http://llvm.org/bugs/show_bug.cgi?id=13704
Bug #: 13704
Summary: __int128 decrement is broken
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
% cat m128.cc
#include <stdio.h>
int main() {
__int128 x = 2;
x--;
printf("%lx %lx\n", ((long*)(&x))[0], ((long*)(&x))[1]);
}
with gcc 4.7:
% g++ m128.cc ; ./a.out
1 0
with clang r162550:
% clang m128.cc ; ./a.out
1 1
clang m128.cc -S -o - -emit-llvm
; ModuleID = 'm128.cc'
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@.str = private unnamed_addr constant [9 x i8] c"%lx %lx\0A\00", align 1
define i32 @main() uwtable {
entry:
%x = alloca i128, align 16
store i128 2, i128* %x, align 16
%0 = load i128* %x, align 16
%dec = add nsw i128 %0, 18446744073709551615 <<<<<<<<<<<<<<<<<
store i128 %dec, i128* %x, align 16
--
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
