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re PR rtl-optimization/13159 (FAIL: gcc.c-torture/compile/930621-1.c) 

PR opt/13159
	* cfgloopanal.c (mark_irreducible_loops): Fix the strongly connected
	components detection.
	* loop-unswitch.c (unswitch_loop): Preserve simple preheaders.

	* gcc.c-torture/compile/20031227-1.c: New test.

From-SVN: r75174
This commit is contained in:
Zdenek Dvorak 2003-12-27 20:51:17 +01:00 committed by Zdenek Dvorak
parent 9bd85baa69
commit bf86d71e8a
5 changed files with 33 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2003-12-27 Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>
PR opt/13159
* cfgloopanal.c (mark_irreducible_loops): Fix the strongly connected
components detection.
* loop-unswitch.c (unswitch_loop): Preserve simple preheaders.
2003-12-27 Bernardo Innocenti <bernie@develer.com>
* config/m68k/uclinux.h (LIB_SPEC): Add elf2flt magic required for

2
gcc/cfgloopanal.c
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@ -1247,7 +1247,7 @@ mark_irreducible_loops (struct loops *loops)
: e->dest->index + 1;
if (closed[sidx])
{
if (!closed[mri[sidx]])
if (mri[sidx] != -1 && !closed[mri[sidx]])
{
if (mr[sidx] < mr[idx])
{

4
gcc/loop-unswitch.c
View File

@ -402,5 +402,9 @@ unswitch_loop (struct loops *loops, struct loop *loop, basic_block unswitch_on)
fix_loop_placement (loop);
fix_loop_placement (nloop);
/* Preserve the simple loop preheaders. */
loop_split_edge_with (loop_preheader_edge (loop), NULL_RTX, loops);
loop_split_edge_with (loop_preheader_edge (nloop), NULL_RTX, loops);
return nloop;
}

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2003-12-27 Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>
* gcc.c-torture/compile/20031227-1.c: New test.
2003-12-23 Mark Mitchell <mark@codesourcery.com>
* g++.dg/bprob/bprob.exp: Load target-supports.exp

17
gcc/testsuite/gcc.c-torture/compile/20031227-1.c Normal file
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@ -0,0 +1,17 @@
/* PR opt/13159 -- test unswitching a loop multiple times. */
void
foo (void)
{
long j, k, p, g;
while (p)
{
while (k < 0 && j < 0)
;
if (g)
;
else if (g)
;
}
}