mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-26 13:36:28 +00:00
a4fde8485d
present in the bottom of the CFG triangle, as the transformation isn't ever valuable if the branch can't be eliminated. Also, unify some heuristics between SimplifyCFG's multiple if-converters, for consistency. This fixes rdar://10627242. llvm-svn: 147630
40 lines
1.5 KiB
LLVM
40 lines
1.5 KiB
LLVM
; RUN: opt -simplifycfg -S < %s | FileCheck %s
|
|
|
|
; It's not worthwhile to if-convert one of the phi nodes and leave
|
|
; the other behind, because that still requires a branch. If
|
|
; SimplifyCFG if-converts one of the phis, it should do both.
|
|
|
|
; CHECK: %div.high.addr.0 = select i1 %cmp1, i32 %div, i32 %high.addr.0
|
|
; CHECK-NEXT: %low.0.add2 = select i1 %cmp1, i32 %low.0, i32 %add2
|
|
; CHECK-NEXT: br label %while.cond
|
|
|
|
define i32 @upper_bound(i32* %r, i32 %high, i32 %k) nounwind {
|
|
entry:
|
|
br label %while.cond
|
|
|
|
while.cond: ; preds = %if.then, %if.else, %entry
|
|
%high.addr.0 = phi i32 [ %high, %entry ], [ %div, %if.then ], [ %high.addr.0, %if.else ]
|
|
%low.0 = phi i32 [ 0, %entry ], [ %low.0, %if.then ], [ %add2, %if.else ]
|
|
%cmp = icmp ult i32 %low.0, %high.addr.0
|
|
br i1 %cmp, label %while.body, label %while.end
|
|
|
|
while.body: ; preds = %while.cond
|
|
%add = add i32 %low.0, %high.addr.0
|
|
%div = udiv i32 %add, 2
|
|
%idxprom = zext i32 %div to i64
|
|
%arrayidx = getelementptr inbounds i32* %r, i64 %idxprom
|
|
%0 = load i32* %arrayidx
|
|
%cmp1 = icmp ult i32 %k, %0
|
|
br i1 %cmp1, label %if.then, label %if.else
|
|
|
|
if.then: ; preds = %while.body
|
|
br label %while.cond
|
|
|
|
if.else: ; preds = %while.body
|
|
%add2 = add i32 %div, 1
|
|
br label %while.cond
|
|
|
|
while.end: ; preds = %while.cond
|
|
ret i32 %low.0
|
|
}
|