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* final.c (final_scan_insn): Disable tracking CC across branches.

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From-SVN: r22533
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John Carr 1998-09-21 17:21:44 +00:00 committed by John Carr
parent 43566944af
commit 7ad7f828fc
2 changed files with 9 additions and 2 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Mon Sep 21 20:19:41 1998 John Carr <jfc@mit.edu>
* final.c (final_scan_insn): Disable tracking CC across branches.
Mon Sep 21 17:15:26 EDT 1998 Andrew MacLeod <amacleod@cygnus.com>
* expr.h (eh_rtime_match_libfunc): New extern declaration.

7
gcc/final.c
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@ -1983,7 +1983,7 @@ final (first, file, optimize, prescan)
#ifdef HAVE_cc0
/* If CC tracking across branches is enabled, record the insn which
jumps to each branch only reached from one place. */
if (GET_CODE (insn) == JUMP_INSN)
if (optimize && GET_CODE (insn) == JUMP_INSN)
{
rtx lab = JUMP_LABEL (insn);
if (lab && LABEL_NUSES (lab) == 1)
@ -2299,7 +2299,10 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
CC_STATUS_INIT;
/* If this label is reached from only one place, set the condition
codes from the instruction just before the branch. */
if (LABEL_NUSES (insn) == 1)
/* Disabled because some insns set cc_status in the C output code
and NOTICE_UPDATE_CC alone can set incorrect status. */
if (0 /* optimize && LABEL_NUSES (insn) == 1*/)
{
rtx jump = LABEL_REFS (insn);
rtx barrier = prev_nonnote_insn (insn);