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Chris Lattner 15ec361bd6 make the argument passing stuff in the FCA case smarter still, by 
avoiding making the FCA at all when the types exactly line up.  For
example, before we made:

%struct.DeclGroup = type { i64, i64 }

define i64 @_Z3foo9DeclGroup(i64, i64) nounwind {
entry:
  %D = alloca %struct.DeclGroup, align 8          ; <%struct.DeclGroup*> [#uses=3]
  %2 = insertvalue %struct.DeclGroup undef, i64 %0, 0 ; <%struct.DeclGroup> [#uses=1]
  %3 = insertvalue %struct.DeclGroup %2, i64 %1, 1 ; <%struct.DeclGroup> [#uses=1]
  store %struct.DeclGroup %3, %struct.DeclGroup* %D
  %tmp = getelementptr inbounds %struct.DeclGroup* %D, i32 0, i32 0 ; <i64*> [#uses=1]
  %tmp1 = load i64* %tmp                          ; <i64> [#uses=1]
  %tmp2 = getelementptr inbounds %struct.DeclGroup* %D, i32 0, i32 1 ; <i64*> [#uses=1]
  %tmp3 = load i64* %tmp2                         ; <i64> [#uses=1]
  %add = add nsw i64 %tmp1, %tmp3                 ; <i64> [#uses=1]
  ret i64 %add
}

... which has the pointless insertvalue, which fastisel hates, now we
make:

%struct.DeclGroup = type { i64, i64 }

define i64 @_Z3foo9DeclGroup(i64, i64) nounwind {
entry:
  %D = alloca %struct.DeclGroup, align 8          ; <%struct.DeclGroup*> [#uses=4]
  %2 = getelementptr %struct.DeclGroup* %D, i32 0, i32 0 ; <i64*> [#uses=1]
  store i64 %0, i64* %2
  %3 = getelementptr %struct.DeclGroup* %D, i32 0, i32 1 ; <i64*> [#uses=1]
  store i64 %1, i64* %3
  %tmp = getelementptr inbounds %struct.DeclGroup* %D, i32 0, i32 0 ; <i64*> [#uses=1]
  %tmp1 = load i64* %tmp                          ; <i64> [#uses=1]
  %tmp2 = getelementptr inbounds %struct.DeclGroup* %D, i32 0, i32 1 ; <i64*> [#uses=1]
  %tmp3 = load i64* %tmp2                         ; <i64> [#uses=1]
  %add = add nsw i64 %tmp1, %tmp3                 ; <i64> [#uses=1]
  ret i64 %add
}

This only kicks in when x86-64 abi lowering decides it likes us.

llvm-svn: 107104
 		2010-06-29 00:06:42 +00:00
..
INPUTS Add an input file that includes all standard C++ headers 2009-09-29 03:26:11 +00:00
bindings/python Rename 'CIndex' to 'libclang', since it has basically become our stable public 2010-04-30 21:51:10 +00:00
clang.xcodeproj Update Xcode project. 2010-06-08 20:02:04 +00:00
docs build: Get CLANG_VERSION from Version.inc instead of depending on VER file directly. 2010-06-25 17:33:49 +00:00
examples Frontend: Allow passing -cc1 level arguments to plugins. Patch by Troy Straszheim! 2010-06-16 16:59:23 +00:00
include A few prettifications. Also renamed TraverseInitializer to 2010-06-29 00:02:17 +00:00
lib make the argument passing stuff in the FCA case smarter still, by 2010-06-29 00:06:42 +00:00
test Change CGCall to handle the "coerce" case where the coerce-to type 2010-06-28 23:44:11 +00:00
tools Per Doug's suggestion, move check for invalid SourceLocation into 2010-06-28 23:54:17 +00:00
utils FuzzTest: Add support for reading list of replacements from a file. 2010-05-30 22:27:55 +00:00
www Update checker build. 2010-06-21 22:25:24 +00:00
CMakeLists.txt clang: Derive version name from LLVM unless specified explicitly. This means 2010-06-25 23:34:47 +00:00
INSTALL.txt
…
LICENSE.TXT 2010 is here. 2010-01-09 18:40:42 +00:00
Makefile Remove cruft that I didn't intend to commit. 2010-06-26 00:31:14 +00:00
ModuleInfo.txt
…
NOTES.txt Remove clang-cc tool, it has joined in unholy union with clang. 2009-12-12 00:56:47 +00:00
README.txt Fix typo (test commit) 2010-06-17 12:39:05 +00:00
TODO.txt switch -Werror/-Wfatal-errors error conditions to use diagnostics instead 2009-12-23 18:53:37 +00:00

README.txt 

//===----------------------------------------------------------------------===//
// C Language Family Front-end
//===----------------------------------------------------------------------===//

Welcome to Clang.  This is a compiler front-end for the C family of languages
(C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM
compiler infrastructure project.

Unlike many other compiler frontends, Clang is useful for a number of things
beyond just compiling code: we intend for Clang to be host to a number of
different source level tools.  One example of this is the Clang Static Analyzer.

If you're interested in more (including how to build Clang) it is best to read
the relevant web sites.  Here are some pointers:

Information on Clang:              http://clang.llvm.org/
Building and using Clang:          http://clang.llvm.org/get_started.html
Clang Static Analyzer:             http://clang-analyzer.llvm.org/
Information on the LLVM project:   http://llvm.org/

If you have questions or comments about Clang, a great place to discuss them is
on the Clang development mailing list:
  http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev

If you find a bug in Clang, please file it in the LLVM bug tracker:
  http://llvm.org/bugs/