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tcg-ia64: Fix some register usage issues. 

(1) The output registers were not marked call-clobbered, even though
    they can be modified by called functions.
(2) The thread pointer was not marked reserved.
(3) R4-R6 are call-saved, but not saved by the prologue.  Rather than
    save them, mark them reserved so that we don't use them.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
master
Richard Henderson 2010-05-06 08:50:43 -07:00 committed by Aurelien Jarno
parent 4b31713dc4
commit 7221f058a6
1 changed files with 42 additions and 25 deletions
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67
tcg/ia64/tcg-target.c
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@ -2282,39 +2282,56 @@ void tcg_target_init(TCGContext *s)
0xffffffffffffffffull);
tcg_regset_set(tcg_target_available_regs[TCG_TYPE_I64],
0xffffffffffffffffull);
tcg_regset_set(tcg_target_call_clobber_regs,
(1 << TCG_REG_R8) |
(1 << TCG_REG_R9) |
(1 << TCG_REG_R10) |
(1 << TCG_REG_R11) |
(1 << TCG_REG_R13) |
(1 << TCG_REG_R14) |
(1 << TCG_REG_R15) |
(1 << TCG_REG_R16) |
(1 << TCG_REG_R17) |
(1 << TCG_REG_R18) |
(1 << TCG_REG_R19) |
(1 << TCG_REG_R20) |
(1 << TCG_REG_R21) |
(1 << TCG_REG_R22) |
(1 << TCG_REG_R23) |
(1 << TCG_REG_R24) |
(1 << TCG_REG_R25) |
(1 << TCG_REG_R26) |
(1 << TCG_REG_R27) |
(1 << TCG_REG_R28) |
(1 << TCG_REG_R29) |
(1 << TCG_REG_R30) |
(1 << TCG_REG_R31));
tcg_regset_clear(s->reserved_regs);
tcg_regset_clear(tcg_target_call_clobber_regs);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R8);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R9);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R10);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R11);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R14);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R15);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R16);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R17);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R18);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R19);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R20);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R21);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R22);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R23);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R24);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R25);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R26);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R27);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R28);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R29);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R30);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R31);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R56);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R57);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R58);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R59);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R60);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R61);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R62);
tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R63);
tcg_regset_clear(s->reserved_regs);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R0); /* zero register */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R1); /* global pointer */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R2); /* internal use */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R3); /* internal use */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R12); /* stack pointer */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R13); /* thread pointer */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R32); /* return address */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R33); /* PFS */
/* The following 3 are not in use, are call-saved, but *not* saved
by the prologue. Therefore we cannot use them without modifying
the prologue. There doesn't seem to be any good reason to use
these as opposed to the windowed registers. */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R4);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R5);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R6);
tcg_add_target_add_op_defs(ia64_op_defs);
}