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tcg-ppc64: Tidy register allocation order

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Remove conditionalization from tcg_target_reg_alloc_order, relying on
reserved_regs to prevent register allocation that shouldn't happen.
So R11 is now present in reg_alloc_order for __APPLE__, but also now
reserved.

Sort reg_alloc_order into call-saved, call-clobbered, and parameters.
This reduces the effect of values getting spilled and reloaded before
function calls.

Whether or not it is reserved, R2 (TOC) is always call-clobbered.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-07-31 10:18:49 -07:00
parent b0940da012
commit 5e1702b074
1 changed files with 23 additions and 28 deletions
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51
tcg/ppc64/tcg-target.c
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@ -99,7 +99,7 @@ static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
#endif
static const int tcg_target_reg_alloc_order[] = {
TCG_REG_R14,
TCG_REG_R14, /* call saved registers */
TCG_REG_R15,
TCG_REG_R16,
TCG_REG_R17,
@ -109,29 +109,25 @@ static const int tcg_target_reg_alloc_order[] = {
TCG_REG_R21,
TCG_REG_R22,
TCG_REG_R23,
TCG_REG_R24,
TCG_REG_R25,
TCG_REG_R26,
TCG_REG_R27,
TCG_REG_R28,
TCG_REG_R29,
TCG_REG_R30,
TCG_REG_R31,
#ifdef __APPLE__
TCG_REG_R2,
#endif
TCG_REG_R3,
TCG_REG_R4,
TCG_REG_R5,
TCG_REG_R6,
TCG_REG_R7,
TCG_REG_R8,
TCG_REG_R9,
TCG_REG_R10,
#ifndef __APPLE__
TCG_REG_R12, /* call clobbered, non-arguments */
TCG_REG_R11,
#endif
TCG_REG_R12,
TCG_REG_R24,
TCG_REG_R25,
TCG_REG_R26,
TCG_REG_R27
TCG_REG_R2,
TCG_REG_R10, /* call clobbered, arguments */
TCG_REG_R9,
TCG_REG_R8,
TCG_REG_R7,
TCG_REG_R6,
TCG_REG_R5,
TCG_REG_R4,
TCG_REG_R3,
};
static const int tcg_target_call_iarg_regs[] = {
@ -2133,9 +2129,7 @@ static void tcg_target_init(TCGContext *s)
tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I64], 0, 0xffffffff);
tcg_regset_set32(tcg_target_call_clobber_regs, 0,
(1 << TCG_REG_R0) |
#ifdef __APPLE__
(1 << TCG_REG_R2) |
#endif
(1 << TCG_REG_R3) |
(1 << TCG_REG_R4) |
(1 << TCG_REG_R5) |
@ -2145,16 +2139,17 @@ static void tcg_target_init(TCGContext *s)
(1 << TCG_REG_R9) |
(1 << TCG_REG_R10) |
(1 << TCG_REG_R11) |
(1 << TCG_REG_R12)
);
(1 << TCG_REG_R12));
tcg_regset_clear(s->reserved_regs);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R0);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R1);
#ifndef __APPLE__
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R2);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R0); /* tcg temp */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R1); /* stack pointer */
#ifdef __APPLE__
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R11); /* ??? */
#else
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R2); /* toc */
#endif
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R13);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R13); /* thread pointer */
tcg_add_target_add_op_defs(ppc_op_defs);
}