Scott Douglass 9091dc1c0e [ARM] Modify codegen for memcpy intrinsic to prefer LDM/STM. ... We were previously codegen'ing memcpy as regular load/store operations and hoping that the register allocator would allocate registers in ascending order so that we could apply an LDM/STM combine after register allocation. According to the commit that first introduced this code (r37179), we planned to teach the register allocator to allocate the registers in ascending order. This never got implemented, and up to now we've been stuck with very poor codegen. A much simpler approach for achieving better codegen is to create MEMCPY pseudo instructions, attach scratch virtual registers to them and then, post register allocation, expand the MEMCPYs into LDM/STM pairs using the scratch registers. The register allocator will have picked arbitrary registers which we sort when expanding the MEMCPY. This approach also avoids the need to repeatedly calculate offsets which ultimately ought to be eliminated pre-RA in order to decrease register pressure. Fixes PR9199 and PR23768. [This is based on Peter Collingbourne's r238473 which was reverted.] Differential Revision: http://reviews.llvm.org/D13239 Change-Id: I727543c2e94136e0f80b8e22d5642d7b9ee5b458 Author: Peter Collingbourne <peter@pcc.me.uk> llvm-svn: 249322		2015-10-05 14:49:54 +00:00
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2007-01-31-RegInfoAssert.ll	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
2007-02-02-JoinIntervalsCrash.ll
2007-05-05-InvalidPushPop.ll	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
2009-06-18-ThumbCommuteMul.ll
2009-07-20-TwoAddrBug.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
2009-07-27-PEIAssert.ll
2009-08-12-ConstIslandAssert.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
2009-08-12-RegInfoAssert.ll	[opaque pointer type] Add textual IR support for explicit type parameter to gep operator	2015-03-13 18:20:45 +00:00
2009-08-20-ISelBug.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
2009-12-17-pre-regalloc-taildup.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
2010-06-18-SibCallCrash.ll
2010-07-01-FuncAlign.ll
2010-07-15-debugOrdering.ll	DI: Require subprogram definitions to be distinct	2015-08-28 20:26:49 +00:00
2011-05-11-DAGLegalizer.ll	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
2011-06-16-NoGPRs.ll	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
2011-EpilogueBug.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
2012-04-26-M0ISelBug.ll	Improve logic that decides if its profitable to commute when some of the virtual registers involved have uses/defs chains connecting them to physical register. Fix up the tests that this change improves.	2014-11-05 06:43:02 +00:00
2014-06-10-thumb1-ldst-opt-bug.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
asmprinter-bug.ll	[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction	2015-04-16 23:24:18 +00:00
barrier.ll
copy_thumb.ll
cortex-m0-unaligned-access.ll	[ARM] Define subtarget feature strict-align.	2015-07-28 22:44:28 +00:00
DbgValueOtherTargets.test
dyn-stackalloc.ll	[opaque pointer type] Add textual IR support for explicit type parameter to gep operator	2015-03-13 18:20:45 +00:00
fastcc.ll	IR: Make metadata typeless in assembly	2014-12-15 19:07:53 +00:00
fpconv.ll
fpow.ll
frame_thumb.ll
iabs.ll	Re-add support to llvm-objdump for Mach-O universal files and archives with -macho	2014-12-04 23:56:27 +00:00
inlineasm-imm-thumb.ll
inlineasm-thumb.ll	[ARM, inline-asm] Fix ARMTargetLowering::getRegForInlineAsmConstraint to return	2014-11-03 20:37:04 +00:00
ispositive.ll
large-stack.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
ldm-merge-call.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
ldm-merge-struct.ll	[opaque pointer type] Add textual IR support for explicit type parameter to gep operator	2015-03-13 18:20:45 +00:00
ldm-stm-base-materialization-thumb2.ll	[ARM] Modify codegen for memcpy intrinsic to prefer LDM/STM.	2015-10-05 14:49:54 +00:00
ldm-stm-base-materialization.ll	[ARM] Modify codegen for memcpy intrinsic to prefer LDM/STM.	2015-10-05 14:49:54 +00:00
ldr_ext.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
ldr_frame.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
lit.local.cfg
long_shift.ll
long-setcc.ll
long.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
mature-mc-support.ll
mul.ll
pop.ll	[ARM] Refactor the prologue/epilogue emission to be more robust.	2015-07-20 21:42:14 +00:00
PR17309.ll	[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction	2015-02-27 19:29:02 +00:00
push.ll
rev.ll
segmented-stacks-dynamic.ll
segmented-stacks.ll	ARM: correctly align constant pool value on Thumb1 targets.	2015-10-02 18:07:13 +00:00
select.ll
sjljehprepare-lower-vector.ll	Move the personality function from LandingPadInst to Function	2015-06-17 20:52:32 +00:00
stack_guard_remat.ll	[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction	2015-02-27 19:29:02 +00:00
stack-access.ll	[ARM] Fix handling of thumb1 out-of-range frame offsets	2015-03-20 17:20:07 +00:00
stack-coloring-without-frame-ptr.ll
stack-frame.ll
stm-merge.ll	[opaque pointer type] Add textual IR support for explicit type parameter to load instruction	2015-02-27 21:17:42 +00:00
thumb-imm.ll
thumb-ldm.ll	[opaque pointer type] Add textual IR support for explicit type parameter to gep operator	2015-03-13 18:20:45 +00:00
thumb-shrink-wrapping.ll	[ARM] Make the frame lowering code ready for shrink-wrapping.	2015-07-22 16:34:37 +00:00
trap.ll
triple.ll
tst_teq.ll
unord.ll
vargs.ll	[ARM] Refactor the prologue/epilogue emission to be more robust.	2015-07-20 21:42:14 +00:00