[llvm] [CodeGen] Introduce Static Data Splitter pass (PR #122183)

[Paul Kirth via llvm-commits]

ilovepi wrote:

This patch seems to have broken a number of build bots. Would you mind reverting until a fix is ready?

>From the error message, it seems like the new test is failing to match correctly in some cases, so maybe its an issue w/ `-DAG`? 

```

Exit Code: 1

Command Output (stderr):
--
RUN: at line 9: /b/s/w/ir/x/w/llvm_build/bin/llc -mtriple=x86_64-unknown-linux-gnu -stop-after=finalize-isel -min-jump-table-entries=2 /b/s/w/ir/x/w/llvm-llvm-project/llvm/test/CodeGen/X86/jump-table-partition.ll -o /b/s/w/ir/x/w/llvm_build/test/CodeGen/X86/Output/jump-table-partition.ll.tmp.mir
+ /b/s/w/ir/x/w/llvm_build/bin/llc -mtriple=x86_64-unknown-linux-gnu -stop-after=finalize-isel -min-jump-table-entries=2 /b/s/w/ir/x/w/llvm-llvm-project/llvm/test/CodeGen/X86/jump-table-partition.ll -o /b/s/w/ir/x/w/llvm_build/test/CodeGen/X86/Output/jump-table-partition.ll.tmp.mir
RUN: at line 10: /b/s/w/ir/x/w/llvm_build/bin/llc -mtriple=x86_64-unknown-linux-gnu --run-pass=static-data-splitter -stats -x mir /b/s/w/ir/x/w/llvm_build/test/CodeGen/X86/Output/jump-table-partition.ll.tmp.mir -o - 2>&1 | /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/llvm/test/CodeGen/X86/jump-table-partition.ll --check-prefix=STAT
+ /b/s/w/ir/x/w/llvm_build/bin/FileCheck /b/s/w/ir/x/w/llvm-llvm-project/llvm/test/CodeGen/X86/jump-table-partition.ll --check-prefix=STAT
+ /b/s/w/ir/x/w/llvm_build/bin/llc -mtriple=x86_64-unknown-linux-gnu --run-pass=static-data-splitter -stats -x mir /b/s/w/ir/x/w/llvm_build/test/CodeGen/X86/Output/jump-table-partition.ll.tmp.mir -o -
/b/s/w/ir/x/w/llvm-llvm-project/llvm/test/CodeGen/X86/jump-table-partition.ll:16:13: error: STAT-DAG: expected string not found in input
; STAT-DAG: 2 static-data-splitter - Number of cold jump tables seen
            ^
<stdin>:1:1: note: scanning from here
--- |
^
<stdin>:10:7: note: possible intended match here
 @case2 = private constant [7 x i8] c"case 2\00"
      ^

Input file: <stdin>
Check file: /b/s/w/ir/x/w/llvm-llvm-project/llvm/test/CodeGen/X86/jump-table-partition.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
          1: --- | 
dag:16'0     X~~~~~ error: no match found
          2:  ; ModuleID = '/b/s/w/ir/x/w/llvm_build/test/CodeGen/X86/Output/jump-table-partition.ll.tmp.mir' 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          3:  source_filename = "/b/s/w/ir/x/w/llvm-llvm-project/llvm/test/CodeGen/X86/jump-table-partition.ll" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          4:  target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          5:  target triple = "x86_64-unknown-linux-gnu" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          6:   
dag:16'0     ~~
          7:  @str.9 = private constant [7 x i8] c".str.9\00" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          8:  @str.10 = private constant [8 x i8] c".str.10\00" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          9:  @str.11 = private constant [8 x i8] c".str.11\00" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         10:  @case2 = private constant [7 x i8] c"case 2\00" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dag:16'1           ?                                           possible intended match
         11:  @case1 = private constant [7 x i8] c"case 1\00" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         12:  @default = private constant [8 x i8] c"default\00" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         13:  @jt3 = private constant [4 x i8] c"jt3\00" 
dag:16'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         14:   
dag:16'0     ~~
         15:  define i32 @foo(i32 %num) !prof !13 !section_prefix !14 {
```

https://github.com/llvm/llvm-project/pull/122183