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| author | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-10-22 08:50:00 +0000 |
|---|---|---|
| committer | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-10-22 08:50:00 +0000 |
| commit | 789c209fda231b2b8eb317050530aa975e3d26da (patch) | |
| tree | 814f4b559dbb98d632f1ed844b3031df1728d560 /gcc/ada/gcc-interface/utils.c | |
| parent | eca7bb9bcb5815c4c3a12035122744e97b7384ab (diff) | |
| download | ppe42-gcc-789c209fda231b2b8eb317050530aa975e3d26da.tar.gz ppe42-gcc-789c209fda231b2b8eb317050530aa975e3d26da.zip | |
* gcc-interface/utils.c (rest_of_record_type_compilation): Simplify and
robustify pattern machine code for masking operations.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@192672 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/ada/gcc-interface/utils.c')
| -rw-r--r-- | gcc/ada/gcc-interface/utils.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/gcc/ada/gcc-interface/utils.c b/gcc/ada/gcc-interface/utils.c index d9121c1931e..624e724f23c 100644 --- a/gcc/ada/gcc-interface/utils.c +++ b/gcc/ada/gcc-interface/utils.c @@ -1731,19 +1731,23 @@ rest_of_record_type_compilation (tree record_type) tree offset = TREE_OPERAND (curpos, 0); align = tree_low_cst (TREE_OPERAND (curpos, 1), 1); - /* An offset which is a bitwise AND with a negative power of 2 - means an alignment corresponding to this power of 2. Note - that, as sizetype is sign-extended but nonetheless unsigned, - we don't directly use tree_int_cst_sgn. */ + /* An offset which is a bitwise AND with a mask increases the + alignment according to the number of trailing zeros. */ offset = remove_conversions (offset, true); if (TREE_CODE (offset) == BIT_AND_EXPR - && host_integerp (TREE_OPERAND (offset, 1), 0) - && TREE_INT_CST_HIGH (TREE_OPERAND (offset, 1)) < 0) + && TREE_CODE (TREE_OPERAND (offset, 1)) == INTEGER_CST) { - unsigned int pow - = - tree_low_cst (TREE_OPERAND (offset, 1), 0); - if (exact_log2 (pow) > 0) - align *= pow; + unsigned HOST_WIDE_INT mask + = TREE_INT_CST_LOW (TREE_OPERAND (offset, 1)); + unsigned int i; + + for (i = 0; i < HOST_BITS_PER_WIDE_INT; i++) + { + if (mask & 1) + break; + mask >>= 1; + align *= 2; + } } pos = compute_related_constant (curpos, |
