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gcse.c (gcse_main): Fix comment typo. 

* gcse.c (gcse_main): Fix comment typo.
	(delete_null_pointer_check): Likewise.
	(hash_scan_set): Don't consider sets with REG_EQUIV MEM notes.
	* cse.c (cse_insn): Likewise.
	* function.c (fixup_var_refs_insns_with_hash): The sequence is
	toplevel.

	* gcc.c-torture/execute/20010403-1.c: New test.

From-SVN: r41444
This commit is contained in:
Jakub Jelinek 2001-04-20 09:56:50 +02:00 committed by Jakub Jelinek
parent 5c8378a7a2
commit 43e720723f
5 changed files with 31 additions and 13 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2001-04-20 Jakub Jelinek <jakub@redhat.com>
* gcse.c (gcse_main): Fix comment typo.
(delete_null_pointer_check): Likewise.
(hash_scan_set): Don't consider sets with REG_EQUIV MEM notes.
* cse.c (cse_insn): Likewise.
* function.c (fixup_var_refs_insns_with_hash): The sequence is
toplevel.
2001-04-19 Zack Weinberg <zackw@stanford.edu>
* toplev.c: Excise all code for the undocumented -dm option.

16
gcc/cse.c
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@ -5067,18 +5067,16 @@ cse_insn (insn, libcall_insn)
sets[i].src_in_memory = hash_arg_in_memory;
/* If SRC is a MEM, there is a REG_EQUIV note for SRC, and DEST is
a pseudo that is set more than once, do not record SRC. Using
SRC as a replacement for anything else will be incorrect in that
situation. Note that this usually occurs only for stack slots,
in which case all the RTL would be referring to SRC, so we don't
lose any optimization opportunities by not having SRC in the
hash table. */
a pseudo, do not record SRC. Using SRC as a replacement for
anything else will be incorrect in that situation. Note that
this usually occurs only for stack slots, in which case all the
RTL would be referring to SRC, so we don't lose any optimization
opportunities by not having SRC in the hash table. */
if (GET_CODE (src) == MEM
&& find_reg_note (insn, REG_EQUIV, src) != 0
&& find_reg_note (insn, REG_EQUIV, NULL_RTX) != 0
&& GET_CODE (dest) == REG
&& REGNO (dest) >= FIRST_PSEUDO_REGISTER
&& REG_N_SETS (REGNO (dest)) != 1)
&& REGNO (dest) >= FIRST_PSEUDO_REGISTER)
sets[i].src_volatile = 1;
#if 0

2
gcc/function.c
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@ -1682,7 +1682,7 @@ fixup_var_refs_insns_with_hash (ht, var, promoted_mode, unsignedp)
rtx insn = XEXP (insn_list, 0);
if (INSN_P (insn))
fixup_var_refs_insn (insn, var, promoted_mode, unsignedp, 0);
fixup_var_refs_insn (insn, var, promoted_mode, unsignedp, 1);
insn_list = XEXP (insn_list, 1);
}

13
gcc/gcse.c
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@ -756,7 +756,7 @@ gcse_main (f, file)
a high connectivity will take a long time and is unlikely to be
particularly useful.
In normal circumstances a cfg should have about twice has many edges
In normal circumstances a cfg should have about twice as many edges
as blocks. But we do not want to punish small functions which have
a couple switch statements. So we require a relatively large number
of basic blocks and the ratio of edges to blocks to be high. */
@ -2208,7 +2208,14 @@ hash_scan_set (pat, insn, set_p)
/* Is SET_SRC something we want to gcse? */
&& want_to_gcse_p (src)
/* Don't CSE a nop. */
&& ! set_noop_p (pat))
&& ! set_noop_p (pat)
/* Don't GCSE if it has attached REG_EQUIV note.
At this point this only function parameters should have
REG_EQUIV notes and if the argument slot is used somewhere
explicitely, it means address of parameter has been taken,
so we should not extend the lifetime of the pseudo. */
&& ((note = find_reg_note (insn, REG_EQUIV, NULL_RTX)) == 0
|| GET_CODE (XEXP (note, 0)) != MEM))
{
/* An expression is not anticipatable if its operands are
modified before this insn or if this is not the only SET in
@ -5541,7 +5548,7 @@ delete_null_pointer_checks (f)
a high connectivity will take a long time and is unlikely to be
particularly useful.
In normal circumstances a cfg should have about twice has many edges
In normal circumstances a cfg should have about twice as many edges
as blocks. But we do not want to punish small functions which have
a couple switch statements. So we require a relatively large number
of basic blocks and the ratio of edges to blocks to be high. */

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2001-04-20 Jakub Jelinek <jakub@redhat.com>
* gcc.c-torture/execute/20010403-1.c: New test.
2001-04-19 David Billinghurst <David.Billinghurst@riotinto.com>
Mark Mitchell <mark@codesourcery.com>