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The UnwindHelp object is used during exception handling by runtime
code. It must be findable from a fixed offset from FP.
This change allocates the UnwindHelp object as a fixed object (as is
done for x86_64) to ensure that both the generated code and runtime
agree on the location of the object.
Fixes https://bugs.llvm.org/show_bug.cgi?id=45346
Differential Revision: https://reviews.llvm.org/D77016
(cherry picked from commit 494abe139a9aab991582f1b3f3370b99b252944c)
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This is generally more readable due to the way the assembler aliases
work.
(This causes a lot of test changes, but it's not really as scary as it
looks at first glance; it's just mechanically changing a bunch of checks
for orr to check for mov instead.)
Differential Revision: https://reviews.llvm.org/D59720
llvm-svn: 356954
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In certain cases, the first non-frame-setup instruction in a function is
a branch. For example, it could be a cbz on an argument. Make sure we
correctly allocate the UnwindHelp, and find an appropriate register to
use to initialize it.
Fixes https://bugs.llvm.org/show_bug.cgi?id=40184
Differential Revision: https://reviews.llvm.org/D58752
llvm-svn: 355136
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