Revision 1497c961 target-arm/op_helper.c
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "exec.h" |
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#include "helpers.h" |
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void raise_exception(int tt) |
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{
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env = saved_env; |
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} |
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#endif |
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#define SIGNBIT (uint32_t)0x80000000 |
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uint32_t HELPER(add_setq)(uint32_t a, uint32_t b) |
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{
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uint32_t res = a + b; |
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if (((res ^ a) & SIGNBIT) && !((a ^ b) & SIGNBIT)) |
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env->QF = 1; |
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return res; |
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} |
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uint32_t HELPER(add_saturate)(uint32_t a, uint32_t b) |
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{
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uint32_t res = a + b; |
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if (((res ^ a) & SIGNBIT) && !((a ^ b) & SIGNBIT)) {
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env->QF = 1; |
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res = ~(((int32_t)a >> 31) ^ SIGNBIT); |
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} |
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return res; |
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} |
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uint32_t HELPER(sub_saturate)(uint32_t a, uint32_t b) |
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{
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uint32_t res = a - b; |
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if (((res ^ a) & SIGNBIT) && ((a ^ b) & SIGNBIT)) {
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env->QF = 1; |
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res = ~(((int32_t)a >> 31) ^ SIGNBIT); |
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} |
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return res; |
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} |
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uint32_t HELPER(double_saturate)(int32_t val) |
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{
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uint32_t res; |
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if (val >= 0x40000000) {
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res = ~SIGNBIT; |
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env->QF = 1; |
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} else if (val <= (int32_t)0xc0000000) {
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res = SIGNBIT; |
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env->QF = 1; |
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} else {
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res = val << 1; |
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} |
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return res; |
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} |
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uint32_t HELPER(add_usaturate)(uint32_t a, uint32_t b) |
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{
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uint32_t res = a + b; |
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if (res < a) {
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env->QF = 1; |
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res = ~0; |
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} |
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return res; |
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} |
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uint32_t HELPER(sub_usaturate)(uint32_t a, uint32_t b) |
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{
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uint32_t res = a - b; |
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if (res > a) {
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env->QF = 1; |
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res = 0; |
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} |
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return res; |
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} |
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