https://llvm.org/bugs/show_bug.cgi?id=25873
Bug ID: 25873
Summary: Assignment of structure being optimized out
Product: clang
Version: trunk
Hardware: All
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: sunil_srivast...@playstation.sony.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Following example shows a wrong optimization with current trunk (r255918)
#include <stdio.h>
struct point {
float x, y;
public:
point() { x = 0.0f; y = 0.0f; }
};
struct p2 {
point a, b;
public:
p2(): a(), b() {}
};
int main() {
p2 p,q;
q.a.x = 1.0f;
q.a.y = 2.0f;
q.b = q.a; // set q.b to same as q.a
p = q; // hence p.a must be same as p.b
printf( "p.a=( %f, %f ), p.b=( %f, %f )\n", p.a.x, p.a.y, p.b.x, p.b.y );
}
with -O, it gives
p.a=( 1.000000, 2.000000 ), p.b=( 0.000000, 0.000000 )
I have tried it on linux/pc, but I think other platforms have same issue.
It is a regression. 3.5 did not have this bug. I will pin down further as to
when it happened.
The problem does not show if x and y are ints.
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
