[x86] add test for mismatched fneg; NFC

issue #55758
2022-06-01 08:05:35 -04:00 · 2022-06-01 08:05:35 -04:00 · 3c3f2f99c4
commit 3c3f2f99c4
parent b2a9ea4420
1 changed files with 12 additions and 0 deletions
--- a/llvm/test/CodeGen/X86/neg_fp.ll
+++ b/llvm/test/CodeGen/X86/neg_fp.ll
@ -81,3 +81,15 @@ define float @fdiv_extra_use_changes_cost(float %a0, float %a1, float %a2) nounw
  %div5 = fdiv fast float %sub4, %mul2
  ret float %div5
 }
+
+; FIXME: PR55758 - this is not -(-X)
+
+define <2 x i64> @fneg_mismatched_sizes(<4 x float> %x) {
+; CHECK-LABEL: fneg_mismatched_sizes:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    retl
+  %n = fneg <4 x float> %x
+  %b = bitcast <4 x float> %n to <2 x i64>
+  %r = xor <2 x i64> %b, <i64 -9223372036854775808, i64 -9223372036854775808>
+  ret <2 x i64> %r
+}