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[ConstantFolding] Expand folding of some library functions

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Expanding the folding of `nearbyint()`, `rint()` and `trunc()` to library
functions, in addition to the current support for intrinsics.

Differential revision: https://reviews.llvm.org/D67468

llvm-svn: 371774
This commit is contained in:
Evandro Menezes 2019-09-12 21:23:22 +00:00
parent 3de03a4c3d
commit 3b3c47e0cc
4 changed files with 245 additions and 10 deletions
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25
lib/Analysis/ConstantFolding.cpp
View File

@ -1491,17 +1491,21 @@ bool llvm::canConstantFoldCallTo(const CallBase *Call, const Function *F) {
case 'l':
return Name == "log" || Name == "logf" ||
Name == "log10" || Name == "log10f";
case 'n':
return Name == "nearbyint" || Name == "nearbyintf";
case 'p':
return Name == "pow" || Name == "powf";
case 'r':
return Name == "round" || Name == "roundf";
return Name == "rint" || Name == "rintf" ||
Name == "round" || Name == "roundf";
case 's':
return Name == "sin" || Name == "sinf" ||
Name == "sinh" || Name == "sinhf" ||
Name == "sqrt" || Name == "sqrtf";
case 't':
return Name == "tan" || Name == "tanf" ||
Name == "tanh" || Name == "tanhf";
Name == "tanh" || Name == "tanhf" ||
Name == "trunc" || Name == "truncf";
case '_':
// Check for various function names that get used for the math functions
// when the header files are preprocessed with the macro
@ -1863,7 +1867,6 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
break;
case LibFunc_log:
case LibFunc_logf:
case LibFunc_log_finite:
case LibFunc_logf_finite:
if (V > 0.0 && TLI->has(Func))
@ -1877,6 +1880,15 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
// TODO: What about hosts that lack a C99 library?
return ConstantFoldFP(log10, V, Ty);
break;
case LibFunc_nearbyint:
case LibFunc_nearbyintf:
case LibFunc_rint:
case LibFunc_rintf:
if (TLI->has(Func)) {
U.roundToIntegral(APFloat::rmNearestTiesToEven);
return ConstantFP::get(Ty->getContext(), U);
}
break;
case LibFunc_round:
case LibFunc_roundf:
if (TLI->has(Func)) {
@ -1911,6 +1923,13 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
if (TLI->has(Func))
return ConstantFoldFP(tanh, V, Ty);
break;
case LibFunc_trunc:
case LibFunc_truncf:
if (TLI->has(Func)) {
U.roundToIntegral(APFloat::rmTowardZero);
return ConstantFP::get(Ty->getContext(), U);
}
break;
}
return nullptr;
}

