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Matthias Braun f290912d22 ARM: Introduce conservative load/store optimization mode 
Most of the time ARM has the CCR.UNALIGN_TRP bit set to false which
means that unaligned loads/stores do not trap and even extensive testing
will not catch these bugs. However the multi/double variants are not
affected by this bit and will still trap. In effect a more aggressive
load/store optimization will break existing (bad) code.

These bugs do not necessarily manifest in the broken code where the
misaligned pointer is formed but often later in perfectly legal code
where it is accessed. This means recompiling system libraries (which
have no alignment bugs) with a newer compiler will break existing
applications (with alignment bugs) that worked before.

So (under protest) I implemented this safe mode which limits the
formation of multi/double operations to cases that are not affected by
user code (stack operations like spills/reloads) or cases where the
normal operations trap anyway (floating point load/stores). It is
disabled by default.

Differential Revision: http://reviews.llvm.org/D17015

llvm-svn: 262504
 		2016-03-02 19:20:00 +00:00
..
2009-07-17-CrossRegClassCopy.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-07-21-ISelBug.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2009-07-23-CPIslandBug.ll
…
2009-07-30-PEICrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-08-01-WrongLDRBOpc.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-08-02-CoalescerBug.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-08-04-CoalescerAssert.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2009-08-04-CoalescerBug.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2009-08-04-ScavengerAssert.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2009-08-04-SubregLoweringBug.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
2009-08-04-SubregLoweringBug2.ll
…
2009-08-04-SubregLoweringBug3.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-08-06-SpDecBug.ll ARM: When spilling extra registers for alignment, prefer low registers on all Thumb targets. 2015-04-23 20:31:26 +00:00
2009-08-07-CoalescerBug.ll
…
2009-08-07-NeonFPBug.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-08-08-ScavengerAssert.ll
…
2009-08-10-ISelBug.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-08-21-PostRAKill4.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2009-09-01-PostRAProlog.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2009-09-28-ITBlockBug.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-10-15-ITBlockBranch.ll
…
2009-11-01-CopyReg2RegBug.ll
…
2009-11-11-ScavengerAssert.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-11-13-STRDBug.ll
…
2009-12-01-LoopIVUsers.ll [SCEV] Try to reuse existing value during SCEV expansion 2016-02-04 01:27:38 +00:00
2010-01-06-TailDuplicateLabels.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2010-01-19-RemovePredicates.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
2010-02-11-phi-cycle.ll
…
2010-02-24-BigStack.ll
…
2010-03-08-addi12-ccout.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2010-03-15-AsmCCClobber.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2010-04-15-DynAllocBug.ll ARM & AArch64: make use of common cmpxchg idioms after expansion 2014-05-30 10:09:59 +00:00
2010-04-26-CopyRegCrash.ll
…
2010-05-24-rsbs.ll
…
2010-06-14-NEONCoalescer.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2010-06-19-ITBlockCrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2010-06-21-TailMergeBug.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2010-08-10-VarSizedAllocaBug.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2010-11-22-EpilogueBug.ll ARM & AArch64: make use of common cmpxchg idioms after expansion 2014-05-30 10:09:59 +00:00
2010-12-03-AddSPNarrowing.ll
…
2011-04-21-FILoweringBug.ll
…
2011-06-07-TwoAddrEarlyClobber.ll Thumb2: When optimizing for size, do not if-convert branches involving comparisons with zero. 2015-04-23 20:31:30 +00:00
2011-12-16-T2SizeReduceAssert.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2012-01-13-CBNZBug.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
2013-02-19-tail-call-register-hint.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2013-03-02-vduplane-nonconstant-source-index.ll Fix a nasty bug in DAGCombine of STORE nodes. 2015-03-19 22:48:57 +00:00
2013-03-06-vector-sext-operand-scalarize.ll
…
aapcs.ll ARMLoadStoreOptimizer: Create LDRD/STRD on thumb2 2015-07-21 00:18:59 +00:00
aligned-constants.ll [MC] Use .p2align instead of .align 2016-01-26 00:03:25 +00:00
aligned-spill.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
bfi.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
bfx.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
buildvector-crash.ll ARM & AArch64: make use of common cmpxchg idioms after expansion 2014-05-30 10:09:59 +00:00
