[clang] [llvm] [RISCV][P-Ext] Prefer pack/ppairo.h over pncvt.h/pncvth.h in shuffle lowering (PR #227105)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 154226 tests passed
* 3427 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.CodeGen/RISCV/rvp-simd-32.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -mtriple=riscv32 -mattr=+experimental-p,+m,+zbb    -verify-machineinstrs < /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/RISCV/rvp-simd-32.ll |    /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck --check-prefixes=CHECK,RV32 /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/RISCV/rvp-simd-32.ll
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -mtriple=riscv32 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs
# note: command had no output on stdout or stderr
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck --check-prefixes=CHECK,RV32 /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/RISCV/rvp-simd-32.ll
# .---command stderr------------
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/RISCV/rvp-simd-32.ll:2696:14: error: RV32-NEXT: expected string not found in input
# | ; RV32-NEXT: pncvt.h a0, a0
# |              ^
# | <stdin>:2535:9: note: scanning from here
# | # %bb.0:
# |         ^
# | <stdin>:2536:2: note: possible intended match here
# |  pack a0, a0, a1
# |  ^
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/RISCV/rvp-simd-32.ll:2728:14: error: RV32-NEXT: expected string not found in input
# | ; RV32-NEXT: pncvth.h a0, a0
# |              ^
# | <stdin>:2571:9: note: scanning from here
# | # %bb.0:
# |         ^
# | <stdin>:2572:2: note: possible intended match here
# |  ppairo.h a0, a0, a1
# |  ^
# | 
# | Input file: <stdin>
# | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/RISCV/rvp-simd-32.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |              .
# |              .
# |              .
# |           2530:  .globl test_ppaire_v2i16 # -- Begin function test_ppaire_v2i16 
# |           2531:  .p2align 2 
# |           2532:  .type test_ppaire_v2i16, at function 
# |           2533: test_ppaire_v2i16: # @test_ppaire_v2i16 
# |           2534:  .cfi_startproc 
# |           2535: # %bb.0: 
# | next:2696'0            {   search range start (exclusive)
# | next:2696'1                error: no match found in search range
# |           2536:  pack a0, a0, a1 
# | next:2696'2      ?                 possible intended match
# |           2537:  ret 
# |           2538: .Lfunc_end192: 
# |           2539:  .size test_ppaire_v2i16, .Lfunc_end192-test_ppaire_v2i16 
# |           2540:  .cfi_endproc 
# |           2541:  # -- End function 
# |           2542:  .globl test_ppaireo_v2i16 # -- Begin function test_ppaireo_v2i16 
# |           2543:  .p2align 2 
# |           2544:  .type test_ppaireo_v2i16, at function 
# |           2545: test_ppaireo_v2i16: # @test_ppaireo_v2i16 
# | next:2696'3                        }                        search range end (exclusive)
# |           2546:  .cfi_startproc 
# |           2547: # %bb.0: 
# |           2548:  ppaireo.h a0, a0, a1 
# |           2549:  ret 
# |           2550: .Lfunc_end193: 
# |              .
# |              .
# |              .
# |           2566:  .globl test_ppairo_v2i16 # -- Begin function test_ppairo_v2i16 
# |           2567:  .p2align 2 
# |           2568:  .type test_ppairo_v2i16, at function 
# |           2569: test_ppairo_v2i16: # @test_ppairo_v2i16 
# |           2570:  .cfi_startproc 
# |           2571: # %bb.0: 
# | next:2728'0            {   search range start (exclusive)
# | next:2728'1                error: no match found in search range
# |           2572:  ppairo.h a0, a0, a1 
# | next:2728'2      ?                     possible intended match
# |           2573:  ret 
# |           2574: .Lfunc_end195: 
# |           2575:  .size test_ppairo_v2i16, .Lfunc_end195-test_ppairo_v2i16 
# |           2576:  .cfi_endproc 
# |           2577:  # -- End function 
# |           2578:  .globl test_bswap_v2i16 # -- Begin function test_bswap_v2i16 
# |           2579:  .p2align 2 
# |           2580:  .type test_bswap_v2i16, at function 
# |           2581: test_bswap_v2i16: # @test_bswap_v2i16 
# | next:2728'3                      }                      search range end (exclusive)
# |           2582:  .cfi_startproc 
# |           2583: # %bb.0: 
# |           2584:  ppairoe.b a0, a0, a0 
# |           2585:  ret 
# |           2586: .Lfunc_end196: 
# |              .
# |              .
# |              .
# | >>>>>>
# `-----------------------------
# 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/227105