30 lines
953 B
LLVM
30 lines
953 B
LLVM
; NOTE: Assertions have been autogenerated by update_test_checks.py
|
|
; Test merging of blocks that only have PHI nodes in them
|
|
;
|
|
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
|
|
;
|
|
|
|
define i32 @test(i1 %a, i1 %b) {
|
|
; CHECK-LABEL: @test(
|
|
; CHECK: M:
|
|
; CHECK-NEXT: [[DOT:%.*]] = select i1 %b, i32 0, i32 1
|
|
; CHECK-NEXT: [[W:%.*]] = select i1 %a, i32 2, i32 [[DOT]]
|
|
; CHECK-NEXT: [[R:%.*]] = add i32 [[W]], 1
|
|
; CHECK-NEXT: ret i32 [[R]]
|
|
;
|
|
br i1 %a, label %M, label %O
|
|
O: ; preds = %0
|
|
br i1 %b, label %N, label %Q
|
|
Q: ; preds = %O
|
|
br label %N
|
|
N: ; preds = %Q, %O
|
|
; This block should be foldable into M
|
|
%Wp = phi i32 [ 0, %O ], [ 1, %Q ] ; <i32> [#uses=1]
|
|
br label %M
|
|
M: ; preds = %N, %0
|
|
%W = phi i32 [ %Wp, %N ], [ 2, %0 ] ; <i32> [#uses=1]
|
|
%R = add i32 %W, 1 ; <i32> [#uses=1]
|
|
ret i32 %R
|
|
}
|
|
|