File: MachineBranchProb.ll

package info (click to toggle)
llvm-toolchain-3.7 1%3A3.7.1-5
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 345,556 kB
  • ctags: 362,199
  • sloc: cpp: 2,156,381; ansic: 458,339; objc: 91,547; python: 89,988; asm: 86,305; sh: 21,479; makefile: 6,853; perl: 5,601; ml: 5,458; pascal: 3,933; lisp: 2,429; xml: 686; cs: 239; php: 202; csh: 117
file content (34 lines) | stat: -rw-r--r-- 1,303 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
; RUN: llc < %s -mtriple=x86_64-apple-darwin -print-machineinstrs=expand-isel-pseudos -o /dev/null 2>&1 | FileCheck %s

;; Make sure a transformation in SelectionDAGBuilder that converts "or + br" to
;; two branches correctly updates the branch probability.

@max_regno = common global i32 0, align 4

define void @test(i32* %old, i32 %final) {
for.cond:
  br label %for.cond2

for.cond2:                                        ; preds = %for.inc, %for.cond
  %i.1 = phi i32 [ %inc19, %for.inc ], [ 0, %for.cond ]
  %bit.0 = phi i32 [ %shl, %for.inc ], [ 1, %for.cond ]
  %tobool = icmp eq i32 %bit.0, 0
  %v3 = load i32, i32* @max_regno, align 4
  %cmp4 = icmp eq i32 %i.1, %v3
  %or.cond = or i1 %tobool, %cmp4
  br i1 %or.cond, label %for.inc20, label %for.inc, !prof !0
; CHECK: BB#1: derived from LLVM BB %for.cond2
; CHECK: Successors according to CFG: BB#3(56008718) BB#4(3615818718)
; CHECK: BB#4: derived from LLVM BB %for.cond2
; CHECK: Successors according to CFG: BB#3(56008718) BB#2(3559810000)

for.inc:                                          ; preds = %for.cond2
  %shl = shl i32 %bit.0, 1
  %inc19 = add nsw i32 %i.1, 1
  br label %for.cond2

for.inc20:                                        ; preds = %for.cond2
  ret void
}

!0 = !{!"branch_weights", i32 112017436, i32 -735157296}