Change the x86 backend to use extract_subreg for truncation operations. Passes DejaGnu, SingleSource and MultiSource.

llvm-svn: 40578

llvm-svn: 40572

to make it easier to understand failure.

llvm-svn: 40567

llvm-svn: 40566

llvm-svn: 40564

llvm-svn: 40560

This commit fixes two things.  One is a pair of VStudio compiler errors stemming from variables
which defined within the for loop statement and also within the body of the for loop.  I fixed these 
by renaming one of the two variables.  Additionally, I've made the Function*->ExFunc map in 
ExternalFunctions.cpp a ManagedStatic object, so that cleanup will be done on llvm_shutdown.  In repeated
uses of the interpreter, where the same Function* address may get used for completely differnet functions,
this was causing a crash.

llvm-svn: 40558

llvm-svn: 40556

Make the alignedload and alignedstore patterns always require 16-byte
alignment. This way when they are used in the "Fs" instructions, in which
a vector instruction is used for a scalar purpose, they can still require
the full vector alignment. And add a regression test for this.

llvm-svn: 40555

with StructReturn and ByVal, so make it so.

llvm-svn: 40554

Verifier::visitFunction is suffering a combinatorial
explosion due to the number of mutually incompatible
attributes.  This patch tidies the whole thing up
using attribute masks.  While there I fixed some
small bugs: (1) the ByVal attribute tests cast a
type to a pointer type, which can fail.  Yes, the
fact it is of a pointer type is checked before,
but a failing check does not cause the program
to exit, it continues on outputting further errors;
(2) Nothing was checking that an sret attribute is
on the first parameter; (3) nothing was checking that
a function for which isStructReturn() is true has a
parameter with the sret attribute and vice-versa (I
don't think it is possible for this to go wrong, but
it seems right to check it).

llvm-svn: 40553

still under discussion.

llvm-svn: 40549

llvm-svn: 40548

llvm-svn: 40547

llvm-svn: 40546

llvm-svn: 40542

almost the same things from LCSSA.

llvm-svn: 40540

llvm-svn: 40538

llvm-svn: 40537

llvm-svn: 40535

offsets. The SrcValueOffset values are the real offsets from the
SrcValue base pointers.

llvm-svn: 40534

to Instruction::mayWriteToMemory, fixing a FIXME, and helping
various places that call mayWriteToMemory directly.

llvm-svn: 40533

from Relation::contradicts in Relation::incorporate.

llvm-svn: 40531

llvm-svn: 40530

don't get decorated as if for immediate fields for instructions.

llvm-svn: 40529

llvm-svn: 40528

Add a MachineFunction pass, which runs post register allocation, that turns subreg insert/extract instruction into register copies. This ensures correct code gen if the coalescer isn't able to remove all subreg instructions.

llvm-svn: 40521

llvm-svn: 40520

llvm-svn: 40518

llvm-svn: 40517

llvm-svn: 40516

llvm-svn: 40514

Fix infinite recursion for when extract_vector_elt is legal. Unfortunately no public targets use this code-path, so no test.

llvm-svn: 40510

llvm-svn: 40506

x86 target, replacing them with the new alignment attributes on memory
references.

llvm-svn: 40504

llvm-svn: 40503

llvm-svn: 40502

llvm-svn: 40501

llvm-svn: 40500

llvm-svn: 40499