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cse.c (delete_trivially_dead_insns): Delete the libcall block when return value is unused. 

* cse.c (delete_trivially_dead_insns): Delete the libcall block
	when return value is unused.

From-SVN: r44112
This commit is contained in:
Jan Hubicka 2001-07-18 18:36:33 +02:00 committed by Jan Hubicka
parent 222f7ba9a4
commit f06fbeea0d
2 changed files with 32 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Wed Jul 18 18:35:01 CEST 2001 Jan Hubicka <jh@suse.cz>
* cse.c (delete_trivially_dead_insns): Delete the libcall block
when return value is unused.
Wed Jul 18 18:28:16 CEST 2001 Jan Hubicka <jh@suse.cz>
* gcse.c (pre_insert_copy_insn): Call update_ld_motion_stores.

32
gcc/cse.c
View File

@ -7488,7 +7488,7 @@ count_reg_usage (x, counts, dest, incr)
static bool
set_live_p (set, insn, counts)
rtx set;
rtx insn;
rtx insn ATTRIBUTE_UNUSED;
int *counts;
{
#ifdef HAVE_cc0
@ -7630,8 +7630,19 @@ delete_trivially_dead_insns (insns, nreg, preserve_basic_blocks)
if (find_reg_note (insn, REG_RETVAL, NULL_RTX))
{
in_libcall = 1;
live_insn = 1;
dead_libcall = dead_libcall_p (insn);
/* If the insn storing return value is dead, whole libcall is dead.
Otherwise attempt to eliminate libcall by doing an direct
operation. */
if (!insn_live_p (insn, counts))
{
live_insn = 0;
dead_libcall = 1;
}
else
{
live_insn = 1;
dead_libcall = dead_libcall_p (insn);
}
}
else if (in_libcall)
live_insn = ! dead_libcall;
@ -7671,8 +7682,19 @@ delete_trivially_dead_insns (insns, nreg, preserve_basic_blocks)
if (find_reg_note (insn, REG_RETVAL, NULL_RTX))
{
in_libcall = 1;
live_insn = 1;
dead_libcall = dead_libcall_p (insn);
/* If the insn storing return value is dead, whole libcall is dead.
Otherwise attempt to eliminate libcall by doing an direct
operation. */
if (!insn_live_p (insn, counts))
{
live_insn = 0;
dead_libcall = 1;
}
else
{
live_insn = 1;
dead_libcall = dead_libcall_p (insn);
}
}
else if (in_libcall)
live_insn = ! dead_libcall;