CHECK-NEXT: fcmp ule float %a, 0.000000e+00
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; CHECK-NEXT: fptosi float %a to i8
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; CHECK-NEXT: select i1 %1, i8 %2, i8 0
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define i8 @t14(float %a) {
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; <= comparison, where %a could be -0.0. Not safe.
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%1 = fcmp ule float %a, 0.0
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%2 = fptosi float %a to i8
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%3 = select i1 %1, i8 %2, i8 0
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ret i8 %3
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}
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; CHECK-LABEL: @t15
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; CHECK-NEXT: fcmp nsz oge float %a, 0.000000e+00
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; CHECK-NEXT: select i1 %.inv, float 0.000000e+00, float %a
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; CHECK-NEXT: fptosi float %1 to i8
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define i8 @t15(float %a) {
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%1 = fcmp nsz ule float %a, 0.0
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%2 = fptosi float %a to i8
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%3 = select i1 %1, i8 %2, i8 0
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ret i8 %3
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}
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