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hw/apic.c: use __builtin funtions instead of assembly code

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Suggested by malc.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5465 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-10-12 00:53:17 +00:00
parent 7d01998021
commit e95f5491bc
1 changed files with 8 additions and 10 deletions
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18
hw/apic.c
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@ -104,15 +104,14 @@ static void apic_init_ipi(APICState *s);
static void apic_set_irq(APICState *s, int vector_num, int trigger_mode);
static void apic_update_irq(APICState *s);
/* Find first bit starting from msb. Return 0 if value = 0 */
/* Find first bit starting from msb */
static int fls_bit(uint32_t value)
{
#if defined(__GNUC__)
return 31 - __builtin_clz(value);
#else
unsigned int ret = 0;
#if defined(HOST_I386) || defined(HOST_X86_64)
__asm__ __volatile__ ("bsr %1, %0\n" : "+r" (ret) : "rm" (value));
return ret;
#else
if (value > 0xffff)
value >>= 16, ret = 16;
if (value > 0xff)
@ -125,15 +124,14 @@ static int fls_bit(uint32_t value)
#endif
}
/* Find first bit starting from lsb. Return 0 if value = 0 */
/* Find first bit starting from lsb */
static int ffs_bit(uint32_t value)
{
#if defined(__GNUC__)
return __builtin_ffs(value) - 1;
#else
unsigned int ret = 0;
#if defined(HOST_I386) || defined(HOST_X86_64)
__asm__ __volatile__ ("bsf %1, %0\n" : "+r" (ret) : "rm" (value));
return ret;
#else
if (!value)
return 0;
if (!(value & 0xffff))