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Add CodeGen support for functions that always return arguments via a new parameter attribute 'returned', which is taken advantage of in target-independent tail call opportunity detection and in ARM call lowering (when placed on an integral first parameter).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179925 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stephen Lin
2013-04-20 05:14:40 +00:00
parent 5c34e08b9f
commit 456ca048af
20 changed files with 371 additions and 43 deletions
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3
lib/AsmParser/LLParser.cpp
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@ -944,6 +944,7 @@ bool LLParser::ParseFnAttributeValuePairs(AttrBuilder &B,
case lltok::kw_nest:
case lltok::kw_noalias:
case lltok::kw_nocapture:
case lltok::kw_returned:
case lltok::kw_sret:
HaveError |=
Error(Lex.getLoc(),
@ -1156,6 +1157,7 @@ bool LLParser::ParseOptionalParamAttrs(AttrBuilder &B) {
case lltok::kw_nest: B.addAttribute(Attribute::Nest); break;
case lltok::kw_noalias: B.addAttribute(Attribute::NoAlias); break;
case lltok::kw_nocapture: B.addAttribute(Attribute::NoCapture); break;
case lltok::kw_returned: B.addAttribute(Attribute::Returned); break;
case lltok::kw_signext: B.addAttribute(Attribute::SExt); break;
case lltok::kw_sret: B.addAttribute(Attribute::StructRet); break;
case lltok::kw_zeroext: B.addAttribute(Attribute::ZExt); break;
@ -1199,6 +1201,7 @@ bool LLParser::ParseOptionalReturnAttrs(AttrBuilder &B) {
case lltok::kw_byval:
case lltok::kw_nest:
case lltok::kw_nocapture:
case lltok::kw_returned:
case lltok::kw_sret:
HaveError |= Error(Lex.getLoc(), "invalid use of parameter-only attribute");
break;