fb3e3ef62e
ValueTracking attempts to match compare+select patterns to FP min/max operations, but it was created before the newer IEEE-754-2019 minimum/maximum ops were defined. Ie, matchSelectPattern() does not account for the -0.0/+0.0 behavior that is specified in the newer standard. FMINIMUM/FMAXIMUM nodes were created to map to the newer standard: /// FMINIMUM/FMAXIMUM - NaN-propagating minimum/maximum that also treat -0.0 /// as less than 0.0. While FMINNUM_IEEE/FMAXNUM_IEEE follow IEEE 754-2008 /// semantics, FMINIMUM/FMAXIMUM follow IEEE 754-2018 draft semantics. We could adjust ValueTracking to deal with signed zero, but it seems like a moot point given the divergent NaN behavior discussed in D143056, so just delete this possibility to avoid bugs when converting IR to SDAG. Differential Revision: https://reviews.llvm.org/D143106
83 lines
2.1 KiB
LLVM
83 lines
2.1 KiB
LLVM
; RUN: llc -mtriple=arm-eabi -mcpu=swift %s -o - | FileCheck %s
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; RUN: llc -mtriple=arm-eabi -mcpu=cortex-a8 -mattr=-neon %s -o -
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define float @fmin_ole(float %x) nounwind {
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;CHECK-LABEL: fmin_ole:
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;CHECK-NOT: vmin.f32
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%cond = fcmp ole float 1.0, %x
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%min1 = select i1 %cond, float 1.0, float %x
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ret float %min1
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}
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define float @fmin_ole_zero(float %x) nounwind {
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;CHECK-LABEL: fmin_ole_zero:
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;CHECK-NOT: vmin.f32
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%cond = fcmp ole float 0.0, %x
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%min1 = select i1 %cond, float 0.0, float %x
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ret float %min1
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}
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define float @fmin_ult(float %x) nounwind {
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;CHECK-LABEL: fmin_ult:
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;CHECK-NOT: vmin.f32
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%cond = fcmp ult float %x, 1.0
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%min1 = select i1 %cond, float %x, float 1.0
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ret float %min1
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}
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define float @fmax_ogt(float %x) nounwind {
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;CHECK-LABEL: fmax_ogt:
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;CHECK-NOT: vmax.f32
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%cond = fcmp ogt float 1.0, %x
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%max1 = select i1 %cond, float 1.0, float %x
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ret float %max1
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}
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define float @fmax_uge(float %x) nounwind {
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;CHECK-LABEL: fmax_uge:
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;CHECK-NOT: vmax.f32
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%cond = fcmp uge float %x, 1.0
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%max1 = select i1 %cond, float %x, float 1.0
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ret float %max1
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}
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define float @fmax_uge_zero(float %x) nounwind {
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;CHECK-LABEL: fmax_uge_zero:
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;CHECK-NOT: vmax.f32
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%cond = fcmp uge float %x, 0.0
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%max1 = select i1 %cond, float %x, float 0.0
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ret float %max1
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}
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define float @fmax_olt_reverse(float %x) nounwind {
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;CHECK-LABEL: fmax_olt_reverse:
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;CHECK-NOT: vmax.f32
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%cond = fcmp olt float %x, 1.0
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%max1 = select i1 %cond, float 1.0, float %x
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ret float %max1
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}
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define float @fmax_ule_reverse(float %x) nounwind {
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;CHECK-LABEL: fmax_ule_reverse:
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;CHECK-NOT: vmax.f32
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%cond = fcmp ult float 1.0, %x
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%max1 = select i1 %cond, float %x, float 1.0
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ret float %max1
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}
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define float @fmin_oge_reverse(float %x) nounwind {
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;CHECK-LABEL: fmin_oge_reverse:
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;CHECK-NOT: vmin.f32
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%cond = fcmp oge float %x, 1.0
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%min1 = select i1 %cond, float 1.0, float %x
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ret float %min1
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}
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define float @fmin_ugt_reverse(float %x) nounwind {
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;CHECK-LABEL: fmin_ugt_reverse:
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;CHECK-NOT: vmin.f32
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%cond = fcmp ugt float 1.0, %x
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%min1 = select i1 %cond, float %x, float 1.0
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ret float %min1
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}
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