846ded2e53
PR9350: increment/decrement of char (and anything else narrower than int)
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can't overflow due to promotion rules; emit a wrapping add for those cases.
llvm-svn: 126816
2011-03-02 01:49:12 +00:00
2e72da947c
-fwrapv should turn off the inbounds markers from geps used for pointer
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arithmetic. This is part of PR9256, it would be great if someone else
wired up -fno-strict-overflow in the driver to -fwrapv.
llvm-svn: 126718
2011-03-01 00:03:48 +00:00
dd84ef1e62
Add a -ftrapv-handler= option which allows a handler to invoke instead of simply aborting when a signed operation overflows. This mirrors the (GCC-incompatible) behaviour from clang 1.0 and 1.1 when -ftrapv was specified, but allows the handler to be defined for each compilation unit.
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llvm-svn: 114192
2010-09-17 18:29:54 +00:00
431bef4409
fix inc/dec to honor -fwrapv and -ftrapv, implementing PR7426.
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llvm-svn: 106962
2010-06-26 22:18:28 +00:00
0bf27620f0
Fix unary minus to trap on overflow with -ftrapv, refactoring binop
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code so we can use it from VisitUnaryMinus.
llvm-svn: 106957
2010-06-26 21:48:21 +00:00
51924e517b
Implement support for -fwrapv, rdar://7221421
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As part of this, pull together trapv handling into the same enum.
This also add support for NSW multiplies.
This also makes PCH disagreement on overflow behavior silent, since it
really doesn't matter except for warnings and codegen (no macros get
defined etc).
llvm-svn: 106956
2010-06-26 21:25:03 +00:00
Eli Friedman