carry.ll Address buildbot fallout from r259065 2016-01-28 18:59:04 +00:00
cbnz.ll Thumb2: When applying branch optimizations, visit branches in reverse order. 2015-04-23 20:31:35 +00:00
constant-islands-jump-table.ll ARM: recommit r237590: allow jump tables to be placed as constant islands. 2015-05-31 19:22:07 +00:00
constant-islands-new-island-padding.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
constant-islands-new-island.ll ARM: allow constpool entry to be moved to the user's block in all cases. 2014-11-13 17:58:53 +00:00
constant-islands.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
cortex-fp.ll [ARM] Add support for Cortex-M7, FPv5-SP and FPv5-DP (LLVM) 2014-10-01 09:02:17 +00:00
crash.ll [ARM][NEON] Use address space in vld([1234]|[234]lane) and vst([1234]|[234]lane) instructions 2015-09-30 10:56:37 +00:00
cross-rc-coalescing-1.ll
…
cross-rc-coalescing-2.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
div.ll [ARM] support for Cortex-R4/R4F 2015-04-09 14:07:28 +00:00
emit-unwinding.ll [ARM] Handle t2ADDri in ARMAsmPrinter::EmitUnwindingInstruction. 2015-11-10 00:10:41 +00:00
float-cmp.ll [SDAG] Optimize unordered comparison in soft-float mode (patch by Anton Nadolskiy) 2015-07-15 08:39:35 +00:00
float-intrinsics-double.ll LegalizeDAG: Fix and improve FCOPYSIGN/FABS legalization 2015-11-12 01:02:47 +00:00
float-intrinsics-float.ll [ARM] Use correct half-precision functions in EABI mode 2015-10-07 16:58:49 +00:00
float-ops.ll ARMLoadStoreOptimizer: Fix errata 602117 handling and make testcase actually test for it 2015-06-24 20:03:27 +00:00
frameless.ll
…
frameless2.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
ifcvt-compare.ll [ARM] Enable shrink-wrapping by default. 2015-11-18 00:40:54 +00:00
ifcvt-neon.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
inflate-regs.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
inlineasm.ll
…
large-call.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
large-stack.ll ARM: When spilling extra registers for alignment, prefer low registers on all Thumb targets. 2015-04-23 20:31:26 +00:00
ldr-str-imm12.ll ARM & AArch64: make use of common cmpxchg idioms after expansion 2014-05-30 10:09:59 +00:00
lit.local.cfg Reduce verbiage of lit.local.cfg files 2014-06-09 22:42:55 +00:00
longMACt.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
lsr-deficiency.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
machine-licm.ll [ARM][NEON] Use address space in vld([1234]|[234]lane) and vst([1234]|[234]lane) instructions 2015-09-30 10:56:37 +00:00
mul_const.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
pic-load.ll ARM: Add scheduling information for LDRLIT instructions to swift scheduling model 2015-07-17 23:18:26 +00:00
segmented-stacks.ll Move the segmented stack switch to a function attribute 2014-04-10 22:58:43 +00:00
setjmp_longjmp.ll Arm: Don't define a label twice with two setjmps in a function. 2015-07-16 22:34:20 +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
tail-call-r9.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-adc.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-add.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-add2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-add3.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-add4.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-add5.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-add6.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-and.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-and2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-asr.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-asr2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-bcc.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-bfc.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-bic.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-branch.ll ARM & AArch64: make use of common cmpxchg idioms after expansion 2014-05-30 10:09:59 +00:00
thumb2-call-tc.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-call.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-cbnz.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
thumb2-clz.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-cmn.ll IR: Make metadata typeless in assembly 2014-12-15 19:07:53 +00:00
thumb2-cmn2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-cmp.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-cmp2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-eor.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-eor2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-ifcvt1-tc.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-ifcvt1.ll [ARM] Enable shrink-wrapping by default. 2015-11-18 00:40:54 +00:00
thumb2-ifcvt2.ll [ARM] Enable shrink-wrapping by default. 2015-11-18 00:40:54 +00:00
