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InstSimplify: Fold round intrinsics from sitofp/uitofp

Browse Source 
https://godbolt.org/z/gEMRZb

llvm-svn: 357549
This commit is contained in:
Matt Arsenault 2019-04-03 00:25:06 +00:00
parent e1b323e823
commit 453545087d
2 changed files with 28 additions and 24 deletions
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16
lib/Analysis/InstructionSimplify.cpp
View File

@ -4701,6 +4701,22 @@ static Value *simplifyUnaryIntrinsic(Function *F, Value *Op0,
match(Op0, m_Intrinsic<Intrinsic::pow>(m_SpecificFP(10.0),
m_Value(X)))) return X;
break;
case Intrinsic::floor:
case Intrinsic::trunc:
case Intrinsic::ceil:
case Intrinsic::round:
case Intrinsic::nearbyint:
case Intrinsic::rint: {
// floor (sitofp x) -> sitofp x
// floor (uitofp x) -> uitofp x
//
// Converting from int always results in a finite integral number or
// infinity. For either of those inputs, these rounding functions always
// return the same value, so the rounding can be eliminated.
if (match(Op0, m_SIToFP(m_Value())) || match(Op0, m_UIToFP(m_Value())))
return Op0;
break;
}
default:
break;
}

36
test/Transforms/InstSimplify/round-intrinsics.ll
View File

@ -4,8 +4,7 @@
define float @sitofp_floor(i32 %arg) {
; CHECK-LABEL: @sitofp_floor(
; CHECK-NEXT: [[CVT:%.*]] = sitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[ROUND:%.*]] = call float @llvm.floor.f32(float [[CVT]])
; CHECK-NEXT: ret float [[ROUND]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = sitofp i32 %arg to float
%round = call float @llvm.floor.f32(float %cvt)
@ -15,8 +14,7 @@ define float @sitofp_floor(i32 %arg) {
define float @uitofp_floor(i32 %arg) {
; CHECK-LABEL: @uitofp_floor(
; CHECK-NEXT: [[CVT:%.*]] = uitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[ROUND:%.*]] = call float @llvm.floor.f32(float [[CVT]])
; CHECK-NEXT: ret float [[ROUND]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = uitofp i32 %arg to float
%round = call float @llvm.floor.f32(float %cvt)
@ -26,8 +24,7 @@ define float @uitofp_floor(i32 %arg) {
define float @sitofp_trunc(i32 %arg) {
; CHECK-LABEL: @sitofp_trunc(
; CHECK-NEXT: [[CVT:%.*]] = sitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[ROUND:%.*]] = call float @llvm.trunc.f32(float [[CVT]])
; CHECK-NEXT: ret float [[ROUND]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = sitofp i32 %arg to float
%round = call float @llvm.trunc.f32(float %cvt)
@ -37,8 +34,7 @@ define float @sitofp_trunc(i32 %arg) {
define float @uitofp_trunc(i32 %arg) {
; CHECK-LABEL: @uitofp_trunc(
; CHECK-NEXT: [[CVT:%.*]] = uitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[ROUND:%.*]] = call float @llvm.trunc.f32(float [[CVT]])
; CHECK-NEXT: ret float [[ROUND]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = uitofp i32 %arg to float
%round = call float @llvm.trunc.f32(float %cvt)
@ -48,8 +44,7 @@ define float @uitofp_trunc(i32 %arg) {
define float @sitofp_ceil(i32 %arg) {
; CHECK-LABEL: @sitofp_ceil(
; CHECK-NEXT: [[CVT:%.*]] = sitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[ROUND:%.*]] = call float @llvm.ceil.f32(float [[CVT]])
; CHECK-NEXT: ret float [[ROUND]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = sitofp i32 %arg to float
%round = call float @llvm.ceil.f32(float %cvt)
@ -59,8 +54,7 @@ define float @sitofp_ceil(i32 %arg) {
define float @uitofp_ceil(i32 %arg) {
; CHECK-LABEL: @uitofp_ceil(
; CHECK-NEXT: [[CVT:%.*]] = uitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[ROUND:%.*]] = call float @llvm.ceil.f32(float [[CVT]])
; CHECK-NEXT: ret float [[ROUND]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = uitofp i32 %arg to float
%round = call float @llvm.ceil.f32(float %cvt)
@ -70,8 +64,7 @@ define float @uitofp_ceil(i32 %arg) {
define float @sitofp_round(i32 %arg) {
; CHECK-LABEL: @sitofp_round(
; CHECK-NEXT: [[CVT:%.*]] = sitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[ROUND:%.*]] = call float @llvm.round.f32(float [[CVT]])
; CHECK-NEXT: ret float [[ROUND]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = sitofp i32 %arg to float
%round = call float @llvm.round.f32(float %cvt)
@ -81,8 +74,7 @@ define float @sitofp_round(i32 %arg) {
define float @uitofp_round(i32 %arg) {
; CHECK-LABEL: @uitofp_round(
; CHECK-NEXT: [[CVT:%.*]] = uitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[ROUND:%.*]] = call float @llvm.round.f32(float [[CVT]])
; CHECK-NEXT: ret float [[ROUND]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = uitofp i32 %arg to float
%round = call float @llvm.round.f32(float %cvt)
@ -92,8 +84,7 @@ define float @uitofp_round(i32 %arg) {
define float @sitofp_nearbyint(i32 %arg) {
; CHECK-LABEL: @sitofp_nearbyint(
; CHECK-NEXT: [[CVT:%.*]] = sitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[NEARBYINT:%.*]] = call float @llvm.nearbyint.f32(float [[CVT]])
; CHECK-NEXT: ret float [[NEARBYINT]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = sitofp i32 %arg to float
%nearbyint = call float @llvm.nearbyint.f32(float %cvt)
@ -103,8 +94,7 @@ define float @sitofp_nearbyint(i32 %arg) {
define float @uitofp_nearbyint(i32 %arg) {
; CHECK-LABEL: @uitofp_nearbyint(
; CHECK-NEXT: [[CVT:%.*]] = uitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[NEARBYINT:%.*]] = call float @llvm.nearbyint.f32(float [[CVT]])
; CHECK-NEXT: ret float [[NEARBYINT]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = uitofp i32 %arg to float
%nearbyint = call float @llvm.nearbyint.f32(float %cvt)
@ -114,8 +104,7 @@ define float @uitofp_nearbyint(i32 %arg) {
define float @sitofp_rint(i32 %arg) {
; CHECK-LABEL: @sitofp_rint(
; CHECK-NEXT: [[CVT:%.*]] = sitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[RINT:%.*]] = call float @llvm.rint.f32(float [[CVT]])
; CHECK-NEXT: ret float [[RINT]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = sitofp i32 %arg to float
%rint = call float @llvm.rint.f32(float %cvt)
@ -125,8 +114,7 @@ define float @sitofp_rint(i32 %arg) {
define float @uitofp_rint(i32 %arg) {
; CHECK-LABEL: @uitofp_rint(
; CHECK-NEXT: [[CVT:%.*]] = uitofp i32 [[ARG:%.*]] to float
; CHECK-NEXT: [[RINT:%.*]] = call float @llvm.rint.f32(float [[CVT]])
; CHECK-NEXT: ret float [[RINT]]
; CHECK-NEXT: ret float [[CVT]]
;
%cvt = uitofp i32 %arg to float
%rint = call float @llvm.rint.f32(float %cvt)