[LLVMbugs] [Bug 5105] New: -O2 causes llvm/ clang to truncate the value passed to malloc
bugzilla-daemon at cs.uiuc.edu
bugzilla-daemon at cs.uiuc.edu
Wed Sep 30 04:54:24 PDT 2009
http://llvm.org/bugs/show_bug.cgi?id=5105
Summary: -O2 causes llvm/clang to truncate the value passed to
malloc
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: critical
Priority: P2
Component: LLVM Codegen
AssignedTo: unassignedclangbugs at nondot.org
ReportedBy: js-llvm-bugzilla at webkeks.org
CC: llvmbugs at cs.uiuc.edu
This is on an AMD64 system.
llvm revision: 83146
asgard:/tmp$ cat test.c
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main()
{
printf("%p\n", malloc(SIZE_MAX));
return 0;
}
asgard:/tmp$ clang -S test.c -o test.S
asgard:/tmp$ clang -S -O2 test.c -o test.O2.S
asgard:/tmp$ cat test.S
[…]
movabsq $-1, %rax
movq %rax, %rdi
call malloc
[…]
asgard:/tmp$ cat test.O2.S
[…]
movl $4294967295, %edi
call malloc
[…]
For some reason, llvm/clang truncates the value to 32 bits if -O2 is specified.
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