109
test/Analysis/ConstantFolding/rint.ll Normal file
View File

@ -0,0 +1,109 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -early-cse < %s | FileCheck %s
declare float @nearbyintf(float) #0
declare float @llvm.nearbyint.f32(float) #0
declare double @nearbyint(double) #0
declare double @llvm.nearbyint.f64(double) #0
declare float @rintf(float) #0
declare float @llvm.rint.f32(float) #0
declare double @rint(double) #0
declare double @llvm.rint.f64(double) #0
define float @constant_fold_rint_f32_01() #0 {
; CHECK-LABEL: @constant_fold_rint_f32_01(
; CHECK-NEXT: ret float 1.000000e+00
;
%x = call float @nearbyintf(float 1.25) #0
ret float %x
}
define float @constant_fold_rint_f32_02() #0 {
; CHECK-LABEL: @constant_fold_rint_f32_02(
; CHECK-NEXT: ret float -1.000000e+00
;
%x = call float @llvm.nearbyint.f32(float -1.25) #0
ret float %x
}
define float @constant_fold_rint_f32_03() #0 {
; CHECK-LABEL: @constant_fold_rint_f32_03(
; CHECK-NEXT: ret float 2.000000e+00
;
%x = call float @rintf(float 1.5) #0
ret float %x
}
define float @constant_fold_rint_f32_04() #0 {
; CHECK-LABEL: @constant_fold_rint_f32_04(
; CHECK-NEXT: ret float -2.000000e+00
;
%x = call float @llvm.rint.f32(float -1.5) #0
ret float %x
}
define float @constant_fold_rint_f32_05() #0 {
; CHECK-LABEL: @constant_fold_rint_f32_05(
; CHECK-NEXT: ret float 3.000000e+00
;
%x = call float @nearbyintf(float 2.75) #0
ret float %x
}
define float @constant_fold_rint_f32_06() #0 {
; CHECK-LABEL: @constant_fold_rint_f32_06(
; CHECK-NEXT: ret float -3.000000e+00
;
%x = call float @llvm.nearbyint.f32(float -2.75) #0
ret float %x
}
define double @constant_fold_rint_f64_01() #0 {
; CHECK-LABEL: @constant_fold_rint_f64_01(
; CHECK-NEXT: ret double 1.000000e+00
;
%x = call double @rint(double 1.3) #0
ret double %x
}
define double @constant_fold_rint_f64_02() #0 {
; CHECK-LABEL: @constant_fold_rint_f64_02(
; CHECK-NEXT: ret double -1.000000e+00
;
%x = call double @llvm.rint.f64(double -1.3) #0
ret double %x
}
define double @constant_fold_rint_f64_03() #0 {
; CHECK-LABEL: @constant_fold_rint_f64_03(
; CHECK-NEXT: ret double 2.000000e+00
;
%x = call double @nearbyint(double 1.5) #0
ret double %x
}
define double @constant_fold_rint_f64_04() #0 {
; CHECK-LABEL: @constant_fold_rint_f64_04(
; CHECK-NEXT: ret double -2.000000e+00
;
%x = call double @llvm.nearbyint.f64(double -1.5) #0
ret double %x
}
define double @constant_fold_rint_f64_05() #0 {
; CHECK-LABEL: @constant_fold_rint_f64_05(
; CHECK-NEXT: ret double 3.000000e+00
;
%x = call double @rint(double 2.7) #0
ret double %x
}
define double @constant_fold_rint_f64_06() #0 {
; CHECK-LABEL: @constant_fold_rint_f64_06(
; CHECK-NEXT: ret double -3.000000e+00
;
%x = call double @llvm.rint.f64(double -2.7) #0
ret double %x
}
attributes #0 = { nounwind readnone }

16
test/Transforms/InstCombine/round.ll → test/Analysis/ConstantFolding/round.ll
View File

@ -1,12 +1,14 @@
; RUN: opt -S -instcombine < %s | FileCheck %s
; RUN: opt -S -early-cse < %s | FileCheck %s
declare float @roundf(float) #0
declare float @llvm.round.f32(float) #0
declare double @round(double) #0
declare double @llvm.round.f64(double) #0
; CHECK-LABEL: @constant_fold_round_f32_01
; CHECK-NEXT: ret float 1.000000e+00
define float @constant_fold_round_f32_01() #0 {
%x = call float @llvm.round.f32(float 1.25) #0
%x = call float @roundf(float 1.25) #0
ret float %x
}
@ -20,7 +22,7 @@ define float @constant_fold_round_f32_02() #0 {
; CHECK-LABEL: @constant_fold_round_f32_03
; CHECK-NEXT: ret float 2.000000e+00
define float @constant_fold_round_f32_03() #0 {
%x = call float @llvm.round.f32(float 1.5) #0
%x = call float @roundf(float 1.5) #0
ret float %x
}
@ -34,7 +36,7 @@ define float @constant_fold_round_f32_04() #0 {
; CHECK-LABEL: @constant_fold_round_f32_05
; CHECK-NEXT: ret float 3.000000e+00
define float @constant_fold_round_f32_05() #0 {
%x = call float @llvm.round.f32(float 2.75) #0
%x = call float @roundf(float 2.75) #0
ret float %x
}
@ -48,7 +50,7 @@ define float @constant_fold_round_f32_06() #0 {
; CHECK-LABEL: @constant_fold_round_f64_01
; CHECK-NEXT: ret double 1.000000e+00
define double @constant_fold_round_f64_01() #0 {
%x = call double @llvm.round.f64(double 1.3) #0
%x = call double @round(double 1.3) #0
ret double %x
}
@ -62,7 +64,7 @@ define double @constant_fold_round_f64_02() #0 {
; CHECK-LABEL: @constant_fold_round_f64_03
; CHECK-NEXT: ret double 2.000000e+00
define double @constant_fold_round_f64_03() #0 {
%x = call double @llvm.round.f64(double 1.5) #0
%x = call double @round(double 1.5) #0
ret double %x
}
@ -76,7 +78,7 @@ define double @constant_fold_round_f64_04() #0 {
; CHECK-LABEL: @constant_fold_round_f64_05
; CHECK-NEXT: ret double 3.000000e+00
define double @constant_fold_round_f64_05() #0 {
%x = call double @llvm.round.f64(double 2.7) #0
%x = call double @round(double 2.7) #0
ret double %x
}

