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198d8baafbfdfcf5a5e219602a5d94ed263973b4
llvm-6502/test/Transforms/SampleProfile/branch.ll
David Blaikie 198d8baafb [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 
One of several parallel first steps to remove the target type of pointers,
replacing them with a single opaque pointer type.

This adds an explicit type parameter to the gep instruction so that when the
first parameter becomes an opaque pointer type, the type to gep through is
still available to the instructions.

* This doesn't modify gep operators, only instructions (operators will be
  handled separately)

* Textual IR changes only. Bitcode (including upgrade) and changing the
  in-memory representation will be in separate changes.

* geps of vectors are transformed as:
    getelementptr <4 x float*> %x, ...
  ->getelementptr float, <4 x float*> %x, ...
  Then, once the opaque pointer type is introduced, this will ultimately look
  like:
    getelementptr float, <4 x ptr> %x
  with the unambiguous interpretation that it is a vector of pointers to float.

* address spaces remain on the pointer, not the type:
    getelementptr float addrspace(1)* %x
  ->getelementptr float, float addrspace(1)* %x
  Then, eventually:
    getelementptr float, ptr addrspace(1) %x

Importantly, the massive amount of test case churn has been automated by
same crappy python code. I had to manually update a few test cases that
wouldn't fit the script's model (r228970,r229196,r229197,r229198). The
python script just massages stdin and writes the result to stdout, I
then wrapped that in a shell script to handle replacing files, then
using the usual find+xargs to migrate all the files.

update.py:
import fileinput
import sys
import re

ibrep = re.compile(r"(^.*?[^%\w]getelementptr inbounds )(((?:<\d* x )?)(.*?)(| addrspace\(\d\)) *\*(|>)(?:$| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$))")
normrep = re.compile(       r"(^.*?[^%\w]getelementptr )(((?:<\d* x )?)(.*?)(| addrspace\(\d\)) *\*(|>)(?:$| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$))")

def conv(match, line):
  if not match:
    return line
  line = match.groups()[0]
  if len(match.groups()[5]) == 0:
    line += match.groups()[2]
  line += match.groups()[3]
  line += ", "
  line += match.groups()[1]
  line += "\n"
  return line

for line in sys.stdin:
  if line.find("getelementptr ") == line.find("getelementptr inbounds"):
    if line.find("getelementptr inbounds") != line.find("getelementptr inbounds ("):
      line = conv(re.match(ibrep, line), line)
  elif line.find("getelementptr ") != line.find("getelementptr ("):
    line = conv(re.match(normrep, line), line)
  sys.stdout.write(line)

apply.sh:
for name in "$@"
do
  python3 `dirname "$0"`/update.py < "$name" > "$name.tmp" && mv "$name.tmp" "$name"
  rm -f "$name.tmp"
done

The actual commands:
From llvm/src:
find test/ -name *.ll | xargs ./apply.sh
From llvm/src/tools/clang:
find test/ -name *.mm -o -name *.m -o -name *.cpp -o -name *.c | xargs -I '{}' ../../apply.sh "{}"
From llvm/src/tools/polly:
find test/ -name *.ll | xargs ./apply.sh

After that, check-all (with llvm, clang, clang-tools-extra, lld,
compiler-rt, and polly all checked out).

The extra 'rm' in the apply.sh script is due to a few files in clang's test
suite using interesting unicode stuff that my python script was throwing
exceptions on. None of those files needed to be migrated, so it seemed
sufficient to ignore those cases.

