[x86] add test for commuted variant for fsub fold; NFC

llvm-svn: 339300

1 files changed, 21 insertions, 2 deletions

diff --git a/llvm/test/CodeGen/X86/fp-fold.ll b/llvm/test/CodeGen/X86/fp-fold.ll
index 1102b755130..60da70ab3ac 100644
--- a/llvm/test/CodeGen/X86/fp-fold.ll
+++ b/llvm/test/CodeGen/X86/fp-fold.ll
@@ -103,13 +103,32 @@ define float @fsub_neg_y(float %x, float %y) {
 ; UNSAFE-NEXT:    subss %xmm1, %xmm0
 ; UNSAFE-NEXT:    addss %xmm1, %xmm0
 ; UNSAFE-NEXT:    retq
-  %mul = fmul float %x, 5.000000e+00
+  %mul = fmul float %x, 5.0
   %add = fadd float %mul, %y
   %r = fsub nsz reassoc float %y, %add
   ret float %r
 }
 
-; Test node-level flags with:
+define float @fsub_neg_y_commute(float %x, float %y) {
+; STRICT-LABEL: fsub_neg_y_commute:
+; STRICT:       # %bb.0:
+; STRICT-NEXT:    mulss {{.*}}(%rip), %xmm0
+; STRICT-NEXT:    addss %xmm1, %xmm0
+; STRICT-NEXT:    subss %xmm0, %xmm1
+; STRICT-NEXT:    movaps %xmm1, %xmm0
+; STRICT-NEXT:    retq
+;
+; UNSAFE-LABEL: fsub_neg_y_commute:
+; UNSAFE:       # %bb.0:
+; UNSAFE-NEXT:    mulss {{.*}}(%rip), %xmm0
+; UNSAFE-NEXT:    subss %xmm1, %xmm0
+; UNSAFE-NEXT:    addss %xmm1, %xmm0
+; UNSAFE-NEXT:    retq
+  %mul = fmul float %x, 5.0
+  %add = fadd float %y, %mul
+  %r = fsub nsz reassoc float %y, %add
+  ret float %r
+}
 ; Y - (X + Y) --> -X
 
 define float @fsub_fadd_common_op_fneg(float %x, float %y) {