Commit Graph

156421 Commits

Author SHA1 Message Date
Diana Picus
a7372f15c9 [globalisel][tablegen] Skip src child predicates
The GlobalISel TableGen backend didn't check for predicates on the
source children. This caused it to generate code for ARM patterns such
as SMLABB or similar, but without properly checking for the sext_16_node
part of the operands. This in turn meant that we would select SMLABB
instead of MLA for simple sequences such as s32 + s32 * s32, which is
wrong (we want a MLA on the full operands, not just their bottom 16
bits).

This patch forces TableGen to skip patterns with predicates on the src
children, so it doesn't generate code for SMLABB and other similar ARM
instructions at all anymore. AArch64 and X86 are not affected.

Differential Revision: https://reviews.llvm.org/D39554

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317313 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 10:30:19 +00:00
Diana Picus
5281112161 [ARM GlobalISel] Move the check for Thumb higher up
We're currently bailing out for Thumb targets while lowering formal
parameters, but there used to be some other checks before it, which
could've caused some functions (e.g. those without formal parameters) to
sneak through unnoticed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317312 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 10:30:12 +00:00
Ivan A. Kosarev
74ecc3ab6b [Analysis] Refine matching and merging of TBAA tags
This patch combines the code that matches and merges TBAA access
tags. The aim is to simplify future changes and making sure that
these operations produce consistent results.

Differential Revision: https://reviews.llvm.org/D39463


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317311 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 10:26:25 +00:00
Francis Visoiu Mistrih
ba9125e489 [PEI] Simplify handling of targets with no phys regs. NFC
Make doSpillCalleeSavedRegs a member function, instead of passing most of the
members of PEI as arguments.

Differential Review: https://reviews.llvm.org/D35642

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317309 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 09:46:36 +00:00
Martin Storsjo
19a3ba35df [AArch64] Use dwarf exception handling on MinGW
Ideally we should probably produce WinEH here as well, but until
then, we can use dwarf exceptions, without any further changes
required in clang, libunwind or libcxxabi.

Differential Revision: https://reviews.llvm.org/D39535

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317304 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 07:33:20 +00:00
Max Kazantsev
691ff5f850 [NFC] Get rid of hard-coded value ID in test
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317303 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 07:30:45 +00:00
Martin Storsjo
f30757f3b0 [llvm-nm] Don't error out on multiple occurrances of the -g/--external-only flag
GNU binutils nm doesn't error out on this, and some projects' build
systems can end up doing that in some cases. Allowing that seems like
a better target than trying to avoid user projects passing multiple
-g parameters to $NM.

Differential Revision: https://reviews.llvm.org/D39539

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317301 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 07:18:21 +00:00
Martin Storsjo
37104fff45 [llvm-nm] Print 'I' for import table data in COFF
The character gets uppercased into 'I' when it's a global symbol.

In GNU binutils, nm prints 'I' for symbols classified by
bfd_is_ind_section - which probably isn't exactly/only import
tables.

When building for win32, (some incarnations of?) libtool has got
rules that try to inspect linked libraries, and in order to
be sure that it is linking to a DLL import library as opposed to
a static library, it expects to find the string " I " in the output
of $NM when run on such an import library.

GNU binutils nm also flags all of the .idata$X chunks as 'i' (while
this patch only makes it set on .idata$2 and .idata$6) and also
flags __imp__function as 'I'.

Differential Revision: https://reviews.llvm.org/D39540

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317300 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 07:18:14 +00:00
Craig Topper
c43a693efb [X86] Remove PALIGNR/VALIGN handling from combineBitcastForMaskedOp and move to isel patterns instead. Prefer 128-bit VALIGND/VALIGNQ over PALIGNR during lowering when possible.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317299 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 06:48:02 +00:00
Craig Topper
06d5ebdc63 [TableGen] Add an extra blank line to DAGISel output file to separate functions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317298 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 05:19:34 +00:00
Vedant Kumar
931b302025 [LSR] Clarify a comment. NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317295 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 01:01:28 +00:00
Sriraman Tallam
1bd292583c Avoid PLT for external calls when attribute nonlazybind is used.
Differential Revision: https://reviews.llvm.org/D39065

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317292 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-03 00:10:19 +00:00
Jake Ehrlich
c7ddffcd32 Reland "Add feature to determine if host architecture is 64-bit in llvm-lit"
A member of config was removed in this patch which resulted in errors I
didn't expect. Removing config.host_arch will take more work some I'm
readding that field.

