xref: /aosp_15_r20/external/llvm/test/CodeGen/X86/MachineBranchProb.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)

; 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({{[0-9a-fx/= ]+}}1.53%) BB#4({{[0-9a-fx/= ]+}}98.47%)
; CHECK: BB#4: derived from LLVM BB %for.cond2
; CHECK: Successors according to CFG: BB#3({{[0-9a-fx/= ]+}}1.55%) BB#2({{[0-9a-fx/= ]+}}98.45%)

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}