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[InstSimplify] Fold nnan/ninf violation to poison 

As the comment already indicates, performing an operation with
nnan/ninf flags on a nan/inf or undef results in poison. Now that
we have a proper poison value, we no longer need to relax it to
undef.
This commit is contained in:
Nikita Popov 2021-01-03 22:03:53 +01:00
parent edb52c626b
commit 3715c99be9
3 changed files with 25 additions and 25 deletions
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6
llvm/lib/Analysis/InstructionSimplify.cpp
View File

@ -4781,11 +4781,11 @@ static Constant *simplifyFPOp(ArrayRef<Value *> Ops,
// If this operation has 'nnan' or 'ninf' and at least 1 disallowed operand // If this operation has 'nnan' or 'ninf' and at least 1 disallowed operand
// (an undef operand can be chosen to be Nan/Inf), then the result of // (an undef operand can be chosen to be Nan/Inf), then the result of
// this operation is poison. That result can be relaxed to undef. // this operation is poison.
if (FMF.noNaNs() && (IsNan || IsUndef)) if (FMF.noNaNs() && (IsNan || IsUndef))
return UndefValue::get(V->getType()); return PoisonValue::get(V->getType());
if (FMF.noInfs() && (IsInf || IsUndef)) if (FMF.noInfs() && (IsInf || IsUndef))
return UndefValue::get(V->getType()); return PoisonValue::get(V->getType());
if (IsUndef || IsNan) if (IsUndef || IsNan)
return propagateNaN(cast<Constant>(V)); return propagateNaN(cast<Constant>(V));

20
llvm/test/Transforms/InstSimplify/fp-nan.ll
View File

@ -137,7 +137,7 @@ define <2 x double> @unary_fneg_nan_2(<2 x double> %x) {
define float @fadd_nan_op0_nnan(float %x) { define float @fadd_nan_op0_nnan(float %x) {
; CHECK-LABEL: @fadd_nan_op0_nnan( ; CHECK-LABEL: @fadd_nan_op0_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fadd nnan float 0x7FF8000000000000, %x %r = fadd nnan float 0x7FF8000000000000, %x
ret float %r ret float %r
@ -145,7 +145,7 @@ define float @fadd_nan_op0_nnan(float %x) {
define float @fadd_nan_op1_fast(float %x) { define float @fadd_nan_op1_fast(float %x) {
; CHECK-LABEL: @fadd_nan_op1_fast( ; CHECK-LABEL: @fadd_nan_op1_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fadd fast float %x, 0x7FF8000000000000 %r = fadd fast float %x, 0x7FF8000000000000
ret float %r ret float %r
@ -153,7 +153,7 @@ define float @fadd_nan_op1_fast(float %x) {
define float @fsub_nan_op0_fast(float %x) { define float @fsub_nan_op0_fast(float %x) {
; CHECK-LABEL: @fsub_nan_op0_fast( ; CHECK-LABEL: @fsub_nan_op0_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fsub fast float 0x7FF8000000000000, %x %r = fsub fast float 0x7FF8000000000000, %x
