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target/sh4: get rid of DELAY_SLOT_CLEARME 

Now that ctx->flags has been split, it becomes clear that
DELAY_SLOT_CLEARME has not impact on the code generation: in both case
ctx->envflags is cleared, either by clearing all the flags, or by
setting it to 0. This is left-over from pre-TCG era.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2017-05-01 23:20:43 +02:00
parent a6215749dc
commit 3968260811
3 changed files with 6 additions and 16 deletions
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3
target/sh4/cpu.h
View File

@ -93,7 +93,6 @@
#define DELAY_SLOT (1 << 0)
#define DELAY_SLOT_CONDITIONAL (1 << 1)
#define DELAY_SLOT_TRUE (1 << 2)
#define DELAY_SLOT_CLEARME (1 << 3)
/* The dynamic value of the DELAY_SLOT_TRUE flag determines whether the jump
* after the delay slot should be taken or not. It is calculated from SR_T.
*
@ -384,7 +383,7 @@ static inline void cpu_get_tb_cpu_state(CPUSH4State *env, target_ulong *pc,
*pc = env->pc;
*cs_base = 0;
*flags = (env->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL
| DELAY_SLOT_TRUE | DELAY_SLOT_CLEARME)) /* Bits 0- 3 */
| DELAY_SLOT_TRUE)) /* Bits 0- 2 */
| (env->fpscr & (FPSCR_FR | FPSCR_SZ | FPSCR_PR)) /* Bits 19-21 */
| (env->sr & ((1u << SR_MD) | (1u << SR_RB))) /* Bits 29-30 */
| (env->sr & (1u << SR_FD)) /* Bit 15 */

2
target/sh4/helper.c
View File

@ -170,8 +170,6 @@ void superh_cpu_do_interrupt(CPUState *cs)
/* Clear flags for exception/interrupt routine. */
env->flags &= ~(DELAY_SLOT | DELAY_SLOT_CONDITIONAL | DELAY_SLOT_TRUE);
}
if (env->flags & DELAY_SLOT_CLEARME)
env->flags = 0;
if (do_exp) {
env->expevt = cs->exception_index;

17
target/sh4/translate.c
View File

@ -1804,15 +1804,9 @@ static void decode_opc(DisasContext * ctx)
_decode_opc(ctx);
if (old_flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL)) {
if (ctx->envflags & DELAY_SLOT_CLEARME) {
gen_store_flags(0);
} else {
/* go out of the delay slot */
uint32_t new_flags = ctx->envflags;
new_flags &= ~(DELAY_SLOT | DELAY_SLOT_CONDITIONAL);
gen_store_flags(new_flags);
}
ctx->envflags = 0;
/* go out of the delay slot */
ctx->envflags &= ~(DELAY_SLOT | DELAY_SLOT_CONDITIONAL);
gen_store_flags(ctx->envflags);
ctx->bstate = BS_BRANCH;
if (old_flags & DELAY_SLOT_CONDITIONAL) {
gen_delayed_conditional_jump(ctx);
@ -1840,8 +1834,7 @@ void gen_intermediate_code(CPUSH4State * env, struct TranslationBlock *tb)
pc_start = tb->pc;
ctx.pc = pc_start;
ctx.tbflags = (uint32_t)tb->flags;
ctx.envflags = tb->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL |
DELAY_SLOT_CLEARME);
ctx.envflags = tb->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL);
ctx.bstate = BS_NONE;
ctx.memidx = (ctx.tbflags & (1u << SR_MD)) == 0 ? 1 : 0;
/* We don't know if the delayed pc came from a dynamic or static branch,
@ -1908,7 +1901,7 @@ void gen_intermediate_code(CPUSH4State * env, struct TranslationBlock *tb)
/* fall through */
case BS_NONE:
if (ctx.envflags) {
gen_store_flags(ctx.envflags | DELAY_SLOT_CLEARME);
gen_store_flags(ctx.envflags);
}
gen_goto_tb(&ctx, 0, ctx.pc);
break;