[x86] preserve test intent by removing undef

We need to clean up the DAG floating-point undef logic.
This process is similar to how we handled integer undef
logic in D43141.

And as we did there, I'm trying to reduce the patch by
changing tests that would probably become meaningless
once we make those fixes.

llvm-svn: 332500

diff --git a/llvm/test/CodeGen/X86/pr34177.ll b/llvm/test/CodeGen/X86/pr34177.ll
index 5904e5d..018abab 100644 (file)
--- a/llvm/test/CodeGen/X86/pr34177.ll
+++ b/llvm/test/CodeGen/X86/pr34177.ll
@@ -24,27 +24,27 @@ define void @test() local_unnamed_addr {
 ; CHECK-NEXT:    fcmove %st(4), %st(0)
 ; CHECK-NEXT:    movl $1, %eax
 ; CHECK-NEXT:    cmpq %rax, %rax
-; CHECK-NEXT:    fld %st(3)
-; CHECK-NEXT:    fcmove %st(5), %st(0)
-; CHECK-NEXT:    fstp %st(5)
-; CHECK-NEXT:    fxch %st(2)
-; CHECK-NEXT:    fadd %st(3)
-; CHECK-NEXT:    fxch %st(4)
-; CHECK-NEXT:    fadd %st(3)
+; CHECK-NEXT:    fxch %st(3)
+; CHECK-NEXT:    fcmove %st(4), %st(0)
+; CHECK-NEXT:    fstp %st(4)
+; CHECK-NEXT:    fxch %st(1)
+; CHECK-NEXT:    fadd %st(0), %st(0)
+; CHECK-NEXT:    fxch %st(3)
+; CHECK-NEXT:    fadd %st(0), %st(0)
 ; CHECK-NEXT:    fxch %st(2)
-; CHECK-NEXT:    fadd %st(3)
+; CHECK-NEXT:    fadd %st(0), %st(0)
 ; CHECK-NEXT:    fxch %st(1)
-; CHECK-NEXT:    faddp %st(3)
+; CHECK-NEXT:    fadd %st(0), %st(0)
 ; CHECK-NEXT:    fxch %st(3)
 ; CHECK-NEXT:    fstpt (%rax)
-; CHECK-NEXT:    fxch %st(1)
+; CHECK-NEXT:    fxch %st(2)
 ; CHECK-NEXT:    fstpt (%rax)
 ; CHECK-NEXT:    fxch %st(1)
 ; CHECK-NEXT:    fstpt (%rax)
 ; CHECK-NEXT:    fstpt (%rax)
   %1 = icmp eq <4 x i64> <i64 0, i64 1, i64 2, i64 3>, undef
   %2 = select <4 x i1> %1, <4 x x86_fp80> <x86_fp80 0xK3FFF8000000000000000, x86_fp80 0xK3FFF8000000000000000, x86_fp80 0xK3FFF8000000000000000, x86_fp80 0xK3FFF8000000000000000>, <4 x x86_fp80> zeroinitializer
-  %3 = fadd <4 x x86_fp80> undef, %2
+  %3 = fadd <4 x x86_fp80> %2, %2
   %4 = shufflevector <4 x x86_fp80> %3, <4 x x86_fp80> undef, <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>
   store <8 x x86_fp80> %4, <8 x x86_fp80>* undef, align 16
   unreachable