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sh2 drc, small improvements and bug fixes for code emitters

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This commit is contained in:
kub 2019-11-19 21:59:44 +01:00
parent cf0dd6ae48
commit f2d19ddf2a
6 changed files with 194 additions and 83 deletions
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20
cpu/drc/emit_arm.c
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@ -478,6 +478,7 @@ static void emith_op_imm2(int cond, int s, int op, int rd, int rn, unsigned int
switch (op) {
case A_OP_MOV:
case A_OP_MVN:
rn = 0;
// use MVN if more bits 1 than 0
if (count_bits(imm) > 16) {
@ -501,7 +502,7 @@ static void emith_op_imm2(int cond, int s, int op, int rd, int rn, unsigned int
return;
}
#else
for (i = 2, u = v; i > 0; i--, u >>= 8)
for (i = 3, u = v; i > 0; i--, u >>= 8)
while (u > 0xff && !(u & 3))
u >>= 2;
if (u) { // 4 insns needed...
@ -1387,22 +1388,25 @@ static inline void emith_pool_adjust(int pool_index, int move_offs)
} while (0)
/*
* T = carry(Rn = (Rn << 1) | T)
* if Q
* t = carry(Rn += Rm)
* T ^= !carry(Rn += Rm)
* else
* t = carry(Rn -= Rm)
* T ^= t
* T ^= !carry(Rn -= Rm)
*/
#define emith_sh2_div1_step(rn, rm, sr) do { \
void *jmp0, *jmp1; \
emith_tpop_carry(sr, 0); /* Rn = 2*Rn+T */\
emith_adcf_r_r_r(rn, rn, rn); \
emith_tpush_carry(sr, 0); \
emith_tst_r_imm(sr, Q); /* if (Q ^ M) */ \
JMP_POS(jmp0); /* beq do_sub */ \
emith_addf_r_r(rn, rm); \
emith_eor_r_imm_c(A_COND_CS, sr, T); \
emith_addf_r_r(rn, rm); /* Rn += Rm */ \
emith_eor_r_imm_c(A_COND_CC, sr, T); \
JMP_POS(jmp1); /* b done */ \
JMP_EMIT(A_COND_EQ, jmp0); /* do_sub: */ \
emith_subf_r_r(rn, rm); \
emith_eor_r_imm_c(A_COND_CC, sr, T); \
emith_subf_r_r(rn, rm); /* Rn -= Rm */ \
emith_eor_r_imm_c(A_COND_CS, sr, T); \
JMP_EMIT(A_COND_AL, jmp1); /* done: */ \
} while (0)