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re PR tree-optimization/36881 (Creating runtime relocations for code which does not need it)

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PR tree-optimization/36881
	* tree-switch-conversion.c (check_final_bb): For flag_pic, check
	that each value doesn't need runtime relocations, for !flag_pic
	check that each value is just a valid initializer constant.

	* gcc.dg/tree-ssa/pr36881.c: New test.

From-SVN: r141129
This commit is contained in:
Jakub Jelinek 2008-10-15 08:43:19 +02:00 committed by Jakub Jelinek
parent e3bc2fa7e6
commit f6e6e9904c
4 changed files with 57 additions and 5 deletions

7
gcc/ChangeLog

@ -1,3 +1,10 @@
2008-10-15 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/36881
* tree-switch-conversion.c (check_final_bb): For flag_pic, check
that each value doesn't need runtime relocations, for !flag_pic
check that each value is just a valid initializer constant.
2008-10-14 Richard Sandiford <rdsandiford@googlemail.com>
* config/mips/mips.h (reg_class): Remove HI_AND_GR_REGS,

5
gcc/testsuite/ChangeLog

@ -1,3 +1,8 @@
2008-10-15 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/36881
* gcc.dg/tree-ssa/pr36881.c: New test.
2008-10-14 Jakub Jelinek <jakub@redhat.com>
PR c++/37819

23
gcc/testsuite/gcc.dg/tree-ssa/pr36881.c Normal file

@ -0,0 +1,23 @@
/* PR tree-optimization/36881 */
/* { dg-do compile { target fpic } } */
/* { dg-options "-O2 -fpic -fdump-tree-switchconv-all" } */
const char *foo (int i)
{
const char *p;
switch (i)
{
case 0:
case 6: p = ""; break;
case 1:
case 7: p = "abc"; break;
case 2:
case 8: p = "def"; break;
default: p = "ghi"; break;
}
return p;
}
/* { dg-final { scan-assembler-not "CSWTCH" } } */
/* { dg-final { scan-tree-dump "need runtime relocations" "switchconv" } } */
/* { dg-final { cleanup-tree-dump "switchconv" } } */

27
gcc/tree-switch-conversion.c

@ -296,12 +296,29 @@ check_final_bb (void)
{
basic_block bb = gimple_phi_arg_edge (phi, i)->src;
if ((bb == info.switch_bb
|| (single_pred_p (bb) && single_pred (bb) == info.switch_bb))
&& !is_gimple_ip_invariant (gimple_phi_arg_def (phi, i)))
if (bb == info.switch_bb
|| (single_pred_p (bb) && single_pred (bb) == info.switch_bb))
{
info.reason = " Non-invariant value from a case\n";
return false; /* Non-invariant argument. */
tree reloc, val;
val = gimple_phi_arg_def (phi, i);
if (!is_gimple_ip_invariant (val))
{
info.reason = " Non-invariant value from a case\n";
return false; /* Non-invariant argument. */
}
reloc = initializer_constant_valid_p (val, TREE_TYPE (val));
if ((flag_pic && reloc != null_pointer_node)
|| (!flag_pic && reloc == NULL_TREE))
{
if (reloc)
info.reason
= " Value from a case would need runtime relocations\n";
else
info.reason
= " Value from a case is not a valid initializer\n";
return false;
}
}
}
}