Reviewers: rafael, dexonsmith, grosser

Differential Revision: http://reviews.llvm.org/D7636

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230786 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-27 19:29:02 +00:00

144 lines
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; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -analyze -branch-prob | FileCheck %s
; Original C++ code for this test case:
;
; #include <stdio.h>
; #include <stdlib.h>
;
; int main(int argc, char *argv[]) {
; if (argc < 2)
; return 1;
; double result;
; int limit = atoi(argv[1]);
; if (limit > 100) {
; double s = 23.041968;
; for (int u = 0; u < limit; u++) {
; double x = s;
; s = x + 3.049 + (double)u;
; s -= s + 3.94 / x * 0.32;
; }
; result = s;
; } else {
; result = 0;
; }
; printf("result is %lf\n", result);
; return 0;
; }
@.str = private unnamed_addr constant [15 x i8] c"result is %lf\0A\00", align 1
; Function Attrs: nounwind uwtable
define i32 @main(i32 %argc, i8** nocapture readonly %argv) #0 {
; CHECK: Printing analysis 'Branch Probability Analysis' for function 'main':
entry:
tail call void @llvm.dbg.value(metadata i32 %argc, i64 0, metadata !13, metadata !{}), !dbg !27
tail call void @llvm.dbg.value(metadata i8** %argv, i64 0, metadata !14, metadata !{}), !dbg !27
%cmp = icmp slt i32 %argc, 2, !dbg !28
br i1 %cmp, label %return, label %if.end, !dbg !28
; CHECK: edge entry -> return probability is 1 / 2 = 50%
; CHECK: edge entry -> if.end probability is 1 / 2 = 50%
if.end: ; preds = %entry
%arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1, !dbg !30
%0 = load i8** %arrayidx, align 8, !dbg !30, !tbaa !31
%call = tail call i32 @atoi(i8* %0) #4, !dbg !30
tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !17, metadata !{}), !dbg !30
%cmp1 = icmp sgt i32 %call, 100, !dbg !35
br i1 %cmp1, label %for.body, label %if.end6, !dbg !35
; CHECK: edge if.end -> for.body probability is 1 / 2 = 50%
; CHECK: edge if.end -> if.end6 probability is 1 / 2 = 50%
for.body: ; preds = %if.end, %for.body
%u.016 = phi i32 [ %inc, %for.body ], [ 0, %if.end ]
%s.015 = phi double [ %sub, %for.body ], [ 0x40370ABE6A337A81, %if.end ]
%add = fadd double %s.015, 3.049000e+00, !dbg !36
%conv = sitofp i32 %u.016 to double, !dbg !36
%add4 = fadd double %add, %conv, !dbg !36
tail call void @llvm.dbg.value(metadata double %add4, i64 0, metadata !18, metadata !{}), !dbg !36
%div = fdiv double 3.940000e+00, %s.015, !dbg !37
%mul = fmul double %div, 3.200000e-01, !dbg !37
%add5 = fadd double %add4, %mul, !dbg !37
%sub = fsub double %add4, %add5, !dbg !37
tail call void @llvm.dbg.value(metadata double %sub, i64 0, metadata !18, metadata !{}), !dbg !37
%inc = add nsw i32 %u.016, 1, !dbg !38
tail call void @llvm.dbg.value(metadata i32 %inc, i64 0, metadata !21, metadata !{}), !dbg !38
%exitcond = icmp eq i32 %inc, %call, !dbg !38
br i1 %exitcond, label %if.end6, label %for.body, !dbg !38
; CHECK: edge for.body -> if.end6 probability is 1 / 10227 = 0.00977804
; CHECK: edge for.body -> for.body probability is 10226 / 10227 = 99.9902% [HOT edge]
if.end6: ; preds = %for.body, %if.end
%result.0 = phi double [ 0.000000e+00, %if.end ], [ %sub, %for.body ]
%call7 = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([15 x i8]* @.str, i64 0, i64 0), double %result.0), !dbg !39
br label %return, !dbg !40
; CHECK: edge if.end6 -> return probability is 16 / 16 = 100% [HOT edge]
return: ; preds = %entry, %if.end6
