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tcg/arm: explicitely list clobbered/reserved regs

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Instead of writing very compact code, declare all registers that are
clobbered or reserved one by one. This makes the code easier to read.

Also declare all the 16 registers to TCG, and mark pc as reserved.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2010-04-09 20:52:48 +02:00
parent 39221a82be
commit e4a7d5e88c
2 changed files with 11 additions and 5 deletions
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13
tcg/arm/tcg-target.c
View file

@ -39,6 +39,7 @@ static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
"%r12",
"%r13",
"%r14",
"%pc",
};
#endif
@ -1580,15 +1581,19 @@ void tcg_target_init(TCGContext *s)
tcg_abort();
#endif
tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0,
((2 << TCG_REG_R14) - 1) & ~(1 << TCG_REG_R8));
tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0, 0xffff);
tcg_regset_set32(tcg_target_call_clobber_regs, 0,
((2 << TCG_REG_R3) - 1) |
(1 << TCG_REG_R12) | (1 << TCG_REG_R14));
(1 << TCG_REG_R0) |
(1 << TCG_REG_R1) |
(1 << TCG_REG_R2) |
(1 << TCG_REG_R3) |
(1 << TCG_REG_R12) |
(1 << TCG_REG_R14));
tcg_regset_clear(s->reserved_regs);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_CALL_STACK);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R8);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_PC);
tcg_add_target_add_op_defs(arm_op_defs);
}

3
tcg/arm/tcg-target.h
View file

@ -44,9 +44,10 @@ enum {
TCG_REG_R12,
TCG_REG_R13,
TCG_REG_R14,
TCG_REG_PC,
};
#define TCG_TARGET_NB_REGS 15
#define TCG_TARGET_NB_REGS 16
#define TCG_CT_CONST_ARM 0x100