llvm/test/Transforms/SampleProfile/propagate.ll

; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/propagate.prof | opt -analyze -branch-prob | FileCheck %s

; Original C++ code for this test case:
;
; #include <stdio.h>
;
; long foo(int x, int y, long N) {
;   if (x < y) {
;     return y - x;
;   } else {
;     for (long i = 0; i < N; i++) {
;       if (i > N / 3)
;         x--;
;       if (i > N / 4) {
;         y++;
;         x += 3;
;       } else {
;         for (unsigned j = 0; j < i; j++) {
;           x += j;
;           y -= 3;
;         }
;       }
;     }
;   }
;   return y * x;
; }
;
; int main() {
;   int x = 5678;
;   int y = 1234;
;   long N = 999999;
;   printf("foo(%d, %d, %ld) = %ld\n", x, y, N, foo(x, y, N));
;   return 0;
; }

; ModuleID = 'propagate.cc'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@.str = private unnamed_addr constant [24 x i8] c"foo(%d, %d, %ld) = %ld\0A\00", align 1

; Function Attrs: nounwind uwtable
define i64 @_Z3fooiil(i32 %x, i32 %y, i64 %N) #0 {
entry:
  %retval = alloca i64, align 8
  %x.addr = alloca i32, align 4
  %y.addr = alloca i32, align 4
  %N.addr = alloca i64, align 8
  %i = alloca i64, align 8
  %j = alloca i32, align 4
  store i32 %x, i32* %x.addr, align 4
  store i32 %y, i32* %y.addr, align 4
  store i64 %N, i64* %N.addr, align 8
  %0 = load i32* %x.addr, align 4, !dbg !11
  %1 = load i32* %y.addr, align 4, !dbg !11
  %cmp = icmp slt i32 %0, %1, !dbg !11
  br i1 %cmp, label %if.then, label %if.else, !dbg !11

if.then:                                          ; preds = %entry
  %2 = load i32* %y.addr, align 4, !dbg !13
  %3 = load i32* %x.addr, align 4, !dbg !13
  %sub = sub nsw i32 %2, %3, !dbg !13
  %conv = sext i32 %sub to i64, !dbg !13
  store i64 %conv, i64* %retval, !dbg !13
  br label %return, !dbg !13

if.else:                                          ; preds = %entry
  store i64 0, i64* %i, align 8, !dbg !15
  br label %for.cond, !dbg !15

for.cond:                                         ; preds = %for.inc16, %if.else
  %4 = load i64* %i, align 8, !dbg !15
  %5 = load i64* %N.addr, align 8, !dbg !15
  %cmp1 = icmp slt i64 %4, %5, !dbg !15
  br i1 %cmp1, label %for.body, label %for.end18, !dbg !15
; CHECK: edge for.cond -> for.body probability is 10 / 11 = 90.9091% [HOT edge]
; CHECK: edge for.cond -> for.end18 probability is 1 / 11 = 9.09091%

for.body:                                         ; preds = %for.cond
  %6 = load i64* %i, align 8, !dbg !18
  %7 = load i64* %N.addr, align 8, !dbg !18
  %div = sdiv i64 %7, 3, !dbg !18
  %cmp2 = icmp sgt i64 %6, %div, !dbg !18
  br i1 %cmp2, label %if.then3, label %if.end, !dbg !18
; CHECK: edge for.body -> if.then3 probability is 1 / 5 = 20%
; CHECK: edge for.body -> if.end probability is 4 / 5 = 80%

if.then3:                                         ; preds = %for.body
  %8 = load i32* %x.addr, align 4, !dbg !21
  %dec = add nsw i32 %8, -1, !dbg !21
  store i32 %dec, i32* %x.addr, align 4, !dbg !21
  br label %if.end, !dbg !21

if.end:                                           ; preds = %if.then3, %for.body
  %9 = load i64* %i, align 8, !dbg !22
  %10 = load i64* %N.addr, align 8, !dbg !22
  %div4 = sdiv i64 %10, 4, !dbg !22
  %cmp5 = icmp sgt i64 %9, %div4, !dbg !22
  br i1 %cmp5, label %if.then6, label %if.else7, !dbg !22
; CHECK: edge if.end -> if.then6 probability is 3 / 6342 = 0.0473037%
; CHECK: edge if.end -> if.else7 probability is 6339 / 6342 = 99.9527% [HOT edge]

