https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107991
Bug ID: 107991
Summary: Extra mov instructions with ternary on x86
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: denis.campredon at gmail dot com
Target Milestone: ---
Compiled with -O2 on x86, gcc trunk produces 3 mov instructions for each of the
following functions:
int foo(bool b, int i, int j) {
return b ? i - j : i;
}
int bar(bool b, int i, int j) {
return i + (b ? -j : 0);
}
int baz(bool b, int i, int j) {
return i - (b ? j : 0);
}
-------------
Whearas with gcc 7.5, only 1 mov was produced for foo and bar, and two for baz
