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Author SHA1 Message Date
Vedant Kumar 82ee16beb8 [ubsan] Omit superflous overflow checks for promoted arithmetic (PR20193) 
C requires the operands of arithmetic expressions to be promoted if
their types are smaller than an int. Ubsan emits overflow checks when
this sort of type promotion occurs, even if there is no way to actually
get an overflow with the promoted type.

This patch teaches clang how to omit the superflous overflow checks
(addressing PR20193).

Testing: check-clang and check-ubsan.

Differential Revision: https://reviews.llvm.org/D29369

llvm-svn: 296213
 2017-02-25 00:43:36 +00:00
David Blaikie a953f2825b Update Clang tests to handle explicitly typed load changes in LLVM. 
llvm-svn: 230795
 2015-02-27 21:19:58 +00:00
Stephen Lin 4362261b00 CHECK-LABEL-ify some code gen tests to improve diagnostic experience when tests fail. 
llvm-svn: 188447
 2013-08-15 06:47:53 +00:00
Will Dietz 1897cb3b9c Add -fsanitize=integer for reporting suspicious integer behaviors. 
Introduces new sanitizer "unsigned-integer-overflow".

llvm-svn: 168701
 2012-11-27 15:01:55 +00:00