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| author | Richard Henderson <rth@twiddle.net> | 2013-02-16 12:46:59 -0800 |
|---|---|---|
| committer | Blue Swirl <blauwirbel@gmail.com> | 2013-02-17 14:28:57 +0000 |
| commit | f540166b7dfdf4ec2057ac322d8cbfd0691e1d65 (patch) | |
| tree | 9ed4b3eed2a58ad4c14ec8e728fedf70bbb4d905 /util | |
| parent | be96bd3fbffde908a392c830c856063e122791c1 (diff) | |
| download | qemu-f540166b7dfdf4ec2057ac322d8cbfd0691e1d65.tar.gz qemu-f540166b7dfdf4ec2057ac322d8cbfd0691e1d65.tar.bz2 qemu-f540166b7dfdf4ec2057ac322d8cbfd0691e1d65.zip | |
host-utils: Use __int128_t for mul[us]64
Replace some x86_64 specific inline assembly with something that
all 64-bit hosts ought to optimize well. At worst this becomes
a call to the gcc __multi3 routine, which is no worse than our
implementation in util/host-utils.c.
With gcc 4.7, we get identical code generation for x86_64. We
now get native multiplication on ia64 and s390x hosts. With minor
improvements to gcc we can get it for ppc64 as well.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Diffstat (limited to 'util')
| -rw-r--r-- | util/host-utils.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/util/host-utils.c b/util/host-utils.c index 5e3915abba..2d06a2cb78 100644 --- a/util/host-utils.c +++ b/util/host-utils.c @@ -30,7 +30,7 @@ //#define DEBUG_MULDIV /* Long integer helpers */ -#if !defined(__x86_64__) +#ifndef CONFIG_INT128 static void add128 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) { *plow += a; @@ -102,4 +102,4 @@ void muls64 (uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b) a, b, *phigh, *plow); #endif } -#endif /* !defined(__x86_64__) */ +#endif /* !CONFIG_INT128 */ |