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Heejin Ahn ac4006b0d6 [InstCombine] Don't slice up PHIs when pred BB has catchswitch 
If an integer PHI has an illegal type (according to the data layout) and
it is only used by `trunc` or `trunc(lshr)` operations, we split the PHI
into various instructions in its predecessors:
6d1543a167/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp (L1536-L1543)

So this can produce code like the following:
Before:
```
pred:
  ...

bb:
  %p = phi i8 [ %somevalue, %pred ], ...
  ...
  %tobool = trunc i8 %p to i1
  use %tobool
  ...
```
In this code, `%p` has an illegal integer type, `i8`, and its only used
in a `trunc` instruction later. In this case this pass puts extraction
code in its predecessors:

After:
```
pred:
  ...
  %t = and i8 %somevalue, 1
  %extract = icmp ne i8 %t, 0

bb:
  %p.new = phi i1 [ %extract, %pred ], ...
  use %p.new instead of %tobool
```

But this doesn't work if `pred` is a `catchswitch` BB because it cannot
have any non-PHI instructions. This CL ensures we bail out in that case.

Fixes https://github.com/llvm/llvm-project/issues/55803.

Reviewed By: dschuff

Differential Revision: https://reviews.llvm.org/D127699
 		2022-06-13 18:32:09 -07:00
..
benchmarks
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bindings [llvm-ocaml] Add and use opaque pointer compatible bindings 2022-06-02 11:42:24 +02:00
cmake Revert "[cmake] Don't export `LLVM_TOOLS_INSTALL_DIR` anymore" 2022-06-10 19:26:12 +00:00
docs Revert "[X86][RFC] Enable `_Float16` type support on X86 following the psABI" 2022-06-12 15:14:37 +00:00
examples Remove unneeded cl::ZeroOrMore for cl::opt/cl::list options 2022-06-05 01:07:51 -07:00
include [BasicTTI] Remove unused support for multiple opcodes in getTypeBasedIntrinsicInstrCost [nfc] 2022-06-13 18:23:39 -07:00
lib [InstCombine] Don't slice up PHIs when pred BB has catchswitch 2022-06-13 18:32:09 -07:00
projects
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resources
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runtimes Revert "[runtimes] Detect changes to Tests.cmake" 2022-05-26 09:34:18 -07:00
test [InstCombine] Don't slice up PHIs when pred BB has catchswitch 2022-06-13 18:32:09 -07:00
tools [ORC][ORC_RT] Integrate ORC platforms with LLJIT and lli 2022-06-09 22:47:58 -07:00
unittests [C-API][ORC] Add C API to suspend lookups during definition generation. 2022-06-13 17:20:07 -07:00
utils Revert "gn build: Add support for building the standalone ubsan runtime." 2022-06-13 14:06:14 -07:00
.clang-format
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.clang-tidy
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.gitattributes
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.gitignore
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CMakeLists.txt [CMake] Enable LLVM_ENABLE_PER_TARGET_RUNTIME_DIR by default on Linux 2022-06-07 21:22:38 -07:00
CODE_OWNERS.TXT
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CREDITS.TXT
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LICENSE.TXT
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README.txt
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RELEASE_TESTERS.TXT
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configure
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llvm.spec.in
…

README.txt 

The LLVM Compiler Infrastructure
================================

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