[llvm] r332638 - [ARM] preserve test intent by removing undef

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Thu May 17 11:09:56 2018
New Revision: 332638

URL: http://llvm.org/viewvc/llvm-project?rev=332638&view=rev
Log:
[ARM] 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 https://reviews.llvm.org/D43141.

And as we did there, I'm trying to reduce the patch by
changing tests that would probably become meaningless
once we correct FP undef folding.

Modified:
    llvm/trunk/test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll

Modified: llvm/trunk/test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll?rev=332638&r1=332637&r2=332638&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll (original)
+++ llvm/trunk/test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll Thu May 17 11:09:56 2018
@@ -7,47 +7,47 @@ target triple = "armv7-eabi"
 define arm_aapcs_vfpcc void @foo() {
 entry:
   %0 = load float, float* null, align 4                  ; <float> [#uses=2]
-  %1 = fmul float %0, undef                       ; <float> [#uses=2]
+  %1 = fmul float %0, %0                       ; <float> [#uses=2]
   %2 = fmul float 0.000000e+00, %1                ; <float> [#uses=2]
   %3 = fmul float %0, %1                          ; <float> [#uses=1]
   %4 = fadd float 0.000000e+00, %3                ; <float> [#uses=1]
   %5 = fsub float 1.000000e+00, %4                ; <float> [#uses=1]
 ; CHECK-LABEL: foo:
 ; CHECK: vmov.f32 s{{[0-9]+}}, #1.000000e+00
-  %6 = fsub float 1.000000e+00, undef             ; <float> [#uses=2]
-  %7 = fsub float %2, undef                       ; <float> [#uses=1]
-  %8 = fsub float 0.000000e+00, undef             ; <float> [#uses=3]
-  %9 = fadd float %2, undef                       ; <float> [#uses=3]
+  %6 = fsub float 1.000000e+00, %2             ; <float> [#uses=2]
+  %7 = fsub float %2, %2                       ; <float> [#uses=1]
+  %8 = fsub float 0.000000e+00, %7             ; <float> [#uses=3]
+  %9 = fadd float %2, %2                       ; <float> [#uses=3]
   %10 = load float, float* undef, align 8                ; <float> [#uses=3]
   %11 = fmul float %8, %10                        ; <float> [#uses=1]
-  %12 = fadd float undef, %11                     ; <float> [#uses=2]
-  %13 = fmul float undef, undef                   ; <float> [#uses=1]
+  %12 = fadd float %11, %11                     ; <float> [#uses=2]
+  %13 = fmul float %12, %12                   ; <float> [#uses=1]
   %14 = fmul float %6, 0.000000e+00               ; <float> [#uses=1]
   %15 = fadd float %13, %14                       ; <float> [#uses=1]
   %16 = fmul float %9, %10                        ; <float> [#uses=1]
   %17 = fadd float %15, %16                       ; <float> [#uses=2]
-  %18 = fmul float 0.000000e+00, undef            ; <float> [#uses=1]
+  %18 = fmul float 0.000000e+00, %17            ; <float> [#uses=1]
   %19 = fadd float %18, 0.000000e+00              ; <float> [#uses=1]
-  %20 = fmul float undef, %10                     ; <float> [#uses=1]
+  %20 = fmul float %10, %10                     ; <float> [#uses=1]
   %21 = fadd float %19, %20                       ; <float> [#uses=1]
   %22 = load float, float* undef, align 8                ; <float> [#uses=1]
   %23 = fmul float %5, %22                        ; <float> [#uses=1]
-  %24 = fadd float %23, undef                     ; <float> [#uses=1]
+  %24 = fadd float %23, %23                     ; <float> [#uses=1]
   %25 = load float, float* undef, align 8                ; <float> [#uses=2]
   %26 = fmul float %8, %25                        ; <float> [#uses=1]
   %27 = fadd float %24, %26                       ; <float> [#uses=1]
   %28 = fmul float %9, %25                        ; <float> [#uses=1]
-  %29 = fadd float undef, %28                     ; <float> [#uses=1]
+  %29 = fadd float %28, %28                     ; <float> [#uses=1]
   %30 = fmul float %8, undef                      ; <float> [#uses=1]
-  %31 = fadd float undef, %30                     ; <float> [#uses=1]
-  %32 = fmul float %6, undef                      ; <float> [#uses=1]
-  %33 = fadd float undef, %32                     ; <float> [#uses=1]
-  %34 = fmul float %9, undef                      ; <float> [#uses=1]
+  %31 = fadd float %30, %30                     ; <float> [#uses=1]
+  %32 = fmul float %6, %6                      ; <float> [#uses=1]
+  %33 = fadd float %32, %32                     ; <float> [#uses=1]
+  %34 = fmul float %9, %9                      ; <float> [#uses=1]
   %35 = fadd float %33, %34                       ; <float> [#uses=1]
   %36 = fmul float 0.000000e+00, undef            ; <float> [#uses=1]
-  %37 = fmul float %7, undef                      ; <float> [#uses=1]
+  %37 = fmul float %7, %7                      ; <float> [#uses=1]
   %38 = fadd float %36, %37                       ; <float> [#uses=1]
-  %39 = fmul float undef, undef                   ; <float> [#uses=1]
+  %39 = fmul float %38, %38                   ; <float> [#uses=1]
   %40 = fadd float %38, %39                       ; <float> [#uses=1]
   store float %12, float* undef, align 8
   store float %17, float* undef, align 4
@@ -57,9 +57,9 @@ entry:
   store float %31, float* undef, align 8
   store float %40, float* undef, align 8
   store float %12, float* null, align 8
-  %41 = fmul float %17, undef                     ; <float> [#uses=1]
-  %42 = fadd float %41, undef                     ; <float> [#uses=1]
-  %43 = fmul float %35, undef                     ; <float> [#uses=1]
+  %41 = fmul float %17, %17                     ; <float> [#uses=1]
+  %42 = fadd float %41, %41                     ; <float> [#uses=1]
+  %43 = fmul float %35, %35                     ; <float> [#uses=1]
   %44 = fadd float %42, %43                       ; <float> [#uses=1]
   store float %44, float* null, align 4
   unreachable