%retval.0 = phi i32 [ 0, %if.end6 ], [ 1, %entry ]
ret i32 %retval.0, !dbg !41
}
; Function Attrs: nounwind readonly
declare i32 @atoi(i8* nocapture) #1
; Function Attrs: nounwind
declare i32 @printf(i8* nocapture readonly, ...) #2
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3
attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readonly "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { nounwind readnone }
attributes #4 = { nounwind readonly }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!25, !42}
!llvm.ident = !{!26}
!0 = !{!"0x11\004\00clang version 3.4 (trunk 192896) (llvm/trunk 192895)\001\00\000\00\000", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [./branch.cc] [DW_LANG_C_plus_plus]
!1 = !{!"branch.cc", !"."}
!2 = !{i32 0}
!3 = !{!4}
!4 = !{!"0x2e\00main\00main\00\004\000\001\000\006\00256\001\004", !1, !5, !6, null, i32 (i32, i8**)* @main, null, null, !12} ; [ DW_TAG_subprogram ] [line 4] [def] [main]
!5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [./branch.cc]
!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = !{!8, !8, !9}
!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!9 = !{!"0xf\00\000\0064\0064\000\000", null, null, !10} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
!10 = !{!"0xf\00\000\0064\0064\000\000", null, null, !11} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from char]
!11 = !{!"0x24\00char\000\008\008\000\000\006", null, null} ; [ DW_TAG_base_type ] [char] [line 0, size 8, align 8, offset 0, enc DW_ATE_signed_char]
!12 = !{!13, !14, !15, !17, !18, !21, !23}
!13 = !{!"0x101\00argc\0016777220\000", !4, !5, !8} ; [ DW_TAG_arg_variable ] [argc] [line 4]
!14 = !{!"0x101\00argv\0033554436\000", !4, !5, !9} ; [ DW_TAG_arg_variable ] [argv] [line 4]
!15 = !{!"0x100\00result\007\000", !4, !5, !16} ; [ DW_TAG_auto_variable ] [result] [line 7]
!16 = !{!"0x24\00double\000\0064\0064\000\000\004", null, null} ; [ DW_TAG_base_type ] [double] [line 0, size 64, align 64, offset 0, enc DW_ATE_float]
!17 = !{!"0x100\00limit\008\000", !4, !5, !8} ; [ DW_TAG_auto_variable ] [limit] [line 8]
!18 = !{!"0x100\00s\0010\000", !19, !5, !16} ; [ DW_TAG_auto_variable ] [s] [line 10]
!19 = !{!"0xb\009\000\000", !1, !20} ; [ DW_TAG_lexical_block ] [./branch.cc]
!20 = !{!"0xb\009\000\000", !1, !4} ; [ DW_TAG_lexical_block ] [./branch.cc]
!21 = !{!"0x100\00u\0011\000", !22, !5, !8} ; [ DW_TAG_auto_variable ] [u] [line 11]
!22 = !{!"0xb\0011\000\000", !1, !19} ; [ DW_TAG_lexical_block ] [./branch.cc]
!23 = !{!"0x100\00x\0012\000", !24, !5, !16} ; [ DW_TAG_auto_variable ] [x] [line 12]
!24 = !{!"0xb\0011\000\000", !1, !22} ; [ DW_TAG_lexical_block ] [./branch.cc]
!25 = !{i32 2, !"Dwarf Version", i32 4}
!26 = !{!"clang version 3.4 (trunk 192896) (llvm/trunk 192895)"}
!27 = !MDLocation(line: 4, scope: !4)
!28 = !MDLocation(line: 5, scope: !29)
!29 = !{!"0xb\005\000\000", !1, !4} ; [ DW_TAG_lexical_block ] [./branch.cc]
!30 = !MDLocation(line: 8, scope: !4)
!31 = !{!32, !32, i64 0}
!32 = !{!"any pointer", !33, i64 0}
!33 = !{!"omnipotent char", !34, i64 0}
!34 = !{!"Simple C/C++ TBAA"}
!35 = !MDLocation(line: 9, scope: !20)
!36 = !MDLocation(line: 13, scope: !24)
!37 = !MDLocation(line: 14, scope: !24)
!38 = !MDLocation(line: 11, scope: !22)
!39 = !MDLocation(line: 20, scope: !4)
!40 = !MDLocation(line: 21, scope: !4)
!41 = !MDLocation(line: 22, scope: !4)
!42 = !{i32 1, !"Debug Info Version", i32 2}
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