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https://github.com/RPCS3/llvm-mirror.git
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b63d80b374
This is a preliminary step for the patch discussed in D41136 (and denoted here with the FIXME comment). When we match an FP min/max that is cast to integer, any intermediate difference between +0.0 or -0.0 should be muted in the result by the conversion (either fptosi or fptoui) of the result. Thus, we can enable 'nsz' for the purpose of matching fmin/fmax. Note that there's probably room to generalize this more, possibly by fixing the current calls to the weak version of isKnownNonZero() in matchSelectPattern() to the more powerful recursive version. Differential Revision: https://reviews.llvm.org/D41333 llvm-svn: 321456
224 lines
7.1 KiB
LLVM
224 lines
7.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -instcombine < %s | FileCheck %s
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; This is the canonical form for a type-changing min/max.
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define double @t1(float %a) {
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; CHECK-LABEL: @t1(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp oge float %a, 5.000000e+00
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[DOTINV]], float 5.000000e+00, float %a
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; CHECK-NEXT: [[TMP2:%.*]] = fpext float [[TMP1]] to double
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; CHECK-NEXT: ret double [[TMP2]]
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;
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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 this is converted into canonical form, as above.
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define double @t2(float %a) {
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; CHECK-LABEL: @t2(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp oge float %a, 5.000000e+00
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[DOTINV]], float 5.000000e+00, float %a
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; CHECK-NEXT: [[TMP2:%.*]] = fpext float [[TMP1]] to double
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; CHECK-NEXT: ret double [[TMP2]]
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;
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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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; Same again, with trunc.
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define float @t4(double %a) {
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; CHECK-LABEL: @t4(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp oge double %a, 5.000000e+00
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[DOTINV]], double 5.000000e+00, double %a
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; CHECK-NEXT: [[TMP2:%.*]] = fptrunc double [[TMP1]] to float
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; CHECK-NEXT: ret float [[TMP2]]
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;
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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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; different values, should not be converted.
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define double @t5(float %a) {
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; CHECK-LABEL: @t5(
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; CHECK-NEXT: [[TMP1:%.*]] = fcmp ult float %a, 5.000000e+00
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; CHECK-NEXT: [[TMP2:%.*]] = fpext float %a to double
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; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP1]], double [[TMP2]], double 5.001000e+00
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; CHECK-NEXT: ret double [[TMP3]]
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;
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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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; Signed zero, should not be converted
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define double @t6(float %a) {
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; CHECK-LABEL: @t6(
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; CHECK-NEXT: [[TMP1:%.*]] = fcmp ult float %a, -0.000000e+00
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; CHECK-NEXT: [[TMP2:%.*]] = fpext float %a to double
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; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP1]], double [[TMP2]], double 0.000000e+00
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; CHECK-NEXT: ret double [[TMP3]]
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;
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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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; Signed zero, should not be converted
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define double @t7(float %a) {
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; CHECK-LABEL: @t7(
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; CHECK-NEXT: [[TMP1:%.*]] = fcmp ult float %a, 0.000000e+00
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; CHECK-NEXT: [[TMP2:%.*]] = fpext float %a to double
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; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP1]], double [[TMP2]], double -0.000000e+00
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; CHECK-NEXT: ret double [[TMP3]]
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;
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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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define i64 @t8(float %a) {
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; CHECK-LABEL: @t8(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp oge float %a, 5.000000e+00
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[DOTINV]], float 5.000000e+00, float %a
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; CHECK-NEXT: [[TMP2:%.*]] = fptoui float [[TMP1]] to i64
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; CHECK-NEXT: ret i64 [[TMP2]]
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;
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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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define i8 @t9(float %a) {
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; CHECK-LABEL: @t9(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp oge float %a, 0.000000e+00
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[DOTINV]], float 0.000000e+00, float %a
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; CHECK-NEXT: [[TMP2:%.*]] = fptosi float [[TMP1]] to i8
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; CHECK-NEXT: ret i8 [[TMP2]]
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;
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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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; Either operand could be NaN, but fast modifier applied.
