blob: e7be89b60ebf257368d5f63fef410e925ba52c16 [file] [log] [blame]
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
; a, b;
; fn1() {
; if (b)
; if (a == 0 || a == 5)
; return a;
; return 0;
; }
; Checking that we handle correctly the case when we have a switch
; branching multiple times to the same block
@b = common global i32 0, align 4
@a = common global i32 0, align 4
; Function Attrs: nounwind
define i32 @fn1() {
; CHECK-LABEL: @fn1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr @b, align 4
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0
; CHECK-NEXT: br i1 [[TOBOOL]], label [[RETURN:%.*]], label [[IF_THEN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: [[TMP1:%.*]] = load i32, ptr @a, align 4
; CHECK-NEXT: [[SWITCH_SELECTCMP:%.*]] = icmp eq i32 [[TMP1]], 0
; CHECK-NEXT: [[SWITCH_SELECT:%.*]] = select i1 [[SWITCH_SELECTCMP]], i32 0, i32 0
; CHECK-NEXT: [[SWITCH_SELECTCMP1:%.*]] = icmp eq i32 [[TMP1]], 5
; CHECK-NEXT: [[SWITCH_SELECT2:%.*]] = select i1 [[SWITCH_SELECTCMP1]], i32 5, i32 [[SWITCH_SELECT]]
; CHECK-NEXT: br label [[RETURN]]
; CHECK: return:
; CHECK-NEXT: [[RETVAL_0:%.*]] = phi i32 [ [[SWITCH_SELECT2]], [[IF_THEN]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: ret i32 [[RETVAL_0]]
;
entry:
%0 = load i32, ptr @b, align 4
%tobool = icmp eq i32 %0, 0
br i1 %tobool, label %if.end3, label %if.then
if.then:
%1 = load i32, ptr @a, align 4
switch i32 %1, label %if.end3 [
i32 5, label %return
i32 0, label %return
]
if.end3:
br label %return
return:
%retval.0 = phi i32 [ 0, %if.end3 ], [ %1, %if.then ], [ %1, %if.then ]
ret i32 %retval.0
}