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pa.c (output_cbranch, [...]): Output nop for conditional branch to the following instruction.

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* pa.c (output_cbranch, output_bb, output_bvb): Output nop for
	conditional branch to the following instruction.  Use next_real_insn
	instead of next_active_insn.
	(output_dbra, output_movb, jump_in_call_delay): Use next_real_insn
	instead of next_active_insn.

From-SVN: r64723
This commit is contained in:
John David Anglin 2003-03-22 18:53:08 +00:00 committed by John David Anglin
parent 97c6f7ad73
commit 02a57c739e
2 changed files with 26 additions and 13 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2003-03-22 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
* pa.c (output_cbranch, output_bb, output_bvb): Output nop for
conditional branch to the following instruction. Use next_real_insn
instead of next_active_insn.
(output_dbra, output_movb, jump_in_call_delay): Use next_real_insn
instead of next_active_insn.
2003-03-22 Ulrich Weigand <uweigand@de.ibm.com>
* config/s390/s390.md ("movti", "*movdi_31", "*movdf_31"): Use 'o' instead

31
gcc/config/pa/pa.c
View File

@ -5549,13 +5549,18 @@ output_cbranch (operands, nullify, length, negated, insn)
int useskip = 0;
rtx xoperands[5];
/* A conditional branch to the following instruction (eg the delay slot) is
asking for a disaster. This can happen when not optimizing.
/* A conditional branch to the following instruction (eg the delay slot)
is asking for a disaster. This can happen when not optimizing and
when jump optimization fails.
In such cases it is safe to emit nothing. */
While it usually safe to emit nothing, this can fail if the preceding
instruction is a nullified branch with an empty delay slot and the
same branch target as this branch. We could check for this but
jump optimization should eliminate these jumps. It is always
safe to emit a nop. */
if (next_active_insn (JUMP_LABEL (insn)) == next_active_insn (insn))
return "";
if (next_real_insn (JUMP_LABEL (insn)) == next_real_insn (insn))
return "nop";
/* If this is a long branch with its delay slot unfilled, set `nullify'
as it can nullify the delay slot and save a nop. */
@ -5851,8 +5856,8 @@ output_bb (operands, nullify, length, negated, insn, which)
is only used when optimizing; jump optimization should eliminate the
jump. But be prepared just in case. */
if (next_active_insn (JUMP_LABEL (insn)) == next_active_insn (insn))
return "";
if (next_real_insn (JUMP_LABEL (insn)) == next_real_insn (insn))
return "nop";
/* If this is a long branch with its delay slot unfilled, set `nullify'
as it can nullify the delay slot and save a nop. */
@ -5999,8 +6004,8 @@ output_bvb (operands, nullify, length, negated, insn, which)
is only used when optimizing; jump optimization should eliminate the
jump. But be prepared just in case. */
if (next_active_insn (JUMP_LABEL (insn)) == next_active_insn (insn))
return "";
if (next_real_insn (JUMP_LABEL (insn)) == next_real_insn (insn))
return "nop";
/* If this is a long branch with its delay slot unfilled, set `nullify'
as it can nullify the delay slot and save a nop. */
@ -6140,7 +6145,7 @@ output_dbra (operands, insn, which_alternative)
/* A conditional branch to the following instruction (eg the delay slot) is
asking for a disaster. Be prepared! */
if (next_active_insn (JUMP_LABEL (insn)) == next_active_insn (insn))
if (next_real_insn (JUMP_LABEL (insn)) == next_real_insn (insn))
{
if (which_alternative == 0)
return "ldo %1(%0),%0";
@ -6247,7 +6252,7 @@ output_movb (operands, insn, which_alternative, reverse_comparison)
/* A conditional branch to the following instruction (eg the delay slot) is
asking for a disaster. Be prepared! */
if (next_active_insn (JUMP_LABEL (insn)) == next_active_insn (insn))
if (next_real_insn (JUMP_LABEL (insn)) == next_real_insn (insn))
{
if (which_alternative == 0)
return "copy %1,%0";
@ -7585,9 +7590,9 @@ jump_in_call_delay (insn)
if (PREV_INSN (insn)
&& PREV_INSN (PREV_INSN (insn))
&& GET_CODE (next_active_insn (PREV_INSN (PREV_INSN (insn)))) == INSN)
&& GET_CODE (next_real_insn (PREV_INSN (PREV_INSN (insn)))) == INSN)
{
rtx test_insn = next_active_insn (PREV_INSN (PREV_INSN (insn)));
rtx test_insn = next_real_insn (PREV_INSN (PREV_INSN (insn)));
return (GET_CODE (PATTERN (test_insn)) == SEQUENCE
&& XVECEXP (PATTERN (test_insn), 0, 1) == insn);