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tcg-ppc: Use conditional branch and link to slow path 

Saves one insn per slow path.  Note that we can no longer use
a tail call into the store helper.

Signed-off-by: Richard Henderson <rth@twiddle.net>
master
Richard Henderson 2013-09-09 16:49:36 -07:00
parent 1d10cf9886
commit 5b1c985b7e
1 changed files with 10 additions and 5 deletions
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15
tcg/ppc/tcg-target.c
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@ -611,9 +611,14 @@ static void tcg_out_tlb_check (TCGContext *s, int r0, int r1, int r2,
tcg_out32 (s, CMP | BF (6) | RA (addr_reg2) | RB (r1));
tcg_out32 (s, CRAND | BT (7, CR_EQ) | BA (6, CR_EQ) | BB (7, CR_EQ));
#endif
/* Use a conditional branch-and-link so that we load a pointer to
somewhere within the current opcode, for passing on to the helper.
This address cannot be used for a tail call, but it's shorter
than forming an address from scratch. */
*label_ptr = s->code_ptr;
retranst = ((uint16_t *) s->code_ptr)[1] & ~3;
tcg_out32 (s, BC | BI (7, CR_EQ) | retranst | BO_COND_FALSE);
tcg_out32(s, BC | BI(7, CR_EQ) | retranst | BO_COND_FALSE | LK);
/* r0 now contains &env->tlb_table[mem_index][index].addr_x */
tcg_out32 (s, (LWZ
@ -853,7 +858,7 @@ static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
tcg_out_mov(s, TCG_TYPE_I32, ir++, l->addrlo_reg);
}
tcg_out_movi(s, TCG_TYPE_I32, ir++, l->mem_index);
tcg_out_movi(s, TCG_TYPE_PTR, ir, (uintptr_t)l->raddr);
tcg_out32(s, MFSPR | RT(ir++) | LR);
tcg_out_b(s, LK, (uintptr_t)ld_trampolines[l->opc & 3]);
datalo = l->datalo_reg;
@ -928,9 +933,9 @@ static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
ir++;
tcg_out_movi(s, TCG_TYPE_I32, ir++, l->mem_index);
tcg_out_movi(s, TCG_TYPE_PTR, ir, (uintptr_t)l->raddr);
tcg_out32(s, MTSPR | RS(ir) | LR);
tcg_out_b(s, 0, (uintptr_t)st_trampolines[l->opc]);
tcg_out32(s, MFSPR | RT(ir++) | LR);
tcg_out_b(s, LK, (uintptr_t)st_trampolines[l->opc]);
tcg_out_b(s, 0, (uintptr_t)l->raddr);
}
void tcg_out_tb_finalize(TCGContext *s)