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Author SHA1 Message Date
Michael Gottesman 1534399059 [multiprecision-builtins] Added missing builtin __builtin_{add,sub}cb for {add,sub} with carry for bytes. 
I have had several people ask me about why this builtin was not available in
clang (since it seems like a logical conclusion). This patch implements said
builtins.

Relevant tests are included as well. I also updated the Clang language extension reference.

rdar://14192664.

llvm-svn: 184227
 2013-06-18 20:40:40 +00:00
Michael Gottesman a2b5c4ba6a Multiprecision subtraction builtins. 
We lower these into 2x chained usub.with.overflow intrinsics.

llvm-svn: 172476
 2013-01-14 21:44:30 +00:00
NAKAMURA Takumi 4b7d1ce9c1 clang/test/CodeGen/builtins-multiprecision.c: Enhance for each test to run on theree targets, i686, amd64, win64. 
llvm-svn: 172344
 2013-01-13 03:55:21 +00:00
Michael Gottesman 987226696e Fixed spelling of test name: builtins-multipercision.c => builtins-multiprecision.c. 
llvm-svn: 172343
 2013-01-13 03:44:31 +00:00