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| author | Marc Glisse <marc.glisse@inria.fr> | 2013-08-24 00:16:08 +0200 |
|---|---|---|
| committer | Marc Glisse <glisse@gcc.gnu.org> | 2013-08-23 22:16:08 +0000 |
| commit | 0cadbfaa89805ce4d1b93bed04c10d7c7bf1f6e2 (patch) | |
| tree | fd1a5007e3c6c876ebf4f1982aa74584d82afc0d /gcc/combine.c | |
| parent | 4500f676e138a5ea3337ebd47745d8b49ba775b5 (diff) | |
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re PR other/57324 (Undefined behavior issues found with clang's -fsanitize=undefined)
2013-08-24 Marc Glisse <marc.glisse@inria.fr>
PR other/57324
* hwint.h (HOST_WIDE_INT_UC, HOST_WIDE_INT_1U, HOST_WIDE_INT_M1,
HOST_WIDE_INT_M1U): New macros.
* fold-const.c (sign_bit_p, build_range_check, fold_unary_loc,
fold_binary_loc, fold_ternary_loc): Use the new macros. Use an
unsigned -1 for lshift.
* cse.c (cse_insn): Likewise.
* double-int.c (rshift_double, lshift_double): Likewise.
* builtins.c (fold_builtin_bitop): Likewise.
* combine.c (force_to_mode): Likewise.
* tree.c (integer_pow2p, tree_log2, tree_floor_log2): Likewise.
* simplify-rtx.c (simplify_const_unary_operation,
simplify_const_binary_operation): Likewise.
* tree-stdarg.c (va_list_counter_bump, va_list_ptr_read,
check_va_list_escapes): Likewise.
* rtlanal.c (nonzero_bits1): Likewise.
* expmed.c (expand_smod_pow2): Likewise.
* tree-ssa-structalias.c (UNKNOWN_OFFSET): Use HOST_WIDE_INT_MIN.
From-SVN: r201953
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 29dfd15..fc566c5 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -8129,8 +8129,8 @@ force_to_mode (rtx x, enum machine_mode mode, unsigned HOST_WIDE_INT mask, /* If MODE is narrower than HOST_WIDE_INT and CVAL is a negative number, sign extend it. */ if (width > 0 && width < HOST_BITS_PER_WIDE_INT - && (cval & ((unsigned HOST_WIDE_INT) 1 << (width - 1))) != 0) - cval |= (unsigned HOST_WIDE_INT) -1 << width; + && (cval & (HOST_WIDE_INT_1U << (width - 1))) != 0) + cval |= HOST_WIDE_INT_M1U << width; y = simplify_gen_binary (AND, GET_MODE (x), XEXP (x, 0), GEN_INT (cval)); @@ -8158,8 +8158,8 @@ force_to_mode (rtx x, enum machine_mode mode, unsigned HOST_WIDE_INT mask, number, sign extend it. */ if (width < HOST_BITS_PER_WIDE_INT - && (smask & ((unsigned HOST_WIDE_INT) 1 << (width - 1))) != 0) - smask |= (unsigned HOST_WIDE_INT) (-1) << width; + && (smask & (HOST_WIDE_INT_1U << (width - 1))) != 0) + smask |= HOST_WIDE_INT_M1U << width; if (CONST_INT_P (XEXP (x, 1)) && exact_log2 (- smask) >= 0 |