Patch to enable build on s390x
marc.glisse at inria.fr
Sat Sep 17 17:07:42 CEST 2011
On Fri, 16 Sep 2011, Andreas Krebbel wrote:
>> Do these systems support a 32-bit ABI? If they do, the compiler
>> should have an option controlling ABI. Please try it, using something
>> trivial like hello.c.
> Yes. The toolchain for System z supports 2 differents ABIs:
> -m31 for 32 bit GPRs, 31 bit addressing - s390 <-- machine id (uname -r)
> -m64 for 64 bit GPRs, 64 bit addressing - s390x
Does something like this work (ie doesn't change anything on s390, works
on s390x and with ABI=32 works like s390 on s390x)?
--- a/configure.in Sun Aug 21 20:08:38 2011 +0200
+++ b/configure.in Sat Sep 17 16:45:31 2011 +0200
@@ -1119,6 +1119,13 @@
+ case $host_cpu in
+ abilist="64 32"
+ gcc_32_cflags="$gcc_cflags -m31"
(just trying to help you write the patch, and not tested in any way)
>> What 64-bit multiply support do these system provide? The 32-bit s390
>> systems have a signed 32x32->64 bit multiply. GMP really needs a
>> 64x64->128 bit multiply, preferably unsigned, to support the s390x
> s390x has unsigned 64x64 -> 128 integer multiplication in a reg, reg and a reg, mem
> variant. The instructions are mlgr and mlg.
Cool. So umul_ppmm shouldn't be hard to write in longlong.h?
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