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re PR tree-optimization/55052 (vect-widening tests are failing and giving wrong results)

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gcc/
	PR rtl-optimization/55052
	* simplify-rtx.c (simplify_subreg): Restore SCALAR_INT_MODE_P check.

From-SVN: r193909
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Richard Sandiford 2012-11-28 21:45:03 +00:00 • committed by Richard Sandiford
parent 74c49505d0
commit 373b9e782b
2 changed files with 6 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2012-11-28 Richard Sandiford <rdsandiford@googlemail.com>
PR rtl-optimization/55052
* simplify-rtx.c (simplify_subreg): Restore SCALAR_INT_MODE_P check.
2012-11-28 David Edelsohn <dje.gcc@gmail.com>
* target.def (use_blocks_for_decl_p): New hook.

2
gcc/simplify-rtx.c
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@ -5875,7 +5875,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
/* A SUBREG resulting from a zero extension may fold to zero if
it extracts higher bits that the ZERO_EXTEND's source bits. */
if (GET_CODE (op) == ZERO_EXTEND)
if (GET_CODE (op) == ZERO_EXTEND && SCALAR_INT_MODE_P (innermode))
{
unsigned int bitpos = subreg_lsb_1 (outermode, innermode, byte);
if (bitpos >= GET_MODE_PRECISION (GET_MODE (XEXP (op, 0))))