The testcase: --cut here-- #include <stdio.h>
double __attribute__ ((noinline)) test (double x) { return x >= 0.0 ? x : -x; } double __attribute__ ((always_inline)) test_inlined (double x) { return x >= 0.0 ? x : -x; } int main() { double x = -0.0; printf ("%f %f %f\n", x, test(x), test_inlined(x)); return 0; } --cut here-- gcc -O2 abs.c ./a.out -0.000000 0.000000 -0.000000 -- Summary: Different results for inlined vs. non-inlined function Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: ubizjak at gmail dot com GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35456