mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-03 14:21:30 +00:00
8566963713
which branch on undef to branch on a boolean constant for the edge exiting the loop. This helps ScalarEvolution compute trip counts for loops. Teach ScalarEvolution to recognize single-value PHIs, when safe, and ForgetSymbolicName to forget such single-value PHI nodes as apprpriate in ForgetSymbolicName. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97126 91177308-0d34-0410-b5e6-96231b3b80d8
16 lines
437 B
LLVM
16 lines
437 B
LLVM
; RUN: opt < %s -indvars -S | grep indvar
|
|
|
|
define i32 @test() {
|
|
; <label>:0
|
|
br i1 true, label %LoopHead, label %LoopHead
|
|
|
|
LoopHead: ; preds = %LoopHead, %0, %0
|
|
%A = phi i32 [ 7, %0 ], [ 7, %0 ], [ %B, %LoopHead ] ; <i32> [#uses=1]
|
|
%B = add i32 %A, 1 ; <i32> [#uses=2]
|
|
br i1 true, label %LoopHead, label %Out
|
|
|
|
Out: ; preds = %LoopHead
|
|
ret i32 %B
|
|
}
|
|
|