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| author | ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4> | 2016-07-12 15:00:28 +0000 |
|---|---|---|
| committer | ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4> | 2016-07-12 15:00:28 +0000 |
| commit | cd32d7475b83c730185d0a266838a60999515632 (patch) | |
| tree | 277c9334e6c15f3d94d37021a3b0b7007827c8eb /gcc/expr.c | |
| parent | 1138783ec9f31bdd09548e72296f804d6ad6cc5c (diff) | |
[expr.c] PR middle-end/71700: zero-extend sub-word value when widening constructor element
PR middle-end/71700
* expr.c (store_constructor): Mask sign-extended bits when widening
sub-word constructor element at the start of a word.
* gcc.c-torture/execute/pr71700.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@238248 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/expr.c b/gcc/expr.c index fbc91ad667f..4073a989d96 100644 --- a/gcc/expr.c +++ b/gcc/expr.c @@ -6281,6 +6281,13 @@ store_constructor (tree exp, rtx target, int cleared, HOST_WIDE_INT size, type = lang_hooks.types.type_for_mode (word_mode, TYPE_UNSIGNED (type)); value = fold_convert (type, value); + /* Make sure the bits beyond the original bitsize are zero + so that we can correctly avoid extra zeroing stores in + later constructor elements. */ + tree bitsize_mask + = wide_int_to_tree (type, wi::mask (bitsize, false, + BITS_PER_WORD)); + value = fold_build2 (BIT_AND_EXPR, type, value, bitsize_mask); } if (BYTES_BIG_ENDIAN) |