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Group switch cases in switch lowering (PR tree-optimization/87205).

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2018-09-05  Martin Liska  <mliska@suse.cz>

	PR tree-optimization/87205
	* tree-switch-conversion.c (pass_lower_switch::execute):
	Group cases for switch statements.
2018-09-05  Martin Liska  <mliska@suse.cz>

	PR tree-optimization/87205
	* gcc.dg/tree-ssa/pr87205-2.c: New test.
	* gcc.dg/tree-ssa/pr87205.c: New test.

From-SVN: r264124
This commit is contained in:
Martin Liska 2018-09-05 13:28:49 +02:00 committed by Martin Liska
parent 85004cb2dc
commit e6c5d9f0f5
5 changed files with 58 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-09-05 Martin Liska <mliska@suse.cz>
PR tree-optimization/87205
* tree-switch-conversion.c (pass_lower_switch::execute):
Group cases for switch statements.
2018-09-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/87217

6
gcc/testsuite/ChangeLog
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@ -1,3 +1,9 @@
2018-09-05 Martin Liska <mliska@suse.cz>
PR tree-optimization/87205
* gcc.dg/tree-ssa/pr87205-2.c: New test.
* gcc.dg/tree-ssa/pr87205.c: New test.
2018-09-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/87217

18
gcc/testsuite/gcc.dg/tree-ssa/pr87205-2.c Normal file
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@ -0,0 +1,18 @@
/* { dg-options "-O2 -fdump-tree-optimized" } */
void f(int);
void h(unsigned i)
{
switch (i) {
default: __builtin_unreachable();
case 0: f(42); break;
case 1: f(42); break;
case 2: f(42); break;
case 3: f(42); break;
case 4: f(42); break;
case 5: f(42); break;
}
}
/* { dg-final { scan-tree-dump-not "if" "optimized" } } */
/* { dg-final { scan-tree-dump-not "switch" "optimized" } } */

21
gcc/testsuite/gcc.dg/tree-ssa/pr87205.c Normal file
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@ -0,0 +1,21 @@
/* { dg-options "-O2 -fdump-tree-optimized" } */
void f( int x );
void h( unsigned ix )
{
switch( ix )
{
case 0: f(42); break;
case 1: f(42); break;
case 2: f(42); break;
case 3: f(42); break;
case 4: f(42); break;
case 5: f(42); break;
default: __builtin_unreachable();
}
}
/* { dg-final { scan-tree-dump-not "if" "optimized" } } */
/* { dg-final { scan-tree-dump-not "switch" "optimized" } } */

9
gcc/tree-switch-conversion.c
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@ -2419,8 +2419,13 @@ pass_lower_switch<O0>::execute (function *fun)
FOR_EACH_BB_FN (bb, fun)
{
gimple *stmt = last_stmt (bb);
if (stmt && gimple_code (stmt) == GIMPLE_SWITCH)
switch_statements.safe_push (stmt);
gswitch *swtch;
if (stmt && (swtch = dyn_cast<gswitch *> (stmt)))
{
if (!O0)
group_case_labels_stmt (swtch);
switch_statements.safe_push (swtch);
}
}
for (unsigned i = 0; i < switch_statements.length (); i++)