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* [Bug tree-optimization/105621] New: [13 Regression] Wrong code with -O3
@ 2022-05-16 19:03 vsevolod.livinskiy at gmail dot com
2022-05-17 6:58 ` [Bug tree-optimization/105621] " rguenth at gcc dot gnu.org
2022-05-17 10:50 ` marxin at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: vsevolod.livinskiy at gmail dot com @ 2022-05-16 19:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105621
Bug ID: 105621
Summary: [13 Regression] Wrong code with -O3
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: vsevolod.livinskiy at gmail dot com
Target Milestone: ---
Link to the Compiler Explorer: https://godbolt.org/z/jscK4bTP6
Reproducer:
#include <stdio.h>
unsigned short a = (unsigned short)31272;
int b = -1902905271;
unsigned int c = 1618489477U;
bool d = (bool)0;
void test(unsigned short a, int b, unsigned c) __attribute__((noipa));
void test(unsigned short a, int b, unsigned c) {
for (int i = 2; i < 24; i += 3)
d = b ? a ? c : 2086607777901731118 : 0;
}
int main() {
test(a, b, c);
printf("%d\n", (int)d);
if (d != 1)
__builtin_abort();
}
Error:
>$ g++ -O2 driver.cpp && ./a.out
1
>$ g++ -O3 driver.cpp && ./a.out
0
Aborted (core dumped)
GCC version 13.0.0 20220516 (69c4b5c519f0df37e4903992644cc29682721bc1)
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-05-16 19:03 [Bug tree-optimization/105621] New: [13 Regression] Wrong code with -O3 vsevolod.livinskiy at gmail dot com
2022-05-17 6:58 ` [Bug tree-optimization/105621] " rguenth at gcc dot gnu.org
2022-05-17 10:50 ` marxin at gcc dot gnu.org
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