https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70421
--- Comment #3 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Jakub Jelinek from comment #2)
> Untested fix:
> --- gcc/config/i386/i386.c (revision 234449)
> +++ gcc/config/i386/i386.c (working copy)
> @@ -46930,7 +46930,7 @@ half:
> {
> tmp = gen_reg_rtx (mode);
> emit_insn (gen_rtx_SET (tmp, gen_rtx_VEC_DUPLICATE (mode, val)));
> - emit_insn (gen_blendm (target, tmp, target,
> + emit_insn (gen_blendm (target, target, tmp,
> force_reg (mmode,
> gen_int_mode (1 << elt, mmode))));
> }
Thanks, that fixes the testcase and some other miscompiles. I haven't run the
testsuite though.
Is the fact that the useless cast in:
x ^= ((v16si)v)[u[0]];
changes the generated code (makes it significantly worse at all opt levels)
worth creating a PR?
