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Carrot added a comment.
Thanks for the clarification, I will propose another patch for my purpose.
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I want to reserve most of the physical registers, so only a small number of
registers can be used by register allocator. Then I can write small test cases
to simulate high register pressure situation, it will be much easier to test
and debug register allocation changes.
Carrot added a comment.
A reserved physical register doesn't mean it can't be used by compiler/linker,
it just means it can't be used by register allocator, see the comments in
TargetRegisterInfo::getReservedRegs(). The most common example is the stack
pointer. So when we reserve X8, X16, X17 a
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Reserved phys
Carrot added a comment.
I'm trying to understand the problem in this pass.
It looks both of @thopre's and @lebedev.ri's problems are loop related. Is
there any other regression not loop related?
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Carrot added a comment.
Finally complain comes.
It slows down a hot path in tcmalloc. A simplified test case is at
https://godbolt.org/z/T6sshjf7M
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This revision was automatically updated to reflect the committed changes.
Closed by commit rL316179: [CGExprScalar] Add missing types in function
GetIntrinsic (authored by Carrot).
Changed prior to commit:
https://reviews.llvm.org/D38820?vs=118680&id=119613#toc
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ping
https://reviews.llvm.org/D38820
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In function GetIntrinsic, not all types are covered. Types double and long long
are missed, type long is wrongly treated same as int, it should be same as long
long. These problems cause compiler crashes when compiling code in PR31161.
This patch fixed the problem.
This revision was automatically updated to reflect the committed changes.
Closed by commit rL315358: [CGExprScalar] In EmitCompare trunc the result if it
has different type as E… (authored by Carrot).
Changed prior to commit:
https://reviews.llvm.org/D38656?vs=118236&id=118464#toc
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Carrot added a comment.
In https://reviews.llvm.org/D38656#892740, @nemanjai wrote:
> In https://reviews.llvm.org/D38656#892072, @Carrot wrote:
>
> > I worked on a similar bug as 31161, and then found this one, it should be
> > same as in comment7.
> > What is the current status of the work on
Carrot updated this revision to Diff 118236.
Carrot marked 3 inline comments as done.
https://reviews.llvm.org/D38656
Files:
lib/CodeGen/CGExprScalar.cpp
test/CodeGen/ppc-vector-compare.cc
Index: test/CodeGen/ppc-vector-compare.cc
Carrot added a comment.
I worked on a similar bug as 31161, and then found this one, it should be same
as in comment7.
What is the current status of the work on that bug?
https://reviews.llvm.org/D38656
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Usually compare expression should return i1 type, so EmitScalarConversion is
called before return
return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
E->getExprLoc());
But when ppc intrinsic is called t
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