Messages in this thread | | | Date | Wed, 4 May 2016 22:22:13 +0200 | From | Borislav Petkov <> | Subject | Re: [RFC PATCH] x86/hweight: Get rid of the special calling convention |
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On Wed, May 04, 2016 at 12:49:17PM -0700, H. Peter Anvin wrote: > Sigh. Doesn't look like -Wa is going to help due to the lack of the > equivalent of an -include option in gas.
So much for the register "freedom" - I'll resurrect the hardcoded insn bytes. :-\
Unless my gcc friends have some other ideas...
sarge:~# gcc --version gcc (GCC) 3.3.5 (Debian 1:3.3.5-13) Copyright (C) 2003 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
sarge:~# cat popcnt.c int main(void) { int a, b;
asm volatile("popcnt %0, %1" : "=r" (a) : "r" (b));
return 0; } sarge:~# gcc -Wall -o popcnt{,.c} /tmp/ccHmmgjH.s: Assembler messages: /tmp/ccHmmgjH.s:14: Error: no such instruction: `popcnt %eax,%eax' sarge:~#
-- Regards/Gruss, Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
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