if.then6:                                         ; preds = %if.end
  %11 = load i32* %y.addr, align 4, !dbg !24
  %inc = add nsw i32 %11, 1, !dbg !24
  store i32 %inc, i32* %y.addr, align 4, !dbg !24
  %12 = load i32* %x.addr, align 4, !dbg !26
  %add = add nsw i32 %12, 3, !dbg !26
  store i32 %add, i32* %x.addr, align 4, !dbg !26
  br label %if.end15, !dbg !27

if.else7:                                         ; preds = %if.end
  store i32 0, i32* %j, align 4, !dbg !28
  br label %for.cond8, !dbg !28

for.cond8:                                        ; preds = %for.inc, %if.else7
  %13 = load i32* %j, align 4, !dbg !28
  %conv9 = zext i32 %13 to i64, !dbg !28
  %14 = load i64* %i, align 8, !dbg !28
  %cmp10 = icmp slt i64 %conv9, %14, !dbg !28
  br i1 %cmp10, label %for.body11, label %for.end, !dbg !28
; CHECK: edge for.cond8 -> for.body11 probability is 16191 / 16192 = 99.9938% [HOT edge]
; CHECK: edge for.cond8 -> for.end probability is 1 / 16192 = 0.00617589%

for.body11:                                       ; preds = %for.cond8
  %15 = load i32* %j, align 4, !dbg !31
  %16 = load i32* %x.addr, align 4, !dbg !31
  %add12 = add i32 %16, %15, !dbg !31
  store i32 %add12, i32* %x.addr, align 4, !dbg !31
  %17 = load i32* %y.addr, align 4, !dbg !33
  %sub13 = sub nsw i32 %17, 3, !dbg !33
  store i32 %sub13, i32* %y.addr, align 4, !dbg !33
  br label %for.inc, !dbg !34

for.inc:                                          ; preds = %for.body11
  %18 = load i32* %j, align 4, !dbg !28
  %inc14 = add i32 %18, 1, !dbg !28
  store i32 %inc14, i32* %j, align 4, !dbg !28
  br label %for.cond8, !dbg !28

for.end:                                          ; preds = %for.cond8
  br label %if.end15

if.end15:                                         ; preds = %for.end, %if.then6
  br label %for.inc16, !dbg !35

for.inc16:                                        ; preds = %if.end15
  %19 = load i64* %i, align 8, !dbg !15
  %inc17 = add nsw i64 %19, 1, !dbg !15
  store i64 %inc17, i64* %i, align 8, !dbg !15
  br label %for.cond, !dbg !15

for.end18:                                        ; preds = %for.cond
  br label %if.end19

if.end19:                                         ; preds = %for.end18
  %20 = load i32* %y.addr, align 4, !dbg !36
  %21 = load i32* %x.addr, align 4, !dbg !36
  %mul = mul nsw i32 %20, %21, !dbg !36
  %conv20 = sext i32 %mul to i64, !dbg !36
  store i64 %conv20, i64* %retval, !dbg !36
  br label %return, !dbg !36

return:                                           ; preds = %if.end19, %if.then
  %22 = load i64* %retval, !dbg !37
  ret i64 %22, !dbg !37
}

; Function Attrs: uwtable
define i32 @main() #1 {
entry:
  %retval = alloca i32, align 4
  %x = alloca i32, align 4
  %y = alloca i32, align 4
  %N = alloca i64, align 8
  store i32 0, i32* %retval
  store i32 5678, i32* %x, align 4, !dbg !38
  store i32 1234, i32* %y, align 4, !dbg !39
  store i64 999999, i64* %N, align 8, !dbg !40
  %0 = load i32* %x, align 4, !dbg !41
  %1 = load i32* %y, align 4, !dbg !41
  %2 = load i64* %N, align 8, !dbg !41
  %3 = load i32* %x, align 4, !dbg !41
  %4 = load i32* %y, align 4, !dbg !41
  %5 = load i64* %N, align 8, !dbg !41
  %call = call i64 @_Z3fooiil(i32 %3, i32 %4, i64 %5), !dbg !41
  %call1 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([24 x i8]* @.str, i32 0, i32 0), i32 %0, i32 %1, i64 %2, i64 %call), !dbg !41
  ret i32 0, !dbg !42
}

declare i32 @printf(i8*, ...) #2

attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!8, !9}
!llvm.ident = !{!10}

