You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
41 lines
1.4 KiB
41 lines
1.4 KiB
; RUN: opt -S -licm -o - %s | FileCheck %s
|
|
;
|
|
; Be sure that we don't hoist loads incorrectly if a loop has conditional UB.
|
|
; See PR36228.
|
|
|
|
declare void @check(i8)
|
|
declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i32, i1)
|
|
|
|
; CHECK-LABEL: define void @buggy
|
|
define void @buggy(i8* %src, i1* %kOne) {
|
|
entry:
|
|
%dst = alloca [1 x i8], align 1
|
|
%0 = getelementptr inbounds [1 x i8], [1 x i8]* %dst, i64 0, i64 0
|
|
store i8 42, i8* %0, align 1
|
|
%src16 = bitcast i8* %src to i16*
|
|
%srcval = load i16, i16* %src16
|
|
br label %while.cond
|
|
|
|
while.cond: ; preds = %if.end, %entry
|
|
%dp.0 = phi i8* [ %0, %entry ], [ %dp.1, %if.end ]
|
|
%1 = load volatile i1, i1* %kOne, align 4
|
|
br i1 %1, label %if.else, label %if.then
|
|
|
|
if.then: ; preds = %while.cond
|
|
store i8 9, i8* %dp.0, align 1
|
|
br label %if.end
|
|
|
|
if.else: ; preds = %while.cond
|
|
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dp.0, i8* %src, i64 2, i32 1, i1 false)
|
|
%dp.new = getelementptr inbounds i8, i8* %dp.0, i64 1
|
|
br label %if.end
|
|
|
|
if.end: ; preds = %if.else, %if.then
|
|
%dp.1 = phi i8* [ %dp.0, %if.then ], [ %dp.new, %if.else ]
|
|
; CHECK: %2 = load i8, i8* %0
|
|
%2 = load i8, i8* %0, align 1
|
|
; CHECK-NEXT: call void @check(i8 %2)
|
|
call void @check(i8 %2)
|
|
br label %while.cond
|
|
}
|