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| author | sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-05-31 13:23:32 +0000 |
|---|---|---|
| committer | sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-05-31 13:23:32 +0000 |
| commit | b24bee039721e7304575c4c0b93bb1601dd63463 (patch) | |
| tree | ae8dcbb261aaadbfa874d60f1fccd8dd93248b50 /gcc/java | |
| parent | 7bfd46d1db1b9ad908c67e722ca2e3221481c938 (diff) | |
| download | ppe42-gcc-b24bee039721e7304575c4c0b93bb1601dd63463.tar.gz ppe42-gcc-b24bee039721e7304575c4c0b93bb1601dd63463.zip | |
* flags.h (flag_wrapv): New flag controlling overflow semantics.
* toplev.c (flag_wrapv): Declare the variable with default false.
(lang_independent_options): New option "-fwrapv" to set the above.
* fold-const.c (extract_muldiv_1): Disable optimization of (2*x)/2
as x, when signed arithmetic overflow wraps around.
(fold): Optimize "-A - B" as "-B - A" if overflow wraps around.
* loop.c (basic_induction_var): Ignore BIVs that rely on undefined
overflow when flag_wrapv is true.
* java/lang.c (java_init_options): Prescribe wrap-around two's
complement arithmetic overflow by setting flag_wrapv.
* doc/invoke.texi: Document new -fwrapv command line option.
* doc/c-tree.texi: Mention that the overflow semantics of
NEGATE_EXPR, PLUS_EXPR, MINUS_EXPR and MULT_EXPR is dependent
upon both flag_wrapv and flag_trapv.
* gcc.dg/fwrapv-1.c: New test case.
* gcc.dg/fwrapv-2.c: New test case.
* libjava.lang/Overflow.java: New test.
* libjava.lang/Overflow.out: New file.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@67270 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/java')
| -rw-r--r-- | gcc/java/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/java/lang.c | 3 |
2 files changed, 8 insertions, 0 deletions
diff --git a/gcc/java/ChangeLog b/gcc/java/ChangeLog index 8dc9ecaf2e5..b41f316c5e2 100644 --- a/gcc/java/ChangeLog +++ b/gcc/java/ChangeLog @@ -1,3 +1,8 @@ +2003-05-31 Roger Sayle <roger@eyesopen.com> + + * lang.c (java_init_options): Prescribe wrap-around two's + complement arithmetic overflow by setting flag_wrapv. + 2003-05-29 Roger Sayle <roger@eyesopen.com> * builtins.c (cos_builtin, sin_builtin, sqrt_builtin): Delete. diff --git a/gcc/java/lang.c b/gcc/java/lang.c index 031ddcc38b8..918be0a5d7d 100644 --- a/gcc/java/lang.c +++ b/gcc/java/lang.c @@ -740,6 +740,9 @@ java_init_options (void) /* In Java floating point operations never trap. */ flag_trapping_math = 0; + + /* In Java arithmetic overflow always wraps around. */ + flag_wrapv = 1; } static bool |