Differential Revision: https://reviews.llvm.org/D39465

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317289 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:45:51 +00:00
Vedant Kumar
b57c6f4150 [Verifier] Remove the -verify-debug-info cl::opt
This cl::opt has been dead for a while. It's no longer possible to run
the verifier without also verifying debug info.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317288 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:44:20 +00:00
Quentin Colombet
d8375d7368 [AArch64][RegisterBankInfo] Add mapping for G_FPEXT.
This fixes http://llvm.org/PR32560. We were missing a description for
half floating point type and as a result were using the FPR 32 mapping.
Because of the size mismatch the generic code was complaining that the
default mapping is not appropriate. Fix the mapping description so that
the default mapping can be properly applied.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317287 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:38:19 +00:00
Quentin Colombet
87cdca2231 [AArch64][RegisterBankInfo] Add FPR16 support in value mapping.
NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317286 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:38:13 +00:00
Puyan Lotfi
0ae3f32f56 mir-canon: First commit.
mir-canon (MIRCanonicalizerPass) is a pass designed to reorder instructions and
rename operands so that two similar programs will diff more cleanly after being
run through mir-canon than they would otherwise. This project is still a work
in progress and there are ideas still being discussed for improving diff
quality.

M    include/llvm/InitializePasses.h
M    lib/CodeGen/CMakeLists.txt
M    lib/CodeGen/CodeGen.cpp
A    lib/CodeGen/MIRCanonicalizerPass.cpp


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317285 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:37:32 +00:00
Jake Ehrlich
89fd072604 [llvm-objcopy] Fix bug in how segment alignment was being handled
Just aligning segment offsets to segment alignment is incorrect and also
wastes more space than is needed. The requirement is that p_offset ==
p_addr modulo p_align *not* that p_offset == 0 modulo p_align. Generally
speaking we've been using p_addr == 0 modulo p_align. In fact yaml2obj
can't even produce a valid situation which causes llvm-objcopy to
produce incorrect results because alignment and offset were both
inherited from the sections the program header covers. This change fixes
this bad behavior in llvm-objcopy.

Differential Revision: https://reviews.llvm.org/D39132

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317284 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:24:04 +00:00
Craig Topper
6d06c89303 [X86] Give AVX512VL instructions priority over their AVX equivalents.
I thought we had gotten all these priority bugs worked out, but I guess not.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317283 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:23:37 +00:00
Adrian Prantl
a555cf0683 IndVarSimplify: preserve debug information attached to widened PHI nodes.
This fixes PR35015.

https://bugs.llvm.org/show_bug.cgi?id=35015

Differential Revision: https://reviews.llvm.org/D39345

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317282 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:17:06 +00:00
Jake Ehrlich
56898c1245 Add feature to determine if host architecture is 64-bit in llvm-lit
I have a test that I'd like to add to llvm that demands using more than
32-bits worth of address space. This test can't be run on 32-bit systems
because they don't have enough address space. The host triple should be
used to determine this instead of config.host_arch because on Debian
systems config.host_arch is not correct. This change adds the
"host-arch-is-64bit" feature to allow tests to restrict themselves to
the 64-bit case.

Differential Revision: https://reviews.llvm.org/D39465

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317281 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 23:14:55 +00:00
Konstantin Zhuravlyov
f79fab6f98 AMDGPU: Fix warning discovered by r317266 [-Wunused-private-field]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317280 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 22:35:22 +00:00
Hiroshi Yamauchi
dd33e177dd Irreducible loop metadata for more accurate block frequency under PGO.
Summary:
Currently the block frequency analysis is an approximation for irreducible
loops.

The new irreducible loop metadata is used to annotate the irreducible loop
headers with their header weights based on the PGO profile (currently this is
approximated to be evenly weighted) and to help improve the accuracy of the
block frequency analysis for irreducible loops.

This patch is a basic support for this.

Reviewers: davidxl

Reviewed By: davidxl

Subscribers: mehdi_amini, llvm-commits, eraman

Differential Revision: https://reviews.llvm.org/D39028

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317278 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 22:26:51 +00:00
Krzysztof Parzyszek
da35e5e8be [Hexagon] Prefer L2_loadrub_io over L4_loadrub_rr
If the offset is an immediate, avoid putting it in a register
to get Rs+Rt<<#0.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317275 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 21:56:59 +00:00
Shoaib Meenai
fbb50d9079 [tools] Add option to install binutils symlinks
The LLVM tools can be used as a replacement for binutils, in which case
it's convenient to create symlinks with the binutils names. Add support
for these symlinks in the build system. As with any other llvm tool
symlinks, the user can limit the installed symlinks by only adding the
desired ones to `LLVM_TOOLCHAIN_TOOLS`.

