[GSoC] add nsw generation in LLVM IR for signed adds #6046
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mppf
reviewed
Apr 27, 2017
compiler/codegen/expr.cpp
Outdated
| @@ -1498,7 +1498,7 @@ GenRet codegenAdd(GenRet a, GenRet b) | |||
| if(values.a->getType()->isFPOrFPVectorTy()) { | |||
| ret.val = info->builder->CreateFAdd(values.a, values.b); | |||
| } else { | |||
| ret.val = info->builder->CreateAdd(values.a, values.b); | |||
| ret.val = info->builder->CreateAdd(values.a, values.b, "", false, values.isSigned); | |||
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Could you add a comment near the additional arguments to say that the intent is to use an 'nsw' add for signed integers?
coodie
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This PR adds generation of nsw instruction to Chapel's LLVM IR. This change is supposed to improve loop vectorization as discovered in #5788.