openkylin
/
qemu
mirror of https://gitee.com/openkylin/qemu.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

target-sparc: Remove gen_opc_jump_pc 

Since jump_pc[1] is always npc + 4, we can infer after incrementing
that jump_pc[1] == pc + 4.  Because of that, we can encode the branch
destination into a single word, and store that in npc.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-08-31 13:24:44 -07:00
parent 2bf2e019ed
commit 6c42444f9a
1 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
target-sparc/translate.c
View File

@ -65,7 +65,6 @@ static TCGv cpu_wim;
static TCGv_i64 cpu_fpr[TARGET_DPREGS];
static target_ulong gen_opc_npc[OPC_BUF_SIZE];
static target_ulong gen_opc_jump_pc[2];
#include "exec/gen-icount.h"
@ -5250,6 +5249,10 @@ static inline void gen_intermediate_code_internal(SPARCCPU *cpu,
tcg_ctx.gen_opc_instr_start[lj++] = 0;
tcg_ctx.gen_opc_pc[lj] = dc->pc;
gen_opc_npc[lj] = dc->npc;
if (dc->npc & JUMP_PC) {
assert(dc->jump_pc[1] == dc->pc + 4);
gen_opc_npc[lj] = dc->jump_pc[0] | JUMP_PC;
}
tcg_ctx.gen_opc_instr_start[lj] = 1;
tcg_ctx.gen_opc_icount[lj] = num_insns;
}
@ -5321,8 +5324,6 @@ static inline void gen_intermediate_code_internal(SPARCCPU *cpu,
#if 0
log_page_dump();
#endif
gen_opc_jump_pc[0] = dc->jump_pc[0];
gen_opc_jump_pc[1] = dc->jump_pc[1];
} else {
tb->size = last_pc + 4 - pc_start;
tb->icount = num_insns;
@ -5450,17 +5451,17 @@ void gen_intermediate_code_init(CPUSPARCState *env)
void restore_state_to_opc(CPUSPARCState *env, TranslationBlock *tb, int pc_pos)
{
target_ulong npc;
env->pc = tcg_ctx.gen_opc_pc[pc_pos];
target_ulong pc, npc;
env->pc = pc = tcg_ctx.gen_opc_pc[pc_pos];
npc = gen_opc_npc[pc_pos];
if (npc == 1) {
if (npc == DYNAMIC_PC) {
/* dynamic NPC: already stored */
} else if (npc == 2) {
} else if (npc & JUMP_PC) {
/* jump PC: use 'cond' and the jump targets of the translation */
if (env->cond) {
env->npc = gen_opc_jump_pc[0];
env->npc = npc & ~3;
} else {
env->npc = gen_opc_jump_pc[1];
env->npc = pc + 4;
}
} else {
env->npc = npc;