https://bugs.llvm.org/show_bug.cgi?id=50474
Bug ID: 50474
Summary: wrong code caused by "-early-cse -instsimplify
-jump-threading -constraint-elimination"
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 24889
--> https://bugs.llvm.org/attachment.cgi?id=24889&action=edit
small.bc
$clang -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
d56729b4a4393da9c65bdfe762b51f8b7b0ce0ca)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/oscar/compiler/llvm-project/build/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64
$gcc small.c && ./a.out
$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
$opt -early-cse -instsimplify -jump-threading -constraint-elimination small.bc
-o small-opt.bc
$clang small-opt.bc && ./a.out
hello!
---------------------------------------
#include<stdio.h>
char a;
void main() {
int b = a ?: a;
if (b)
printf("hello!\n");
}
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
