[llvm] [VectorCombine] Fold contiguous loads into a single vector load (PR #185736)

[via llvm-commits]

github-actions[bot] wrote:

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

* 181077 tests passed
* 3712 tests skipped
* 1 test failed

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

### LLVM
<details>
<summary>LLVM.Transforms/VectorCombine/X86/load-widening.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/opt < /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Transforms/VectorCombine/X86/load-widening.ll -passes=vector-combine -S -mtriple=x86_64-- -mcpu=x86-64    | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Transforms/VectorCombine/X86/load-widening.ll --check-prefixes=CHECK,SSE
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/opt -passes=vector-combine -S -mtriple=x86_64-- -mcpu=x86-64
# 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/Transforms/VectorCombine/X86/load-widening.ll --check-prefixes=CHECK,SSE
# .---command stderr------------
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Transforms/VectorCombine/X86/load-widening.ll:259:13: error: SSE-NEXT: expected string not found in input
# | ; SSE-NEXT: [[TMP1:%.*]] = load <10 x double>, ptr [[P:%.*]], align 512
# |             ^
# | <stdin>:131:34: note: scanning from here
# | define <8 x double> @load_v16f64(ptr %p) #0 {
# |                                  ^
# | <stdin>:131:34: note: pattern attempts to capture variables: "P", "TMP1"
# | define <8 x double> @load_v16f64(ptr %p) #0 {
# |                                  ^
# | <stdin>:133:2: note: possible intended match here
# |  %s = load <8 x double>, ptr %1, align 8
# |  ^
# | 
# | Input file: <stdin>
# | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/Transforms/VectorCombine/X86/load-widening.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |           126: define <2 x i4> @vec_with_2elts_128bits_i4(ptr align 16 dereferenceable(16) %p) #0 { 
# |           127:  %r = load <2 x i4>, ptr %p, align 16 
# |           128:  ret <2 x i4> %r 
# |           129: } 
# |           130:  
# |           131: define <8 x double> @load_v16f64(ptr %p) #0 { 
# | next:259'0                                     {               search range start (exclusive)
# | next:259'1                                                     error: no match found in search range
# | next:259'2                                                     pattern attempts to capture variables: "P", "TMP1"
# |           132:  %1 = getelementptr i8, ptr %p, i64 8 
# |           133:  %s = load <8 x double>, ptr %1, align 8 
# | next:259'3      ?                                         possible intended match
# |           134:  ret <8 x double> %s 
# |           135: } 
# |           136:  
# |           137: define <4 x ptr> @load_v16ptr(ptr %p) #0 { 
# | next:259'4                                   }              search range end (exclusive)
# |           138:  %1 = load <10 x ptr>, ptr %p, align 128 
# |           139:  %s = shufflevector <10 x ptr> %1, <10 x ptr> poison, <4 x i32> <i32 1, i32 2, i32 3, i32 8> 
# |           140:  ret <4 x ptr> %s 
# |           141: } 
# |           142:  
# |             .
# |             .
# |             .
# | >>>>>>
# `-----------------------------
# 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/185736