From b24bee039721e7304575c4c0b93bb1601dd63463 Mon Sep 17 00:00:00 2001 From: sayle Date: Sat, 31 May 2003 13:23:32 +0000 Subject: * 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 --- gcc/java/ChangeLog | 5 +++++ gcc/java/lang.c | 3 +++ 2 files changed, 8 insertions(+) (limited to 'gcc/java') 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 + + * lang.c (java_init_options): Prescribe wrap-around two's + complement arithmetic overflow by setting flag_wrapv. + 2003-05-29 Roger Sayle * 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 -- cgit v1.2.3