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jump.c (jump_optimize, [...]): Disable some optimizations when flag_test_coverage and there is a line number...

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* jump.c (jump_optimize, follow_jumps, mark_jump_label): Disable some
 	optimizations when flag_test_coverage and there is a line number note
 	in the way.
	(invert_jump): Add REG_BR_PROB when flag_branch_probabililties.

From-SVN: r13817
This commit is contained in:
Doug Evans 1997-03-28 22:37:37 +00:00
parent 9b53bc830d
commit f6a6a1b37d
1 changed files with 38 additions and 6 deletions
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44
gcc/jump.c
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@ -1869,9 +1869,21 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
&& (next_active_insn (JUMP_LABEL (insn))
== next_active_insn (JUMP_LABEL (temp))))
{
delete_jump (insn);
changed = 1;
continue;
rtx tem = temp;
/* ??? Optional. Disables some optimizations, but makes
gcov output more accurate with -O. */
if (flag_test_coverage && !reload_completed)
for (tem = insn; tem != temp; tem = NEXT_INSN (tem))
if (GET_CODE (tem) == NOTE && NOTE_LINE_NUMBER (tem) > 0)
break;
if (tem == temp)
{
delete_jump (insn);
changed = 1;
continue;
}
}
/* Detect a conditional jump jumping over an unconditional jump. */
@ -3219,7 +3231,10 @@ follow_jumps (label)
if (!reload_completed)
for (tem = value; tem != insn; tem = NEXT_INSN (tem))
if (GET_CODE (tem) == NOTE
&& NOTE_LINE_NUMBER (tem) == NOTE_INSN_LOOP_BEG)
&& (NOTE_LINE_NUMBER (tem) == NOTE_INSN_LOOP_BEG
/* ??? Optional. Disables some optimizations, but makes
gcov output more accurate with -O. */
|| (flag_test_coverage && NOTE_LINE_NUMBER (tem) > 0)))
return value;
/* If we have found a cycle, make the insn jump to itself. */
@ -3340,7 +3355,10 @@ mark_jump_label (x, insn, cross_jump)
break;
else if (! cross_jump
&& (NOTE_LINE_NUMBER (next) == NOTE_INSN_LOOP_BEG
|| NOTE_LINE_NUMBER (next) == NOTE_INSN_FUNCTION_END))
|| NOTE_LINE_NUMBER (next) == NOTE_INSN_FUNCTION_END
/* ??? Optional. Disables some optimizations, but
makes gcov output more accurate with -O. */
|| (flag_test_coverage && NOTE_LINE_NUMBER (next) > 0)))
break;
}
@ -3755,7 +3773,21 @@ invert_jump (jump, nlabel)
return 0;
if (redirect_jump (jump, nlabel))
return 1;
{
if (flag_branch_probabilities)
{
rtx note = find_reg_note (jump, REG_BR_PROB, 0);
/* An inverted jump means that a probability taken becomes a
probability not taken. Subtract the branch probability from the
probability base to convert it back to a taken probability.
(We don't flip the probability on a branch that's never taken. */
if (note && XINT (XEXP (note, 0), 0) >= 0)
XINT (XEXP (note, 0), 0) = REG_BR_PROB_BASE - XINT (XEXP (note, 0), 0);
}
return 1;
}
if (! invert_exp (PATTERN (jump), jump))
/* This should just be putting it back the way it was. */