Hi Rainer,
It turns out that the FMA3 and FMA4 tests in acinclude.m4 don't test
what they claim to: if one compiles the test program
float
flt_mul_add (float a, float b, float c)
{
return __builtin_fmaf (a, b, c);
}
with -O2 -mfma -mno-fma4 (FMA3) resp. -O2 -mfma4 -mno-fma (FMA4), both
boil done to
flt_mul_add:
jmp fmaf
so the test always succeeds.
The following patch fixes this by instead using the tests from
gcc.target/i386/i386.exp. While the FMA3 test still passes with
/bin/as, the FMA4 one fails, avoiding the breakage.
Bootstrapped on i386-pc-solaris2.12 with both as and gas without
regressions.
Ok for mainline?
OK, and thanks a lot for the patch!
I hope this is the last fallout from the AMD patchess...
Regards
Thomas
