Early clobbers defining a virtual register were first alocated to a physreg and
then processed as a physreg EC, spilling the virtreg.

This fixes PR7382.

llvm-svn: 105998

Given a copy instruction, CoalescerPair can determine which registers to
coalesce in order to eliminate the copy. It deals with all the subreg fun to
determine a tuple (DstReg, SrcReg, SubIdx) such that:

- SrcReg is a virtual register that will disappear after coalescing.
- DstReg is a virtual or physical register whose live range will be extended.
- SubIdx is 0 when DstReg is a physical register.
- SrcReg can be joined with DstReg:SubIdx.

CoalescerPair::isCoalescable() determines if another copy instruction is
compatible with the same tuple. This fixes some NEON miscompilations where
shuffles are getting coalesced as if they were copies.

The CoalescerPair class will replace a lot of the spaghetti logic in JoinCopy
later.

llvm-svn: 105997

problem; patch by Ed Schouten.

llvm-svn: 105996

llvm-svn: 105995

llvm-svn: 105994

llvm-svn: 105993

Stmt* such as those which occur in ?: . Fixes PR7378.

Also, generally whip the code into shape fixing several coding style violations.

llvm-svn: 105992

replacing the overly conservative checks that I had introduced recently to
deal with correctness issues.  This makes a pretty noticable difference
in our testcases where reg_sequences are used.  I've updated one test to
check that we no longer emit the unnecessary subreg moves.

llvm-svn: 105991

llvm-svn: 105990

llvm-svn: 105988

llvm-svn: 105987

containing the target address, an input, into an output.  I don't
think this actually broke anything on x86 (it does on ARM), but
it's wrong.

llvm-svn: 105986

won't define it unless specifically requested via the use of __need_wint_t.

llvm-svn: 105985

llvm-svn: 105984

the combined load/store instruction. rdar://7797940

llvm-svn: 105982

source code location instead of on the note.  Previously we generated:

<inline asm>:1:2: error: unrecognized instruction
        barf
        ^
t.c:4:8: note: generated from here
  asm ("barf");
       ^

Now we generate:

t.c:4:8: error: unrecognized instruction
  asm ("barf");
       ^
<inline asm>:1:2: note: instantated into assembly here
        barf
        ^

llvm-svn: 105978

handle visibility properly. Fixes <rdar://problem/8091955>. 

llvm-svn: 105977

mangling for types, where the <source-name> is ASxxx (xxx is the
address-space number).

llvm-svn: 105975

llvm-svn: 105971

llvm-svn: 105970

immediate" operands.  These functions have so far only been used for VMOV
but they also apply to other NEON instructions with modified immediate
operands.  No functional changes.

llvm-svn: 105969

non-dependent type or template name, respectively, in C++98/03. Fixes
PR7111 and <rdar://problem/8002682>.

llvm-svn: 105968

llvm-svn: 105966

Make sure to skip the dbg_value instructions when moving dups out of the
diamond. rdar://7797940

llvm-svn: 105965

collect2 option that is passed by some projects (notably WebKit).

llvm-svn: 105964

Also, fix a memory leak.

llvm-svn: 105963

llvm-svn: 105962

initializations into their own warning group, initializer-overrides,
which is part of -Wextra. Patch by william@25thandClement.com, fixes
PR6934!

llvm-svn: 105961

- Rename ExactHazardRecognizer to PostRAHazardRecognizer and move its header to include to allow targets to extend it.

llvm-svn: 105959

llvm-svn: 105958

llvm-svn: 105957

llvm-svn: 105956

llvm-svn: 105955

symbols as declarations in the X86 backend.  This would manifest
on darwin x86-32 as errors like this with -fvisibility=hidden:

symbol '__ZNSbIcED1Ev' can not be undefined in a subtraction expression

This fixes PR7353.

llvm-svn: 105954

llvm-svn: 105953

llvm-svn: 105952

from Peter Collingbourne!

llvm-svn: 105951

fixes PR7356.

llvm-svn: 105950

llvm-svn: 105949

Decl.cpp:716:28: warning: initialization of pointer of type 'clang::VarDecl *' from literal 'false' [-Wbool-conversions]
  VarDecl *LastTentative = false;
                           ^
RewriteRope.cpp:535:12: warning: initialization of pointer of type '<anonymous>::RopePieceBTreeNode *' from literal 'false'
      [-Wbool-conversions]
    return false;
           ^

llvm-svn: 105946