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Fix suboptimal code generation bug in reload

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From-SVN: r31352
This commit is contained in:
Bernd Schmidt 2000-01-12 12:40:49 +00:00 committed by Bernd Schmidt
parent 02368d6dd4
commit 9e3a9cf21e
2 changed files with 14 additions and 7 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2000-01-12 Bernd Schmidt <bernds@cygnus.co.uk>
* reload1.c (reload_reg_unavailable): New static variable.
(reload_reg_free_p): Test it.
(reload_reg_free_for_value_p): Test it instead of
reload_reg_used.
(choose_reload_regs_init): Compute it.
Wed Jan 12 03:24:41 2000 Toshiyasu Morita (toshi.morita@sega.com)
* reorg.c (fill_slots_from_thread): Check modified_in_p

13
gcc/reload1.c
View File

@ -3990,6 +3990,8 @@ forget_old_reloads_1 (x, ignored, data)
/* The following HARD_REG_SETs indicate when each hard register is
used for a reload of various parts of the current insn. */
/* If reg is unavailable for all reloads. */
static HARD_REG_SET reload_reg_unavailable;
/* If reg is in use as a reload reg for a RELOAD_OTHER reload. */
static HARD_REG_SET reload_reg_used;
/* If reg is in use for a RELOAD_FOR_INPUT_ADDRESS reload for operand I. */
@ -4213,7 +4215,8 @@ reload_reg_free_p (regno, opnum, type)
int i;
/* In use for a RELOAD_OTHER means it's not available for anything. */
if (TEST_HARD_REG_BIT (reload_reg_used, regno))
if (TEST_HARD_REG_BIT (reload_reg_used, regno)
|| TEST_HARD_REG_BIT (reload_reg_unavailable, regno))
return 0;
switch (type)
@ -4617,11 +4620,7 @@ reload_reg_free_for_value_p (regno, opnum, type, value, out, reloadnum,
int i;
int copy = 0;
/* ??? reload_reg_used is abused to hold the registers that are not
available as spill registers, including hard registers that are
earlyclobbered in asms. As a temporary measure, reject anything
in reload_reg_used. */
if (TEST_HARD_REG_BIT (reload_reg_used, regno))
if (TEST_HARD_REG_BIT (reload_reg_unavailable, regno))
return 0;
if (out == const0_rtx)
@ -5064,7 +5063,7 @@ choose_reload_regs_init (chain, save_reload_reg_rtx)
CLEAR_HARD_REG_SET (reload_reg_used_in_outaddr_addr[i]);
}
IOR_COMPL_HARD_REG_SET (reload_reg_used, chain->used_spill_regs);
COMPL_HARD_REG_SET (reload_reg_unavailable, chain->used_spill_regs);
CLEAR_HARD_REG_SET (reload_reg_used_for_inherit);