if (isa<UndefValue>(Op0) || isa<UndefValue>(Op1))
return ConstantFP::getNaN(Op0->getType());
- // 0 % X -> 0
- // Requires that NaNs are off (X could be zero) and signed zeroes are
- // ignored (X could be positive or negative, so the output sign is unknown).
- if (FMF.noNaNs() && FMF.noSignedZeros() && match(Op0, m_AnyZero()))
- return Op0;
+ // Unlike fdiv, the result of frem always matches the sign of the dividend.
+ // The constant match may include undef elements in a vector, so return a full
+ // zero constant as the result.
+ if (FMF.noNaNs()) {
+ // 0 % X -> 0
+ if (match(Op0, m_Zero()))
+ return ConstantFP::getNullValue(Op0->getType());
+ // -0 % X -> -0
+ if (match(Op0, m_NegZero()))
+ return ConstantFP::getNegativeZero(Op0->getType());
+ }
return nullptr;
}
define double @frem_zero_by_x(double %x) {
; CHECK-LABEL: @frem_zero_by_x(
-; CHECK-NEXT: [[R:%.*]] = frem nnan double 0.000000e+00, [[X:%.*]]
-; CHECK-NEXT: ret double [[R]]
+; CHECK-NEXT: ret double 0.000000e+00
;
%r = frem nnan double 0.0, %x
ret double %r
define double @frem_negzero_by_x(double %x) {
; CHECK-LABEL: @frem_negzero_by_x(
-; CHECK-NEXT: [[R:%.*]] = frem nnan double -0.000000e+00, [[X:%.*]]
-; CHECK-NEXT: ret double [[R]]
+; CHECK-NEXT: ret double -0.000000e+00
;
%r = frem nnan double -0.0, %x
ret double %r
define <2 x double> @frem_negzero_by_x_vec_undef(<2 x double> %x) {
; CHECK-LABEL: @frem_negzero_by_x_vec_undef(
-; CHECK-NEXT: [[R:%.*]] = frem nnan <2 x double> <double undef, double -0.000000e+00>, [[X:%.*]]
-; CHECK-NEXT: ret <2 x double> [[R]]
+; CHECK-NEXT: ret <2 x double> <double -0.000000e+00, double -0.000000e+00>
;
%r = frem nnan <2 x double> <double undef, double -0.0>, %x
ret <2 x double> %r