ret float %r ret float %r
@ -161,7 +161,7 @@ define float @fsub_nan_op0_fast(float %x) {
define float @fsub_nan_op1_nnan(float %x) { define float @fsub_nan_op1_nnan(float %x) {
; CHECK-LABEL: @fsub_nan_op1_nnan( ; CHECK-LABEL: @fsub_nan_op1_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fsub nnan float %x, 0x7FF8000000000000 %r = fsub nnan float %x, 0x7FF8000000000000
ret float %r ret float %r
@ -169,7 +169,7 @@ define float @fsub_nan_op1_nnan(float %x) {
define float @fmul_nan_op0_nnan(float %x) { define float @fmul_nan_op0_nnan(float %x) {
; CHECK-LABEL: @fmul_nan_op0_nnan( ; CHECK-LABEL: @fmul_nan_op0_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fmul nnan float 0x7FF8000000000000, %x %r = fmul nnan float 0x7FF8000000000000, %x
ret float %r ret float %r
@ -177,7 +177,7 @@ define float @fmul_nan_op0_nnan(float %x) {
define float @fmul_nan_op1_fast(float %x) { define float @fmul_nan_op1_fast(float %x) {
; CHECK-LABEL: @fmul_nan_op1_fast( ; CHECK-LABEL: @fmul_nan_op1_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fmul fast float %x, 0x7FF8000000000000 %r = fmul fast float %x, 0x7FF8000000000000
ret float %r ret float %r
@ -185,7 +185,7 @@ define float @fmul_nan_op1_fast(float %x) {
define float @fdiv_nan_op0_fast(float %x) { define float @fdiv_nan_op0_fast(float %x) {
; CHECK-LABEL: @fdiv_nan_op0_fast( ; CHECK-LABEL: @fdiv_nan_op0_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fdiv fast float 0x7FF8000000000000, %x %r = fdiv fast float 0x7FF8000000000000, %x
ret float %r ret float %r
@ -193,7 +193,7 @@ define float @fdiv_nan_op0_fast(float %x) {
define float @fdiv_nan_op1_nnan(float %x) { define float @fdiv_nan_op1_nnan(float %x) {
; CHECK-LABEL: @fdiv_nan_op1_nnan( ; CHECK-LABEL: @fdiv_nan_op1_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fdiv nnan float %x, 0x7FF8000000000000 %r = fdiv nnan float %x, 0x7FF8000000000000
ret float %r ret float %r
@ -201,7 +201,7 @@ define float @fdiv_nan_op1_nnan(float %x) {
define float @frem_nan_op0_nnan(float %x) { define float @frem_nan_op0_nnan(float %x) {
; CHECK-LABEL: @frem_nan_op0_nnan( ; CHECK-LABEL: @frem_nan_op0_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = frem nnan float 0x7FF8000000000000, %x %r = frem nnan float 0x7FF8000000000000, %x
ret float %r ret float %r
@ -209,7 +209,7 @@ define float @frem_nan_op0_nnan(float %x) {
define float @frem_nan_op1_fast(float %x) { define float @frem_nan_op1_fast(float %x) {
; CHECK-LABEL: @frem_nan_op1_fast( ; CHECK-LABEL: @frem_nan_op1_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = frem fast float %x, 0x7FF8000000000000 %r = frem fast float %x, 0x7FF8000000000000
ret float %r ret float %r

