https://llvm.org/bugs/show_bug.cgi?id=24353
Bug ID: 24353
Summary: Incorrect code generated with tail call
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: jbush...@gmail.com
CC: llvmbugs@cs.uiuc.edu
Classification: Unclassified
clang & llvm @243600
The following code:
#include <stdio.h>
static int function1() {
printf("B\n");
}
void function2() {
function1();
printf("C\n");
}
int main(int argc, const char *argv[]) {
function2();
}
Will go into infinite recursion and crash. When compiled with -O3, function2
generates the following. The function abruptly ends after the first puts call
(printf "B"), and there is no epilogue:
__Z9function2v: ## @_Z9function2v
.cfi_startproc
pushq %rbp
movq %rsp, %rbp
Ltmp2: leaq L_str.2(%rip), %rdi
callq _puts
.cfi_endproc
.globl _main
The LLVM IR has inserted an unreachable after the first inlined call to printf
for some reason:
define void @_Z9function2v() #0 {
entry:
%puts.i = tail call i32 @puts(i8* getelementptr inbounds ([2 x i8], [2 x i8]*
@str.2, i64 0, i64 0)) #1
unreachable
}
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