!0 = !{!"0x11\004\00clang version 3.5 \000\00\000\00\000", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [propagate.cc] [DW_LANG_C_plus_plus]
!1 = !{!"propagate.cc", !"."}
!2 = !{i32 0}
!3 = !{!4, !7}
!4 = !{!"0x2e\00foo\00foo\00\003\000\001\000\006\00256\000\003", !1, !5, !6, null, i64 (i32, i32, i64)* @_Z3fooiil, null, null, !2} ; [ DW_TAG_subprogram ] [line 3] [def] [foo]
!5 = !{!"0x29", !1}          ; [ DW_TAG_file_type ] [propagate.cc]
!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !2, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = !{!"0x2e\00main\00main\00\0024\000\001\000\006\00256\000\0024", !1, !5, !6, null, i32 ()* @main, null, null, !2} ; [ DW_TAG_subprogram ] [line 24] [def] [main]
!8 = !{i32 2, !"Dwarf Version", i32 4}
!9 = !{i32 1, !"Debug Info Version", i32 2}
!10 = !{!"clang version 3.5 "}
!11 = !{i32 4, i32 0, !12, null}
!12 = !{!"0xb\004\000\000", !1, !4} ; [ DW_TAG_lexical_block ] [propagate.cc]
!13 = !{i32 5, i32 0, !14, null}
!14 = !{!"0xb\004\000\000", !1, !12} ; [ DW_TAG_lexical_block ] [propagate.cc]
!15 = !{i32 7, i32 0, !16, null}
!16 = !{!"0xb\007\000\000", !1, !17} ; [ DW_TAG_lexical_block ] [propagate.cc]
!17 = !{!"0xb\006\000\000", !1, !12} ; [ DW_TAG_lexical_block ] [propagate.cc]
!18 = !{i32 8, i32 0, !19, null}
!19 = !{!"0xb\008\000\000", !1, !20} ; [ DW_TAG_lexical_block ] [propagate.cc]
!20 = !{!"0xb\007\000\000", !1, !16} ; [ DW_TAG_lexical_block ] [propagate.cc]
!21 = !{i32 9, i32 0, !19, null}
!22 = !{i32 10, i32 0, !23, null}
!23 = !{!"0xb\0010\000\000", !1, !20} ; [ DW_TAG_lexical_block ] [propagate.cc]
!24 = !{i32 11, i32 0, !25, null}
!25 = !{!"0xb\0010\000\000", !1, !23} ; [ DW_TAG_lexical_block ] [propagate.cc]
!26 = !{i32 12, i32 0, !25, null}
!27 = !{i32 13, i32 0, !25, null}
!28 = !{i32 14, i32 0, !29, null}
!29 = !{!"0xb\0014\000\000", !1, !30} ; [ DW_TAG_lexical_block ] [propagate.cc]
!30 = !{!"0xb\0013\000\000", !1, !23} ; [ DW_TAG_lexical_block ] [propagate.cc]
!31 = !{i32 15, i32 0, !32, null}
!32 = !{!"0xb\0014\000\000", !1, !29} ; [ DW_TAG_lexical_block ] [propagate.cc]
!33 = !{i32 16, i32 0, !32, null}
!34 = !{i32 17, i32 0, !32, null}
!35 = !{i32 19, i32 0, !20, null}
!36 = !{i32 21, i32 0, !4, null}
!37 = !{i32 22, i32 0, !4, null}
!38 = !{i32 25, i32 0, !7, null}
!39 = !{i32 26, i32 0, !7, null}
!40 = !{i32 27, i32 0, !7, null}
!41 = !{i32 28, i32 0, !7, null}
!42 = !{i32 29, i32 0, !7, null}