Differential Revision: https://reviews.llvm.org/D39530

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317272 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 21:43:32 +00:00
Adrian Prantl
dc666ea9df Clean up comments in include/llvm-c/DebugInfo.h
Patch by Harlan Haskins!

Differential Revision: https://reviews.llvm.org/D39568

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317271 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 21:35:37 +00:00
Anna Thomas
b69a2a9ae3 [LoopPredication] Enable predication when latchCheckIV is wider than rangeCheck
Summary:
This patch allows us to predicate range checks that have a type narrower than
the latch check type. We leverage SCEV analysis to identify a truncate for the
latchLimit and latchStart.
There is also safety checks in place which requires the start and limit to be
known at compile time. We require this to make sure that the SCEV truncate expr
for the IV corresponding to the latch does not cause us to lose information
about the IV range.
Added tests show the loop predication over range checks that are of various
types and are narrower than the latch type.
This enhancement has been in our downstream tree for a while.

Reviewers: apilipenko, sanjoy, mkazantsev

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39500

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317269 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 21:21:02 +00:00
Adrian Prantl
2e63034efd Add missing header guards.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317267 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 20:58:58 +00:00
Konstantin Zhuravlyov
37bbee84d8 AMDGPU: Remove outdated fixme (it was already fixed)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317266 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 20:48:06 +00:00
Shoaib Meenai
c626458f76 [cmake] Remove policy conditionals
LLVM now requires a minimum of cmake 3.4.3, and all the policies
currently being set are present in that cmake version, so the
conditionals will always be true and are therefore unnecessary. The
movation is that the conditionals can give the false impression that the
policy settings are optional, whereas for example it's necessary to set
CMP0056 in order for `check_linker_flags` to operate correctly after
r316972. Inline the project version and language setting in the process.

Differential Revision: https://reviews.llvm.org/D39442

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317264 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 20:33:36 +00:00
Hans Wennborg
15f5deb8cb Fix llvm-dsymutil test in -DLLVM_ENABLE_THREADS=OFF mode
After r316999, tools/dsymutil/X86/alias.test started failing in builds
that have threading disabled.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317263 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 20:22:03 +00:00
Martin Storsjo
ce68f2c629 [test] Move llvm-lib tests into tools/llvm-lib. NFC.
Similarly to SVN r317189 for llvm-dlltool, these are probably
easier to find in a tools subdirectory with a name identical to
the tool, than in a toplevel directory with a different name.

This matches the move of LibDriver itself in SVN r302995.

Differential Revision: https://reviews.llvm.org/D39531



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317262 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 20:05:20 +00:00
Craig Topper
2bbdf00230 [X86] Simplify the pentium4 code in getHostCPUName to be based on feature flags. Don't use 'x86-64' ever.
'x86-64' has started to reflect a sort of generic tuning flag for more modern 64-bit CPUs. We probably shouldn't be using it as the name of an unidentifiable pentium4. So use nocona for all 64-bit pentium4s instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317230 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 19:13:34 +00:00
Craig Topper
161385fddd [X86] Change getHostCPUName fallback code to not select 'x86-64' for unknown CPUs in family 6 that has 64-bit support but not any newer SSE features. Use 'core2' instead
We know that's the earliest CPU with 64-bit support. x86-64 has taken on a role of representing a more modern 64-bit CPU so we probably shouldn't be using that when we can't identify things.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317229 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 19:13:32 +00:00
Jonas Devlieghere
2f759d471a [dsymutil][doc] Improve wording in manpage and rename file.
- Improve wording
 - Rename llvm-dsymutil to dsymutil
 - Name -arch=<arch> argument

Differential revision: https://reviews.llvm.org/D39561

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317226 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 18:44:54 +00:00
Anna Thomas
0c059eff81 Strip off invariant.start because memory locations arent invariant
The original change was reverted in rL317217 because of the failure in
the RS4GC testcase. I couldn't reproduce the failure on my local machine
(macbook) but could reproduce it on a linux box.

The failure was around removing the uses of invariant.start. The fix
here is to just RAUW undef (which was the first implementation in D39388).
This is perfectly valid IR as discussed in the review.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317225 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 18:24:04 +00:00
Mitch Phillips
4c88213d82 Fixed line length style issue.
Reviewers: zturner

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39395

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317223 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 18:04:44 +00:00
Chad Rosier
0416327f19 [TargetParser][AArch64] Reorder enum to preserve 5.0.0 libLLVM ABI.
This is required for backporting r311659 to the 5.0.1 release.
PR35060

Differential Revision: https://reviews.llvm.org/D39558

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317222 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 17:52:27 +00:00
Jonas Devlieghere
9cca1f183a [dsymutil] Add a manpage for dsymutil
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317221 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 17:12:34 +00:00
Anna Thomas
685fd43490 Revert "[RS4GC] Strip off invariant.start because memory locations arent invariant"
This reverts commit r317215, investigating the test failure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317217 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 16:45:51 +00:00
Anna Thomas
2880b72d32 [RS4GC] Strip off invariant.start because memory locations arent invariant
Summary:
Invariant.start on memory locations has the property that the memory
location is unchanging. However, this is not true in the face of
rewriting statepoints for GC.
Teach RS4GC about removing invariant.start so that optimizations after
RS4GC does not incorrect sink a load from the memory location past a
statepoint.

