breaker needs to check all definitions of the antidepenent register to
avoid multiple defs of the same new register.

llvm-svn: 118032

llvm-svn: 118031

PR 8522 / 8616046.  Test reduction, analysis and patch by Tim Deegan!
(However, review by someone who understands the classes here better
is welcome.  John Krum will return!)

llvm-svn: 118030

llvm-svn: 118029

llvm-svn: 118027

assumptions about stack layout. Specifically, LR must be saved next to FP.

llvm-svn: 118026

llvm-svn: 118025

merging it into a Token field in Operand, and moving the first
token to an explicit mnemonic field.  These were parallel
arrays before (except for the mnemonic) which kept confusing me.

llvm-svn: 118024

llvm-svn: 118023

llvm-svn: 118022

llvm-svn: 118020

llvm-svn: 118016

llvm-svn: 118014

llvm-svn: 118013

llvm-svn: 117997

handling those cases for now.

llvm-svn: 117996

llvm-svn: 117995

to what someone would need to do to support thumb1.

llvm-svn: 117994

llvm-svn: 117993

BB#1: derived from LLVM BB %bb.nph28
    Live Ins: %AL
    Predecessors according to CFG: BB#0
	TEST8rr %reg16384<kill>, %reg16384, %EFLAGS<imp-def>; GR8:%reg16384
	JNE_4 <BB#2>, %EFLAGS<imp-use,kill>
	JMP_4 <BB#2>
    Successors according to CFG: BB#2 BB#2

These double CFG edges only ever occur in bugpoint-generated code, so there is
no need to attempt something clever.

llvm-svn: 117992

since we can neither generate nor parse them at the moment.

llvm-svn: 117988

llvm-svn: 117987

llvm-svn: 117986

llvm-svn: 117985

llvm-svn: 117984

edges on demand.

llvm-svn: 117982

It is legal for an instruction to have two operands using the same register,
only one a kill. This is interpreted as a kill.

llvm-svn: 117981

source, and let rewrite() clean it up.

This way, kill flags on the inserted copies are fixed as well during rewrite().

We can't just assume that all the copies we insert are going to be kills since
critical edges into loop headers sometimes require both source and dest to be
live out of a block.

llvm-svn: 117980

FWIW, X86 has 254 ambiguous instructions.

llvm-svn: 117979

for handling the fixup necessary.

llvm-svn: 117978

llvm-svn: 117977

This is another part of the fix for Radar 8599955.

llvm-svn: 117976

llvm-svn: 117975

llvm-svn: 117971

llvm-svn: 117969

llvm-svn: 117968

llvm-svn: 117967

llvm-svn: 117964

At least X86FloatingPoint requires correct kill flags after register allocation,
and targets using register scavenging benefit. Conservative kill flags are not
enough.

llvm-svn: 117960

llvm-svn: 117959