24
llvm/test/Transforms/InstSimplify/fp-undef-poison.ll
View File

@ -167,7 +167,7 @@ define float @frem_poison_op1(float %x) {
define float @fadd_undef_op0_nnan(float %x) { define float @fadd_undef_op0_nnan(float %x) {
; CHECK-LABEL: @fadd_undef_op0_nnan( ; CHECK-LABEL: @fadd_undef_op0_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fadd nnan float undef, %x %r = fadd nnan float undef, %x
ret float %r ret float %r
@ -175,7 +175,7 @@ define float @fadd_undef_op0_nnan(float %x) {
define float @fadd_undef_op1_fast(float %x) { define float @fadd_undef_op1_fast(float %x) {
; CHECK-LABEL: @fadd_undef_op1_fast( ; CHECK-LABEL: @fadd_undef_op1_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fadd fast float %x, undef %r = fadd fast float %x, undef
ret float %r ret float %r
@ -183,7 +183,7 @@ define float @fadd_undef_op1_fast(float %x) {
define float @fsub_undef_op0_fast(float %x) { define float @fsub_undef_op0_fast(float %x) {
; CHECK-LABEL: @fsub_undef_op0_fast( ; CHECK-LABEL: @fsub_undef_op0_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fsub fast float undef, %x %r = fsub fast float undef, %x
ret float %r ret float %r
@ -191,7 +191,7 @@ define float @fsub_undef_op0_fast(float %x) {
define float @fsub_undef_op1_nnan(float %x) { define float @fsub_undef_op1_nnan(float %x) {
; CHECK-LABEL: @fsub_undef_op1_nnan( ; CHECK-LABEL: @fsub_undef_op1_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fsub nnan float %x, undef %r = fsub nnan float %x, undef
ret float %r ret float %r
@ -199,7 +199,7 @@ define float @fsub_undef_op1_nnan(float %x) {
define float @fmul_undef_op0_nnan(float %x) { define float @fmul_undef_op0_nnan(float %x) {
; CHECK-LABEL: @fmul_undef_op0_nnan( ; CHECK-LABEL: @fmul_undef_op0_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fmul nnan float undef, %x %r = fmul nnan float undef, %x
ret float %r ret float %r
@ -207,7 +207,7 @@ define float @fmul_undef_op0_nnan(float %x) {
define float @fmul_undef_op1_fast(float %x) { define float @fmul_undef_op1_fast(float %x) {
; CHECK-LABEL: @fmul_undef_op1_fast( ; CHECK-LABEL: @fmul_undef_op1_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fmul fast float %x, undef %r = fmul fast float %x, undef
ret float %r ret float %r
@ -215,7 +215,7 @@ define float @fmul_undef_op1_fast(float %x) {
define float @fdiv_undef_op0_fast(float %x) { define float @fdiv_undef_op0_fast(float %x) {
; CHECK-LABEL: @fdiv_undef_op0_fast( ; CHECK-LABEL: @fdiv_undef_op0_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fdiv fast float undef, %x %r = fdiv fast float undef, %x
ret float %r ret float %r
@ -223,7 +223,7 @@ define float @fdiv_undef_op0_fast(float %x) {
define float @fdiv_undef_op1_nnan(float %x) { define float @fdiv_undef_op1_nnan(float %x) {
; CHECK-LABEL: @fdiv_undef_op1_nnan( ; CHECK-LABEL: @fdiv_undef_op1_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = fdiv nnan float %x, undef %r = fdiv nnan float %x, undef
ret float %r ret float %r
@ -231,7 +231,7 @@ define float @fdiv_undef_op1_nnan(float %x) {
define float @frem_undef_op0_nnan(float %x) { define float @frem_undef_op0_nnan(float %x) {
; CHECK-LABEL: @frem_undef_op0_nnan( ; CHECK-LABEL: @frem_undef_op0_nnan(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = frem nnan float undef, %x %r = frem nnan float undef, %x
ret float %r ret float %r
@ -239,7 +239,7 @@ define float @frem_undef_op0_nnan(float %x) {
define float @frem_undef_op1_fast(float %x) { define float @frem_undef_op1_fast(float %x) {
; CHECK-LABEL: @frem_undef_op1_fast( ; CHECK-LABEL: @frem_undef_op1_fast(
; CHECK-NEXT: ret float undef ; CHECK-NEXT: ret float poison
; ;
%r = frem fast float %x, undef %r = frem fast float %x, undef
ret float %r ret float %r
@ -263,7 +263,7 @@ define double @fadd_ninf_nan_op1(double %x) {
define double @fdiv_ninf_inf_op0(double %x) { define double @fdiv_ninf_inf_op0(double %x) {
; CHECK-LABEL: @fdiv_ninf_inf_op0( ; CHECK-LABEL: @fdiv_ninf_inf_op0(
; CHECK-NEXT: ret double undef ; CHECK-NEXT: ret double poison
; ;
%r = fdiv ninf double 0x7ff0000000000000, %x %r = fdiv ninf double 0x7ff0000000000000, %x
ret double %r ret double %r
@ -271,7 +271,7 @@ define double @fdiv_ninf_inf_op0(double %x) {
define double @fadd_ninf_inf_op1(double %x) { define double @fadd_ninf_inf_op1(double %x) {
; CHECK-LABEL: @fadd_ninf_inf_op1( ; CHECK-LABEL: @fadd_ninf_inf_op1(
; CHECK-NEXT: ret double undef ; CHECK-NEXT: ret double poison
; ;
%r = fadd ninf double %x, 0xfff0000000000000 %r = fadd ninf double %x, 0xfff0000000000000
ret double %r ret double %r