return X;
// fsub 0.0, (fsub 0.0, X) ==> X if signed zeros are ignored.
+ // fsub 0.0, (fneg X) ==> X if signed zeros are ignored.
if (FMF.noSignedZeros() && match(Op0, m_AnyZeroFP()) &&
- match(Op1, m_FSub(m_AnyZeroFP(), m_Value(X))))
+ (match(Op1, m_FSub(m_AnyZeroFP(), m_Value(X))) ||
+ match(Op1, m_FNeg(m_Value(X)))))
return X;
// fsub nnan x, x ==> 0.0
; fsub nsz 0.0, (fneg X) ==> X
define float @fneg_x(float %a) {
; CHECK-LABEL: @fneg_x(
-; CHECK-NEXT: [[T1:%.*]] = fneg float [[A:%.*]]
-; CHECK-NEXT: [[RET:%.*]] = fsub nsz float 0.000000e+00, [[T1]]
-; CHECK-NEXT: ret float [[RET]]
+; CHECK-NEXT: ret float [[A:%.*]]
;
%t1 = fneg float %a
%ret = fsub nsz float 0.0, %t1
define <2 x float> @fneg_x_vec_undef1(<2 x float> %a) {
; CHECK-LABEL: @fneg_x_vec_undef1(
-; CHECK-NEXT: [[T1:%.*]] = fneg <2 x float> [[A:%.*]]
-; CHECK-NEXT: [[RET:%.*]] = fsub nsz <2 x float> <float 0.000000e+00, float undef>, [[T1]]
-; CHECK-NEXT: ret <2 x float> [[RET]]
+; CHECK-NEXT: ret <2 x float> [[A:%.*]]
;
%t1 = fneg <2 x float> %a
%ret = fsub nsz <2 x float> <float 0.0, float undef>, %t1