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Add a new function attribute 'cold' to functions.

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Other than recognizing the attribute, the patch does little else.
It changes the branch probability analyzer so that edges into
blocks postdominated by a cold function are given low weight.

Added analysis and code generation tests.  Added documentation for the
new attribute.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182638 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Diego Novillo
2013-05-24 12:26:52 +00:00
parent 49a6a8d8f2
commit 77226a03dc
13 changed files with 200 additions and 1 deletions
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lib/AsmParser/LLParser.cpp
+2
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@@ -909,6 +909,7 @@ bool LLParser::ParseFnAttributeValuePairs(AttrBuilder &B,
continue;
}
case lltok::kw_alwaysinline: B.addAttribute(Attribute::AlwaysInline); break;
case lltok::kw_cold: B.addAttribute(Attribute::Cold); break;
case lltok::kw_inlinehint: B.addAttribute(Attribute::InlineHint); break;
case lltok::kw_minsize: B.addAttribute(Attribute::MinSize); break;
case lltok::kw_naked: B.addAttribute(Attribute::Naked); break;
@@ -1222,6 +1223,7 @@ bool LLParser::ParseOptionalReturnAttrs(AttrBuilder &B) {
case lltok::kw_alignstack:
case lltok::kw_alwaysinline:
case lltok::kw_cold:
case lltok::kw_inlinehint:
case lltok::kw_minsize:
case lltok::kw_naked: