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re PR rtl-optimization/53908 (csa removes needed memory load) 

PR rtl-optimization/53908
	* df-problems.c (can_move_insns_across): When doing
	memory-reference book-keeping, handle call insns.

Co-Authored-By: Bernd Schmidt <bernds@codesourcery.com>
Co-Authored-By: Steven Bosscher <steven@gcc.gnu.org>

From-SVN: r189468
This commit is contained in:
Richard Sandiford 2012-07-13 17:21:41 +00:00 committed by Hans-Peter Nilsson
parent c4180e5f31
commit 0acdd1e392
2 changed files with 21 additions and 0 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2012-07-13 Richard Sandiford <rdsandiford@googlemail.com>
Steven Bosscher <steven@gcc.gnu.org>
Bernd Schmidt <bernds@codesourcery.com>
PR rtl-optimization/53908
* df-problems.c (can_move_insns_across): When doing
memory-reference book-keeping, handle call insns.
2012-07-10 Uros Bizjak <ubizjak@gmail.com>
Backport from mainline

13
gcc/df-problems.c
View File

@ -3961,6 +3961,19 @@ can_move_insns_across (rtx from, rtx to, rtx across_from, rtx across_to,
for (insn = across_to; ; insn = next)
{
if (CALL_P (insn))
{
if (RTL_CONST_OR_PURE_CALL_P (insn))
/* Pure functions can read from memory. Const functions can
read from arguments that the ABI has forced onto the stack.
Neither sort of read can be volatile. */
memrefs_in_across |= MEMREF_NORMAL;
else
{
memrefs_in_across |= MEMREF_VOLATILE;
mem_sets_in_across |= MEMREF_VOLATILE;
}
}
if (NONDEBUG_INSN_P (insn))
{
memrefs_in_across |= for_each_rtx (&PATTERN (insn), find_memory,