https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92140
Bug ID: 92140
Summary: clang vs gcc optimizing with adc/sbb
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: hermantenbrugge at home dot nl
Target Milestone: ---
The following code:
extern char table[];
extern int c, v;
void tst1 (void) { v += table[c] != 0; }
void tst2 (void) { v -= table[c] != 0; }
unsigned int tst3 (unsigned int n) { return n ? 2 : 1; }
compiled with gcc and clang see some optimizing opportunities for gcc.
Table with instruction generated:
gcc clang
tst1: 5 3
tst2: 5 3
tst3: 4 3
This is with:
gcc (GCC) 10.0.0 20191017 (experimental)
clang version 10.0.0 (trunk 373843)
