[llvm] Clean start of issue 186335 - [DAG] isKnownNeverZero - add ISD::VECTOR_SHUFFLE handling (PR #187615)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 132528 tests passed
* 3020 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.CodeGen/X86/known-never-zero.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\llc.exe < C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\known-never-zero.ll -mtriple=i686-unknown-unknown -mattr=+sse2 | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\known-never-zero.ll --check-prefixes=X86
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\llc.exe' -mtriple=i686-unknown-unknown -mattr=+sse2
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\known-never-zero.ll' --check-prefixes=X86
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\known-never-zero.ll:2725:13: error: X86-NEXT: expected string not found in input
# | ; X86-NEXT: bsfl %eax, %ecx
# |             ^
# | <stdin>:2137:18: note: scanning from here
# |  movd %xmm0, %eax
# |                  ^
# | <stdin>:2138:6: note: possible intended match here
# |  rep bsfl %eax, %eax
# |      ^
# | 
# | Input file: <stdin>
# | Check file: C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\known-never-zero.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |              .
# |              .
# |              .
# |           2132:  pshufhw $36, %xmm0, %xmm0 # xmm0 = xmm0[0,1,2,3,4,5,6,4] 
# |           2133:  psrad $16, %xmm0 
# |           2134:  movdqa %xmm1, 16(%eax) 
# |           2135:  movdqa %xmm0, (%eax) 
# |           2136:  pshufd $85, %xmm0, %xmm0 # xmm0 = xmm0[1,1,1,1] 
# |           2137:  movd %xmm0, %eax 
# | next:2725'0                      X error: no match found
# |           2138:  rep bsfl %eax, %eax 
# | next:2725'0     ~~~~~~~~~~~~~~~~~~~~~
# | next:2725'1          ?                possible intended match
# |           2139:  retl 
# | next:2725'0     ~~~~~~
# |           2140: .Lfunc_end88: 
# | next:2725'0     ~~~~~~~~~~~~~~
# |           2141:  .size sext_known_nonzero_vec, .Lfunc_end88-sext_known_nonzero_vec 
# | next:2725'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           2142:  .cfi_endproc 
# | next:2725'0     ~~~~~~~~~~~~~~
# |           2143:  # -- End function 
# | next:2725'0     ~~~~~~~~~~~~~~~~~~~
# |              .
# |              .
# |              .
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/187615