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| author | Richard Guenther <rguenther@suse.de> | 2008-01-25 15:33:09 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2008-01-25 15:33:09 +0000 |
| commit | dd3b33d7730a9d11c2cd809df030fc59ac5ca232 (patch) | |
| tree | 0c1732108c28dfd96d0a904da58046653148d363 | |
| parent | c256730cefa52bbb322ca3759a0411f9e245d366 (diff) | |
| download | gcc-dd3b33d7730a9d11c2cd809df030fc59ac5ca232.zip gcc-dd3b33d7730a9d11c2cd809df030fc59ac5ca232.tar.gz gcc-dd3b33d7730a9d11c2cd809df030fc59ac5ca232.tar.bz2 | |
re PR middle-end/32244 (bit-field: optimization BUG)
2008-01-25 Richard Guenther <rguenther@suse.de>
PR middle-end/32244
* expr.c (expand_expr_real_1): Reduce result of LSHIFT_EXPR
to its bitfield precision if required.
* gcc.c-torture/execute/pr32244-1.c: New testcase.
From-SVN: r131828
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/expr.c | 5 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.c-torture/execute/pr32244-1.c | 20 |
4 files changed, 35 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f16c87a..824f85a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2008-01-25 Richard Guenther <rguenther@suse.de> + + PR middle-end/32244 + * expr.c (expand_expr_real_1): Reduce result of LSHIFT_EXPR + to its bitfield precision if required. + 2008-01-25 Jakub Jelinek <jakub@redhat.com> PR middle-end/33880 @@ -8920,8 +8920,11 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode, target = 0; op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, EXPAND_NORMAL); - return expand_shift (code, mode, op0, TREE_OPERAND (exp, 1), target, + temp = expand_shift (code, mode, op0, TREE_OPERAND (exp, 1), target, unsignedp); + if (code == LSHIFT_EXPR) + temp = REDUCE_BIT_FIELD (temp); + return temp; /* Could determine the answer when only additive constants differ. Also, the addition of one can be handled by changing the condition. */ diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 407d42d..9fbd03a 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,5 +1,10 @@ 2008-01-25 Richard Guenther <rguenther@suse.de> + PR middle-end/32244 + * gcc.c-torture/execute/pr32244-1.c: New testcase. + +2008-01-25 Richard Guenther <rguenther@suse.de> + PR tree-optimization/34966 * gcc.c-torture/compile/pr34966.c: New testcase. diff --git a/gcc/testsuite/gcc.c-torture/execute/pr32244-1.c b/gcc/testsuite/gcc.c-torture/execute/pr32244-1.c new file mode 100644 index 0000000..afad256 --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/pr32244-1.c @@ -0,0 +1,20 @@ +struct foo +{ + unsigned long long b:40; +} x; + +extern void abort (void); + +void test1(unsigned long long res) +{ + /* The shift is carried out in 40 bit precision. */ + if (x.b<<32 != res) + abort (); +} + +int main() +{ + x.b = 0x0100; + test1(0); + return 0; +} |