105
test/Analysis/ConstantFolding/trunc.ll Normal file
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@ -0,0 +1,105 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -early-cse < %s | FileCheck %s
declare float @truncf(float) #0
declare float @llvm.trunc.f32(float) #0
declare double @trunc(double) #0
declare double @llvm.trunc.f64(double) #0
define float @constant_fold_trunc_f32_01() #0 {
; CHECK-LABEL: @constant_fold_trunc_f32_01(
; CHECK-NEXT: ret float 1.000000e+00
;
%x = call float @truncf(float 1.25) #0
ret float %x
}
define float @constant_fold_trunc_f32_02() #0 {
; CHECK-LABEL: @constant_fold_trunc_f32_02(
; CHECK-NEXT: ret float -1.000000e+00
;
%x = call float @llvm.trunc.f32(float -1.25) #0
ret float %x
}
define float @constant_fold_trunc_f32_03() #0 {
; CHECK-LABEL: @constant_fold_trunc_f32_03(
; CHECK-NEXT: ret float 1.000000e+00
;
%x = call float @truncf(float 1.5) #0
ret float %x
}
define float @constant_fold_trunc_f32_04() #0 {
; CHECK-LABEL: @constant_fold_trunc_f32_04(
; CHECK-NEXT: ret float -1.000000e+00
;
%x = call float @llvm.trunc.f32(float -1.5) #0
ret float %x
}
define float @constant_fold_trunc_f32_05() #0 {
; CHECK-LABEL: @constant_fold_trunc_f32_05(
; CHECK-NEXT: ret float 2.000000e+00
;
%x = call float @truncf(float 2.75) #0
ret float %x
}
define float @constant_fold_trunc_f32_06() #0 {
; CHECK-LABEL: @constant_fold_trunc_f32_06(
; CHECK-NEXT: ret float -2.000000e+00
;
%x = call float @llvm.trunc.f32(float -2.75) #0
ret float %x
}
define double @constant_fold_trunc_f64_01() #0 {
; CHECK-LABEL: @constant_fold_trunc_f64_01(
; CHECK-NEXT: ret double 1.000000e+00
;
%x = call double @trunc(double 1.3) #0
ret double %x
}
define double @constant_fold_trunc_f64_02() #0 {
; CHECK-LABEL: @constant_fold_trunc_f64_02(
; CHECK-NEXT: ret double -1.000000e+00
;
%x = call double @llvm.trunc.f64(double -1.3) #0
ret double %x
}
define double @constant_fold_trunc_f64_03() #0 {
; CHECK-LABEL: @constant_fold_trunc_f64_03(
; CHECK-NEXT: ret double 1.000000e+00
;
%x = call double @trunc(double 1.5) #0
ret double %x
}
define double @constant_fold_trunc_f64_04() #0 {
; CHECK-LABEL: @constant_fold_trunc_f64_04(
; CHECK-NEXT: ret double -1.000000e+00
;
%x = call double @llvm.trunc.f64(double -1.5) #0
ret double %x
}
define double @constant_fold_trunc_f64_05() #0 {
; CHECK-LABEL: @constant_fold_trunc_f64_05(
; CHECK-NEXT: ret double 2.000000e+00
;
%x = call double @trunc(double 2.7) #0
ret double %x
}
define double @constant_fold_trunc_f64_06() #0 {
; CHECK-LABEL: @constant_fold_trunc_f64_06(
; CHECK-NEXT: ret double -2.000000e+00
;
%x = call double @llvm.trunc.f64(double -2.7) #0
ret double %x
}
attributes #0 = { nounwind readnone }