Added test showcasing the issue.

Reviewers: reames, apilipenko, dneilson

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39388

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317215 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 16:23:31 +00:00
Clement Courbet
c022286730 Revert "[ExpandMemCmp] Split ExpandMemCmp from CodeGen into its own pass."
undefined reference to `llvm::TargetPassConfig::ID' on
clang-ppc64le-linux-multistage

This reverts commit eea333c33fa73ad225ef28607795984829f65688.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317213 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 15:53:10 +00:00
Clement Courbet
f08c3d1d13 [ExpandMemCmp] Split ExpandMemCmp from CodeGen into its own pass.
Summary:
This is mostly a noop (most of the test diffs are renamed blocks).
There are a few temporary register renames (eax<->ecx) and a few blocks are
shuffled around.

See the discussion in PR33325 for more details.

Reviewers: spatel

Subscribers: mgorny

Differential Revision: https://reviews.llvm.org/D39456

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317211 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 15:02:51 +00:00
Ayman Musa
a223e90991 [X86] Fix bug in legalize vector types - Split large loads
When splitting a large load to smaller legally-typed loads, the last load should be padded to reach the size of the previous one so a CONCAT_VECTORS node could reunite them again.
The code currently pads the last load to reach the size of the first load (instead of the previous).

Differential Revision: https://reviews.llvm.org/D38495

Change-Id: Ib60b55ed26ce901fabf68108daf52683fbd5013f

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317206 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 13:07:06 +00:00
Simon Dardis
652842ec9a [mips] Use register scavenging with MSA.
MSA stores and loads to the stack are more likely to require an
emergency GPR spill slot due to the smaller offsets available
with those instructions.

Handle this by overestimating the size of the stack by determining
the largest offset presuming that all callee save registers are
spilled and accounting of incoming arguments when determining
whether an emergency spill slot is required.

Reviewers: atanasyan

Differential Revision: https://reviews.llvm.org/D39056


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317204 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 12:47:22 +00:00
Sam McCall
66af8bde13 Temporary workaround for msan false positive.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317203 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 12:29:47 +00:00
Michael Zuckerman
122fe39c72 Adding test for extraxt sub vector load and store avx512
Change-Id: Iefcb0ec6b6aa1b530ce5358081f02e6e522a8e50

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317202 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 12:19:36 +00:00
Yichao Yu
52f6f2ce7b Allow inaccessiblememonly and inaccessiblemem_or_argmemonly to be overwriten on call site with operand bundle
Summary:
Similar to argmemonly, readonly and readnone.

Fix PR35128

Reviewers: andrew.w.kaylor, chandlerc, hfinkel

Reviewed By: hfinkel

Subscribers: hfinkel, llvm-commits

Differential Revision: https://reviews.llvm.org/D39434

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317201 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 12:18:33 +00:00
Francis Visoiu Mistrih
4352a046c5 [AsmPrinterDwarf] Add support for .cfi_restore directive
As of today we only use .cfi_offset to specify the offset of a CSR, but
we never use .cfi_restore when the CSR is restored.

If we want to perform a more advanced type of shrink-wrapping, we need
to use .cfi_restore in order to switch the CFI state between blocks.

This patch only aims at adding support for the directive.

Differential Revision: https://reviews.llvm.org/D36114

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317199 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 12:00:58 +00:00
Bjorn Pettersson
1e702fd905 [SimplifyCFG] Discard speculated dbg intrinsics
Summary:
SpeculativelyExecuteBB can flatten the CFG by doing
speculative execution followed by a select instruction.
When the speculatively executed BB contained dbg intrinsics
the result could be a little bit weird, since those dbg
intrinsics were inserted before the select in the flattened
CFG. So when single stepping in the debugger, printing the
value of the variable referenced in the dbg intrinsic, it
could happen that it looked like the variable had values
that never actually were assigned to the variable.

This patch simply discards all dbg intrinsics that were found
in the speculatively executed BB.

Reviewers: aprantl, chandlerc, craig.topper

Reviewed By: aprantl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39494

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317198 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-02 11:55:14 +00:00