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re PR debug/41353 (VTA missed-debug issues)

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PR debug/41353
* regmove.c (regmove_backward_pass): Replace src with dst in the
debug insn, and check for dst before rather than after.

From-SVN: r152573
This commit is contained in:
Alexandre Oliva 2009-10-08 19:20:22 +00:00 committed by Alexandre Oliva
parent 42ccb89075
commit 968e57283e
2 changed files with 22 additions and 11 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2009-10-08 Alexandre Oliva <aoliva@redhat.com>
PR debug/41353
* regmove.c (regmove_backward_pass): Replace src with dst in the
debug insn, and check for dst before rather than after.
2009-10-08 Janis Johnson <janis187@us.ibm.com>
* config/rs6000/rs6000.c (rs6000_delegitimize_address): Remove.

27
gcc/regmove.c
View File

@ -1117,18 +1117,16 @@ regmove_backward_pass (void)
break;
}
/* We can't make this change if SRC is read or
/* We can't make this change if DST is mentioned at
all in P, since we are going to change its value.
We can't make this change if SRC is read or
partially written in P, since we are going to
eliminate SRC. We can't make this change
if DST is mentioned at all in P,
since we are going to change its value. */
if (reg_overlap_mentioned_p (src, PATTERN (p)))
{
if (DEBUG_INSN_P (p))
validate_replace_rtx_group (dst, src, insn);
else
break;
}
eliminate SRC. However, if it's a debug insn, we
can't refrain from making the change, for this
would cause codegen differences, so instead we
invalidate debug expressions that reference DST,
and adjust references to SRC in them so that they
become references to DST. */
if (reg_mentioned_p (dst, PATTERN (p)))
{
if (DEBUG_INSN_P (p))
@ -1137,6 +1135,13 @@ regmove_backward_pass (void)
else
break;
}
if (reg_overlap_mentioned_p (src, PATTERN (p)))
{
if (DEBUG_INSN_P (p))
validate_replace_rtx_group (src, dst, p);
else
break;
}
/* If we have passed a call instruction, and the
pseudo-reg DST is not already live across a call,