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Adhemerval Zanella dad55c2218 [ARM] [ELF] Fix ARMMaterializeGV for Indirect calls 
Recent shouldAssumeDSOLocal changes (introduced by 961f31d8ad)
do not take in consideration the relocation model anymore.  The ARM
fast-isel pass uses the function return to set whether a global symbol
is loaded indirectly or not, and without the expected information
llvm now generates an extra load for following code:

```
$ cat test.ll
@__asan_option_detect_stack_use_after_return = external global i32
define dso_local i32 @main(i32 %argc, i8** %argv) #0 {
entry:
  %0 = load i32, i32* @__asan_option_detect_stack_use_after_return,
align 4
  %1 = icmp ne i32 %0, 0
  br i1 %1, label %2, label %3

2:
  ret i32 0

3:
  ret i32 1
}

attributes #0 = { noinline optnone }

$ lcc test.ll -o -
[...]
main:
        .fnstart
[...]
        movw    r0, :lower16:__asan_option_detect_stack_use_after_return
        movt    r0, :upper16:__asan_option_detect_stack_use_after_return
        ldr     r0, [r0]
        ldr     r0, [r0]
        cmp     r0, #0
[...]
```

And without 'optnone' it produces:
```
[...]
main:
        .fnstart
[...]
        movw    r0, :lower16:__asan_option_detect_stack_use_after_return
        movt    r0, :upper16:__asan_option_detect_stack_use_after_return
        ldr     r0, [r0]
        clz     r0, r0
        lsr     r0, r0, #5
        bx      lr

[...]
```

This triggered a lot of invalid memory access in sanitizers for
arm-linux-gnueabihf.  I checked this patch both a stage1 built with
gcc and a stage2 bootstrap and it fixes all the Linux sanitizers
issues.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D95379
 		2021-01-26 15:57:55 -03:00
..
benchmarks
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bindings
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cmake Reland [lldb][docs] Use sphinx instead of epydoc to generate LLDB's Python reference 2021-01-17 12:13:01 +01:00
docs [Doc][NFC] Fix Kaleidoscope links, typos and add blog posts for MCJIT 2021-01-25 19:59:36 +05:30
examples [Doc][NFC] Fix Kaleidoscope links, typos and add blog posts for MCJIT 2021-01-25 19:59:36 +05:30
include [AMDGPU] HSAMD::fromString - replace std::string arg with StringRef. NFCI. 2021-01-26 16:09:39 +00:00
lib [ARM] [ELF] Fix ARMMaterializeGV for Indirect calls 2021-01-26 15:57:55 -03:00
projects
…
resources
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runtimes [CMake] Split the target side of runtimes build 2021-01-11 23:39:36 -08:00
test [ARM] [ELF] Fix ARMMaterializeGV for Indirect calls 2021-01-26 15:57:55 -03:00
tools [llvm-nm] Silence a gcc warning about a stray semicolon. NFC. 2021-01-26 12:29:14 +02:00
unittests [clang][cli] Accept strings instead of options in ImpliedByAnyOf 2021-01-26 09:30:36 +01:00
utils Reland "[lit] Use os.cpu_count() to cleanup TODO" 2021-01-26 10:19:26 -08:00
.clang-format
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.clang-tidy
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.gitattributes
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.gitignore
…
CMakeLists.txt [CMake] Remove dead code setting policies to NEW 2021-01-19 17:19:36 +02:00
CODE_OWNERS.TXT Change XCore code owner. 2021-01-14 12:13:48 +00:00
CREDITS.TXT
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LICENSE.TXT
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README.txt
…
RELEASE_TESTERS.TXT
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configure
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llvm.spec.in
…

README.txt 

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

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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If you are writing a package for LLVM, see docs/Packaging.rst for our
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