[llvm] [AArch64] Lower v8bf16 FMUL to BFMLAL top/bottom with +sve (PR #169655)

[via llvm-commits]

github-actions[bot] wrote:

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

* 166753 tests passed
* 2909 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.CodeGen/AArch64/fixed-length-bf16-arith.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -mattr=+sve,+bf16             < /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AArch64/fixed-length-bf16-arith.ll | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AArch64/fixed-length-bf16-arith.ll --check-prefixes=CHECK,NOB16B16
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -mattr=+sve,+bf16
# note: command had no output on stdout or stderr
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AArch64/fixed-length-bf16-arith.ll --check-prefixes=CHECK,NOB16B16
# .---command stderr------------
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AArch64/fixed-length-bf16-arith.ll:764:18: error: NOB16B16-NEXT: expected string not found in input
# | ; NOB16B16-NEXT: shll v2.4s, v1.4h, #16
# |                  ^
# | <stdin>:658:10: note: scanning from here
# | // %bb.0:
# |          ^
# | <stdin>:662:5: note: possible intended match here
# |  bfmlalb v2.4s, v0.8h, v1.8h
# |     ^
# | 
# | Input file: <stdin>
# | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AArch64/fixed-length-bf16-arith.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |           653:  .globl fmul_v8bf16 // -- Begin function fmul_v8bf16 
# |           654:  .p2align 2 
# |           655:  .type fmul_v8bf16, at function 
# |           656: fmul_v8bf16: // @fmul_v8bf16 
# |           657:  .cfi_startproc 
# |           658: // %bb.0: 
# | next:764'0              X error: no match found
# |           659:  movi v2.4s, #128, lsl #24 
# | next:764'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           660:  movi v3.4s, #128, lsl #24 
# | next:764'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           661:  ptrue p0.s, vl4 
# | next:764'0     ~~~~~~~~~~~~~~~~~
# |           662:  bfmlalb v2.4s, v0.8h, v1.8h 
# | next:764'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | next:764'1         ?                         possible intended match
# |           663:  bfmlalt v3.4s, v0.8h, v1.8h 
# | next:764'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           664:  bfcvt z2.h, p0/m, z2.s 
# | next:764'0     ~~~~~~~~~~~~~~~~~~~~~~~~
# |           665:  bfcvtnt z2.h, p0/m, z3.s 
# | next:764'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           666:  mov v0.16b, v2.16b 
# | next:764'0     ~~~~~~~~~~~~~~~~~~~~
# |           667:  ret 
# | next:764'0     ~~~~~
# |             .
# |             .
# |             .
# | >>>>>>
# `-----------------------------
# 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/169655