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re PR rtl-optimization/42164 (internal compiler error: in simplify_subreg, at simplify-rtx.c:5138) 

2009-12-04  David Daney  <ddaney@caviumnetworks.com>

	PR rtl-optimization/42164
	* combine.c (combine_simplify_rtx): Handle truncation of integer
	constants.

2009-12-04  David Daney  <ddaney@caviumnetworks.com>

	PR rtl-optimization/42164
	* gcc.c-torture/compile/pr42164.c: New test.

From-SVN: r154987
This commit is contained in:
David Daney 2009-12-04 17:46:23 +00:00 committed by David Daney
parent c21237d527
commit d0e4968c33
4 changed files with 40 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2009-12-04 David Daney <ddaney@caviumnetworks.com>
PR rtl-optimization/42164
* combine.c (combine_simplify_rtx): Handle truncation of integer
constants.
2009-12-04 Richard Guenther <rguenther@suse.de>
* lto-streamer-out.c (pack_ts_decl_common_value_fields):

4
gcc/combine.c
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@ -5156,6 +5156,10 @@ combine_simplify_rtx (rtx x, enum machine_mode op0_mode, int in_dest)
force_to_mode (XEXP (x, 0), GET_MODE (XEXP (x, 0)),
GET_MODE_MASK (mode), 0));
/* We can truncate a constant value and return it. */
if (CONST_INT_P (XEXP (x, 0)))
return gen_int_mode (INTVAL (XEXP (x, 0)), mode);
/* Similarly to what we do in simplify-rtx.c, a truncate of a register
whose value is a comparison can be replaced with a subreg if
STORE_FLAG_VALUE permits. */

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2009-12-04 David Daney <ddaney@caviumnetworks.com>
PR rtl-optimization/42164
* gcc.c-torture/compile/pr42164.c: New test.
2009-12-04 Eric Botcazou <ebotcazou@adacore.com>
* gnat.dg/specs/size_attribute1.ads: New test.

25
gcc/testsuite/gcc.c-torture/compile/pr42164.c Normal file
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@ -0,0 +1,25 @@
typedef struct
{
unsigned long long pte;
} pte_t;
pte_t mk_swap_pte (unsigned long offset)
{
pte_t pte;
pte.pte = (offset << 40);
return pte;
}
int pte_file (pte_t pte)
{
return pte.pte & (1 << 4);
}
typedef struct
{
unsigned long val;
} swp_entry_t;
pte_t swp_entry_to_pte (swp_entry_t entry)
{
swp_entry_t arch_entry;
arch_entry = (swp_entry_t){mk_swap_pte (swp_offset (entry)).pte};
__BUG_ON ((unsigned long) pte_file ((pte_t) {arch_entry.val}));
return (pte_t) {arch_entry.val};
}