motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-03 07:43:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

target-sparc: Move taddcctv and tsubcctv out of line

Browse source 
The branches around the exception are maintaining an otherwise
unnecessary use of local temps for the cpu destination.

Note that gen_op_t{add,sub}_cc were identical to gen_op_{add,sub}_cc.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Henderson 2012-10-05 16:55:05 -07:00 • committed by Blue Swirl
parent bd49ed41eb
commit a2ea4aa989
3 changed files with 66 additions and 102 deletions
Download patch file Download diff file Expand all files Collapse all files

58
target-sparc/helper.c
View file

@ -167,3 +167,61 @@ uint64_t helper_udivx(CPUSPARCState *env, uint64_t a, uint64_t b)
return a / b;
}
#endif
target_ulong helper_taddcctv(CPUSPARCState *env, target_ulong src1,
target_ulong src2)
{
target_ulong dst;
/* Tag overflow occurs if either input has bits 0 or 1 set. */
if ((src1 | src2) & 3) {
goto tag_overflow;
}
dst = src1 + src2;
/* Tag overflow occurs if the addition overflows. */
if (~(src1 ^ src2) & (src1 ^ dst) & (1u << 31)) {
goto tag_overflow;
}
/* Only modify the CC after any exceptions have been generated. */
env->cc_op = CC_OP_TADDTV;
env->cc_src = src1;
env->cc_src2 = src2;
env->cc_dst = dst;
return dst;
tag_overflow:
cpu_restore_state2(env, GETPC());
helper_raise_exception(env, TT_TOVF);
}
target_ulong helper_tsubcctv(CPUSPARCState *env, target_ulong src1,
target_ulong src2)
{
target_ulong dst;
/* Tag overflow occurs if either input has bits 0 or 1 set. */
if ((src1 | src2) & 3) {
goto tag_overflow;
}
dst = src1 - src2;
/* Tag overflow occurs if the subtraction overflows. */
if ((src1 ^ src2) & (src1 ^ dst) & (1u << 31)) {
goto tag_overflow;
}
/* Only modify the CC after any exceptions have been generated. */
env->cc_op = CC_OP_TSUBTV;
env->cc_src = src1;
env->cc_src2 = src2;
env->cc_dst = dst;
return dst;
tag_overflow:
cpu_restore_state2(env, GETPC());
helper_raise_exception(env, TT_TOVF);
}