thumb2-ifcvt3.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-jtb.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-ldm.ll ARM: Introduce conservative load/store optimization mode 2016-03-02 19:20:00 +00:00
thumb2-ldr.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-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
thumb2-ldr_post.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-ldr_pre.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-ldrb.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-ldrd.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-ldrh.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-lsl.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-lsl2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-lsr.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-lsr2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-lsr3.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-mla.ll ARM: fix test case missed in previous roundup 2014-04-04 01:19:56 +00:00
thumb2-mls.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-mov.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-mul.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-mulhi.ll [ARM] Renaming +t2dsp feature into +dsp, as discussed on llvm-dev 2015-10-23 17:19:19 +00:00
thumb2-mvn.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-mvn2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-neg.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-orn.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-orn2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-orr.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-orr2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-pack.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-rev.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-rev16.ll Enabling thumb2 mode used to force support for armv6t2. Replace this 2013-12-13 11:16:00 +00:00
thumb2-ror.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-rsb.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-rsb2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-sbc.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-select.ll ARM: update even more tests 2014-04-03 17:35:22 +00:00
thumb2-select_xform.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-shifter.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-smla.ll [ARM] Renaming +t2dsp feature into +dsp, as discussed on llvm-dev 2015-10-23 17:19:19 +00:00
thumb2-smul.ll [ARM] Renaming +t2dsp feature into +dsp, as discussed on llvm-dev 2015-10-23 17:19:19 +00:00
thumb2-spill-q.ll [ARM][NEON] Use address space in vld([1234]|[234]lane) and vst([1234]|[234]lane) instructions 2015-09-30 10:56:37 +00:00
thumb2-str.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
thumb2-str_post.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-str_pre.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
thumb2-strb.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
thumb2-strh.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
thumb2-sub.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-sub2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-sub3.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-sub4.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-sub5.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-sxt-uxt.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-sxt_rot.ll ARM: spot SBFX-compatbile code expressed with sign_extend_inreg 2014-07-23 13:59:12 +00:00
thumb2-tbb.ll [MC] Use .p2align instead of .align 2016-01-26 00:03:25 +00:00
thumb2-tbh.ll ARM: recommit r237590: allow jump tables to be placed as constant islands. 2015-05-31 19:22:07 +00:00
thumb2-teq.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-teq2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-tst.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-tst2.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
thumb2-uxt_rot.ll Fix test case label check 2015-11-20 20:24:49 +00:00
thumb2-uxtb.ll ARM: yet another round of ARM test clean ups 2014-04-03 23:47:24 +00:00
tls1.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
tls2.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
tpsoft.ll ARM: When spilling extra registers for alignment, prefer low registers on all Thumb targets. 2015-04-23 20:31:26 +00:00
v8_IT_1.ll [ARM][NEON] Use address space in vld([1234]|[234]lane) and vst([1234]|[234]lane) instructions 2015-09-30 10:56:37 +00:00
v8_IT_2.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
v8_IT_3.ll Distribute the weight on the edge from switch to default statement to edges generated in lowering switch. 2015-09-01 01:42:16 +00:00
v8_IT_4.ll Enable generating legacy IT block for AArch32 2013-11-13 18:29:49 +00:00
v8_IT_5.ll [ARM] Enable shrink-wrapping by default. 2015-11-18 00:40:54 +00:00
v8_IT_6.ll ARMv8 IfConversion must skip narrow instructions that a) define CPSR and b) wouldn't affect CPSR in an IT block 2014-02-26 11:27:28 +00:00