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re PR middle-end/61903 (signed integer overflow in expmed.c store_fixed_bit_filed_1)

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PR middle-end/61903
	* expmed.c (store_fixed_bit_field_1): Shift UHWI 1 instead of HWI 1.
	Change the type of V to unsigned HOST_WIDE_INT.

From-SVN: r214781
This commit is contained in:
Marek Polacek 2014-09-01 09:18:43 +00:00 committed by Marek Polacek
parent e3ef4162ba
commit e507a43338
2 changed files with 11 additions and 4 deletions

6
gcc/ChangeLog

@ -1,3 +1,9 @@
2014-09-01 Marek Polacek <polacek@redhat.com>
PR middle-end/61903
* expmed.c (store_fixed_bit_field_1): Shift UHWI 1 instead of HWI 1.
Change the type of V to unsigned HOST_WIDE_INT.
2014-09-01 Thomas Preud'homme <thomas.preudhomme@arm.com>
* tree-ssa-math-opts.c (struct symbolic_number): Clarify comment about

9
gcc/expmed.c

@ -1057,16 +1057,17 @@ store_fixed_bit_field_1 (rtx op0, unsigned HOST_WIDE_INT bitsize,
if (CONST_INT_P (value))
{
HOST_WIDE_INT v = INTVAL (value);
unsigned HOST_WIDE_INT v = UINTVAL (value);
if (bitsize < HOST_BITS_PER_WIDE_INT)
v &= ((HOST_WIDE_INT) 1 << bitsize) - 1;
v &= ((unsigned HOST_WIDE_INT) 1 << bitsize) - 1;
if (v == 0)
all_zero = 1;
else if ((bitsize < HOST_BITS_PER_WIDE_INT
&& v == ((HOST_WIDE_INT) 1 << bitsize) - 1)
|| (bitsize == HOST_BITS_PER_WIDE_INT && v == -1))
&& v == ((unsigned HOST_WIDE_INT) 1 << bitsize) - 1)
|| (bitsize == HOST_BITS_PER_WIDE_INT
&& v == (unsigned HOST_WIDE_INT) -1))
all_one = 1;
value = lshift_value (mode, v, bitnum);