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target-sparc: Elide duplicate updates to fprs

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Backports commit f9c816c00cf4242542472ae6b2a579b11b7e86f1 from qemu
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Richard Henderson 2018-02-25 19:14:57 -05:00 committed by Lioncash
parent 2215ef7e21
commit d17dc29d2e
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 10 additions and 1 deletions
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11
qemu/target-sparc/translate.c
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@ -52,6 +52,7 @@ typedef struct DisasContext {
int n_t32; int n_t32;
int n_ttl; int n_ttl;
#ifdef TARGET_SPARC64 #ifdef TARGET_SPARC64
int fprs_dirty;
int asi; int asi;
#endif #endif
@ -118,7 +119,13 @@ static inline void gen_update_fprs_dirty(DisasContext *dc, int rd)
{ {
#if defined(TARGET_SPARC64) #if defined(TARGET_SPARC64)
TCGContext *tcg_ctx = dc->uc->tcg_ctx; TCGContext *tcg_ctx = dc->uc->tcg_ctx;
tcg_gen_ori_i32(tcg_ctx, tcg_ctx->cpu_fprs, tcg_ctx->cpu_fprs, (rd < 32) ? 1 : 2); int bit = (rd < 32) ? 1 : 2;
/* If we know we've already set this bit within the TB,
we can avoid setting it again. */
if (!(dc->fprs_dirty & bit)) {
dc->fprs_dirty |= bit;
tcg_gen_ori_i32(tcg_ctx, tcg_ctx->cpu_fprs, tcg_ctx->cpu_fprs, bit);
}
#endif #endif
} }
@ -4317,6 +4324,7 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn, bool hook_ins
case 0x6: /* V9 wrfprs */ case 0x6: /* V9 wrfprs */
tcg_gen_xor_tl(tcg_ctx, cpu_tmp0, cpu_src1, cpu_src2); tcg_gen_xor_tl(tcg_ctx, cpu_tmp0, cpu_src1, cpu_src2);
tcg_gen_trunc_tl_i32(tcg_ctx, tcg_ctx->cpu_fprs, cpu_tmp0); tcg_gen_trunc_tl_i32(tcg_ctx, tcg_ctx->cpu_fprs, cpu_tmp0);
dc->fprs_dirty = 0;
save_state(dc); save_state(dc);
gen_op_next_insn(dc); gen_op_next_insn(dc);
tcg_gen_exit_tb(tcg_ctx, 0); tcg_gen_exit_tb(tcg_ctx, 0);
@ -5764,6 +5772,7 @@ void gen_intermediate_code(CPUSPARCState * env, TranslationBlock * tb)
dc->address_mask_32bit = tb_am_enabled(tb->flags); dc->address_mask_32bit = tb_am_enabled(tb->flags);
dc->singlestep = (cs->singlestep_enabled); // || singlestep); dc->singlestep = (cs->singlestep_enabled); // || singlestep);
#ifdef TARGET_SPARC64 #ifdef TARGET_SPARC64
dc->fprs_dirty = 0;
dc->asi = (tb->flags >> TB_FLAG_ASI_SHIFT) & 0xff; dc->asi = (tb->flags >> TB_FLAG_ASI_SHIFT) & 0xff;
#endif #endif