Support IRgen of sqrt -> llvm.sqrt, pow -> llvm.pow.
- Define pow[lf]?, sqrt[lf]? as builtins.
- Add -fmath-errno option which binds to LangOptions.MathErrno
- Add new builtin flag Builtin::Context::isConstWithoutErrno for
functions which can be marked as const if errno isn't respected for
math functions. Sema automatically marks these functions as const
when they are defined, if MathErrno=0.
- IRgen uses const attribute on sqrt and pow library functions to
decide if it can use the llvm intrinsic.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64689 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 2692cd9..4f8b245 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -2956,6 +2956,15 @@
if (!FD->getAttr<FormatAttr>())
FD->addAttr(new FormatAttr("printf", FormatIdx + 1, FormatIdx + 2));
}
+
+ // Mark const if we don't care about errno and that is the only
+ // thing preventing the function from being const. This allows
+ // IRgen to use LLVM intrinsics for such functions.
+ if (!getLangOptions().MathErrno &&
+ Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
+ if (!FD->getAttr<ConstAttr>())
+ FD->addAttr(new ConstAttr());
+ }
}
IdentifierInfo *Name = FD->getIdentifier();