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define i8 @t11(float %a, float %b) {
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; CHECK-LABEL: @t11(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp fast oge float %b, %a
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; CHECK-NEXT: [[DOTV:%.*]] = select i1 [[DOTINV]], float %a, float %b
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; CHECK-NEXT: [[TMP1:%.*]] = fptosi float [[DOTV]] to i8
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; CHECK-NEXT: ret i8 [[TMP1]]
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;
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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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; Either operand could be NaN, but nnan modifier applied.
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define i8 @t12(float %a, float %b) {
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; CHECK-LABEL: @t12(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp nnan oge float %b, %a
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; CHECK-NEXT: [[DOTV:%.*]] = select i1 [[DOTINV]], float %a, float %b
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; CHECK-NEXT: [[TMP1:%.*]] = fptosi float [[DOTV]] to i8
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; CHECK-NEXT: ret i8 [[TMP1]]
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;
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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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; Float and int values do not match.
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define i8 @t13(float %a) {
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; CHECK-LABEL: @t13(
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; CHECK-NEXT: [[TMP1:%.*]] = fcmp ult float %a, 1.500000e+00
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; CHECK-NEXT: [[TMP2:%.*]] = fptosi float %a to i8
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; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP1]], i8 [[TMP2]], i8 1
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; CHECK-NEXT: ret i8 [[TMP3]]
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;
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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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; %a could be -0.0, but it doesn't matter because the conversion to int is the same for 0.0 or -0.0.
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define i8 @t14(float %a) {
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; CHECK-LABEL: @t14(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp oge float %a, 0.000000e+00
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[DOTINV]], float 0.000000e+00, float %a
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; CHECK-NEXT: [[TMP2:%.*]] = fptosi float [[TMP1]] to i8
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; CHECK-NEXT: ret i8 [[TMP2]]
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;
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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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define i8 @t14_commute(float %a) {
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; CHECK-LABEL: @t14_commute(
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; CHECK-NEXT: [[TMP1:%.*]] = fcmp ogt float %a, 0.000000e+00
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; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], float %a, float 0.000000e+00
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; CHECK-NEXT: [[TMP3:%.*]] = fptosi float [[TMP2]] to i8
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; CHECK-NEXT: ret i8 [[TMP3]]
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;
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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 0, i8 %2
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ret i8 %3
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}
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define i8 @t15(float %a) {
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; CHECK-LABEL: @t15(
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; CHECK-NEXT: [[DOTINV:%.*]] = fcmp nsz oge float %a, 0.000000e+00
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[DOTINV]], float 0.000000e+00, float %a
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; CHECK-NEXT: [[TMP2:%.*]] = fptosi float [[TMP1]] to i8
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; CHECK-NEXT: ret i8 [[TMP2]]
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;
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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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define double @t16(i32 %x) {
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; CHECK-LABEL: @t16(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 %x, 0
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; CHECK-NEXT: [[CST:%.*]] = sitofp i32 %x to double
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], double [[CST]], double 5.000000e-01
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; CHECK-NEXT: ret double [[SEL]]
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;
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%cmp = icmp sgt i32 %x, 0
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%cst = sitofp i32 %x to double
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%sel = select i1 %cmp, double %cst, double 5.000000e-01
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ret double %sel
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}
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define double @t17(i32 %x) {
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; CHECK-LABEL: @t17(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i32 %x, 2
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; CHECK-NEXT: [[SEL1:%.*]] = select i1 [[TMP1]], i32 %x, i32 2
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; CHECK-NEXT: [[TMP2:%.*]] = sitofp i32 [[SEL1]] to double
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%cmp = icmp sgt i32 %x, 2
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%cst = sitofp i32 %x to double
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%sel = select i1 %cmp, double %cst, double 2.0
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ret double %sel
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}
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