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re PR middle-end/23522 (fold_widened_comparison bug)

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PR middle-end/23522
	* fold-const.c (fold_widened_comparison): Do not allow range based
	constant folding when right operand cannot be unwidened.

Co-Authored-By: Ian Lance Taylor <ian@airs.com>

From-SVN: r105536
This commit is contained in:
Alexey Starovoytov 2005-10-18 03:16:21 +00:00 committed by Ian Lance Taylor
parent 74395677b7
commit 1630e763dc
2 changed files with 10 additions and 3 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2005-10-17 Alexey Starovoytov <alexey.starovoytov@sun.com>
Ian Lance Taylor <ian@airs.com>
PR middle-end/23522
* fold-const.c (fold_widened_comparison): Do not allow range based
constant folding when right operand cannot be unwidened.
2005-10-17 Richard Henderson <rth@redhat.com>
* builtins.c (expand_builtin_synchronize): Build a new-style asm

6
gcc/fold-const.c
View File

@ -6250,8 +6250,6 @@ fold_widened_comparison (enum tree_code code, tree type, tree arg0, tree arg1)
return NULL_TREE;
arg1_unw = get_unwidened (arg1, shorter_type);
if (!arg1_unw)
return NULL_TREE;
/* If possible, express the comparison in the shorter mode. */
if ((code == EQ_EXPR || code == NE_EXPR
@ -6264,7 +6262,9 @@ fold_widened_comparison (enum tree_code code, tree type, tree arg0, tree arg1)
return fold_build2 (code, type, arg0_unw,
fold_convert (shorter_type, arg1_unw));
if (TREE_CODE (arg1_unw) != INTEGER_CST)
if (TREE_CODE (arg1_unw) != INTEGER_CST
|| TREE_CODE (shorter_type) != INTEGER_TYPE
|| !int_fits_type_p (arg1_unw, shorter_type))
return NULL_TREE;
/* If we are comparing with the integer that does not fit into the range