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Author SHA1 Message Date
Daniel Frampton 494abe139a [AArch64] Change AArch64 Windows EH UnwindHelp object to be a fixed object 
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
 2020-03-31 14:21:21 -07:00
Eli Friedman 92d0d13366 [AArch64] Prefer "mov" over "orr" to materialize constants. 
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
 2019-03-25 21:25:28 +00:00
Eli Friedman d19a7060c6 [AArch64] [Windows] Don't skip constructing UnwindHelp. 
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
 2019-02-28 20:38:45 +00:00