motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-04 08:13:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

ARM TCG conversion 7/16.

Browse source 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4144 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2008-03-31 03:46:33 +00:00
parent 3670669ce2
commit 6ddbc6e4cf
7 changed files with 554 additions and 447 deletions
Download patch file Download diff file Expand all files Collapse all files

67
target-arm/op_helper.c
View file

@ -369,3 +369,70 @@ uint32_t HELPER(sub_usaturate)(uint32_t a, uint32_t b)
return res;
}
/* Signed saturation. */
static inline uint32_t do_ssat(int32_t val, int shift)
{
int32_t top;
uint32_t mask;
shift = PARAM1;
top = val >> shift;
mask = (1u << shift) - 1;
if (top > 0) {
env->QF = 1;
return mask;
} else if (top < -1) {
env->QF = 1;
return ~mask;
}
return val;
}
/* Unsigned saturation. */
static inline uint32_t do_usat(int32_t val, int shift)
{
uint32_t max;
shift = PARAM1;
max = (1u << shift) - 1;
if (val < 0) {
env->QF = 1;
return 0;
} else if (val > max) {
env->QF = 1;
return max;
}
return val;
}
/* Signed saturate. */
uint32_t HELPER(ssat)(uint32_t x, uint32_t shift)
{
return do_ssat(x, shift);
}
/* Dual halfword signed saturate. */
uint32_t HELPER(ssat16)(uint32_t x, uint32_t shift)
{
uint32_t res;
res = (uint16_t)do_ssat((int16_t)x, shift);
res |= do_ssat(((int32_t)x) >> 16, shift) << 16;
return res;
}
/* Unsigned saturate. */
uint32_t HELPER(usat)(uint32_t x, uint32_t shift)
{
return do_usat(x, shift);
}
/* Dual halfword unsigned saturate. */
uint32_t HELPER(usat16)(uint32_t x, uint32_t shift)
{
uint32_t res;
res = (uint16_t)do_usat((int16_t)x, shift);
res |= do_usat(((int32_t)x) >> 16, shift) << 16;
return res;
}