[llvm] [ConstantFolding] Fix nvvm_round folding on PPC (PR #149837)

[Lewis Crawford via llvm-commits]

LewisCrawford wrote:

This should fix the test failure here: https://lab.llvm.org/buildbot/#/builders/64/builds/4929 

> + /home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/build/bin/FileCheck /home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/test/Transforms/InstSimplify/const-fold-nvvm-unary-arithmetic.ll
> /home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/test/Transforms/InstSimplify/const-fold-nvvm-unary-arithmetic.ll:421:15: error: CHECK-NEXT: expected string not found in input
> ; CHECK-NEXT: ret double -0.000000e+00
>               ^
> <stdin>:196:44: note: scanning from here
> define double @test_round_d_neg_subnorm() {
>                                            ^
> <stdin>:197:2: note: possible intended match here
>  ret double 0.000000e+00
>  ^
> /home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/test/Transforms/InstSimplify/const-fold-nvvm-unary-arithmetic.ll:429:15: error: CHECK-NEXT: expected string not found in input
> ; CHECK-NEXT: ret float -0.000000e+00
>               ^
> <stdin>:200:43: note: scanning from here
> define float @test_round_f_neg_subnorm() {
>                                           ^
> <stdin>:201:2: note: possible intended match here
>  ret float 0.000000e+00
>  ^
> Input file: <stdin>
> Check file: /home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/test/Transforms/InstSimplify/const-fold-nvvm-unary-arithmetic.ll
> -dump-input=help explains the following input dump.
> Input was:
> <<<<<<
>             .
>             .
>             .
>           191:  
>           192: define float @test_round_ftz_f_neg_1_5() { 
>           193:  ret float -2.000000e+00 
>           194: } 
>           195:  
>           196: define double @test_round_d_neg_subnorm() { 
> next:421'0                                                X error: no match found
>           197:  ret double 0.000000e+00 
> next:421'0     ~~~~~~~~~~~~~~~~~~~~~~~~~
> next:421'1      ?                        possible intended match
>           198: } 
> next:421'0     ~~
>           199:  
> next:421'0     ~
>           200: define float @test_round_f_neg_subnorm() { 
> next:421'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> next:429'0                                               X error: no match found
>           201:  ret float 0.000000e+00 
> next:429'0     ~~~~~~~~~~~~~~~~~~~~~~~~
> next:429'1      ?                       possible intended match
>           202: } 
> next:429'0     ~~
>           203:  
> next:429'0     ~
>           204: define float @test_round_ftz_f_neg_subnorm() { 
> next:429'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>           205:  ret float -0.000000e+00 
>           206: } 
>             .
>             .
>             .
> >>>>>>

https://github.com/llvm/llvm-project/pull/149837