[PatternMatch, InstSimplify] allow undef elements when matching vector -0.0
This is the FP equivalent of D42818. Use it for the few cases in InstSimplify
with -0.0 folds (that's the only current use of m_NegZero()).
Differential Revision: https://reviews.llvm.org/D43792
llvm-svn: 327307
diff --git a/llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll b/llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll
index fc36493..94179a6 100644
--- a/llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll
+++ b/llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll
@@ -3,8 +3,7 @@
define <2 x float> @fsub_negzero_vec_undef_elts(<2 x float> %x) {
; CHECK-LABEL: @fsub_negzero_vec_undef_elts(
-; CHECK-NEXT: [[R:%.*]] = fsub nsz <2 x float> [[X:%.*]], <float undef, float -0.000000e+00>
-; CHECK-NEXT: ret <2 x float> [[R]]
+; CHECK-NEXT: ret <2 x float> [[X:%.*]]
;
%r = fsub nsz <2 x float> %x, <float undef, float -0.0>
ret <2 x float> %r
@@ -31,9 +30,7 @@
define <2 x float> @fsub_-0_-0_x_vec_undef_elts(<2 x float> %a) {
; CHECK-LABEL: @fsub_-0_-0_x_vec_undef_elts(
-; CHECK-NEXT: [[T1:%.*]] = fsub <2 x float> <float undef, float -0.000000e+00>, [[A:%.*]]
-; CHECK-NEXT: [[RET:%.*]] = fsub <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 = fsub <2 x float> <float undef, float -0.0>, %a
%ret = fsub <2 x float> <float -0.0, float undef>, %t1
@@ -84,8 +81,7 @@
define <2 x float> @fadd_x_n0_vec_undef_elt(<2 x float> %a) {
; CHECK-LABEL: @fadd_x_n0_vec_undef_elt(
-; CHECK-NEXT: [[RET:%.*]] = fadd <2 x float> [[A:%.*]], <float -0.000000e+00, float undef>
-; CHECK-NEXT: ret <2 x float> [[RET]]
+; CHECK-NEXT: ret <2 x float> [[A:%.*]]
;
%ret = fadd <2 x float> %a, <float -0.0, float undef>
ret <2 x float> %ret