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re PR middle-end/58742 (pointer arithmetic simplification) 

2013-10-21  Richard Biener  <rguenther@suse.de>

	PR middle-end/58742
	* fold-const.c (fold_binary_loc): Fold ((T) (X /[ex] C)) * C
	to (T) X for sign-changing conversions (or no conversion).

	* c-c++-common/fold-divmul-1.c: New testcase.

From-SVN: r203890
This commit is contained in:
Richard Biener 2013-10-21 11:34:04 +00:00 committed by Richard Biener
parent 54f9aba031
commit d480e6a572
4 changed files with 29 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2013-10-21 Richard Biener <rguenther@suse.de>
PR middle-end/58742
* fold-const.c (fold_binary_loc): Fold ((T) (X /[ex] C)) * C
to (T) X for sign-changing conversions (or no conversion).
2013-10-20 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (kxnor<mode>): Add FLAGS_REG clobber.

7
gcc/fold-const.c
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@ -11002,6 +11002,13 @@ fold_binary_loc (location_t loc,
fold_build2_loc (loc, MULT_EXPR, type,
build_int_cst (type, 2) , arg1));
/* ((T) (X /[ex] C)) * C cancels out if the conversion is
sign-changing only. */
if (TREE_CODE (arg1) == INTEGER_CST
&& TREE_CODE (arg0) == EXACT_DIV_EXPR
&& operand_equal_p (arg1, TREE_OPERAND (arg0, 1), 0))
return fold_convert_loc (loc, type, TREE_OPERAND (arg0, 0));
strict_overflow_p = false;
if (TREE_CODE (arg1) == INTEGER_CST
&& 0 != (tem = extract_muldiv (op0, arg1, code, NULL_TREE,

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2013-10-21 Richard Biener <rguenther@suse.de>
PR middle-end/58742
* c-c++-common/fold-divmul-1.c: New testcase.
2013-10-21 Michael Zolotukhin <michael.v.zolotukhin@gmail.com>
* gcc.target/i386/memset-vector_loop-1.c: New test.

11
gcc/testsuite/c-c++-common/fold-divmul-1.c Normal file
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@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-options "-fdump-tree-original" } */
int *
fx (int *b, int *e)
{
return b + (e - b);
}
/* { dg-final { scan-tree-dump-not "/\\\[ex\\\]" "original" } } */
/* { dg-final { cleanup-tree-dump "original" } } */