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Couldn't allocate output reg for contraint 'r' (AMD64) #1401

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llvmbot opened this issue Dec 1, 2006 · 3 comments
Closed

Couldn't allocate output reg for contraint 'r' (AMD64) #1401

llvmbot opened this issue Dec 1, 2006 · 3 comments
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backend:X86 bugzilla Issues migrated from bugzilla compile-fail Use [accepts-invalid] and [rejects-valid] instead

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@llvmbot
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llvmbot commented Dec 1, 2006

Bugzilla Link 1029
Resolution FIXED
Resolved on Feb 22, 2010 12:54
Version 1.9
OS Linux
Attachments test.ll
Reporter LLVM Bugzilla Contributor

Extended Description

the code

void
frame_dummy (void)
{

    void (*register_classes) (void *) = 0;
  __asm ("" : "+r" (register_classes));

}

produces the following error:

Couldn't allocate output reg for contraint 'r'!
@llvmbot
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llvmbot commented Dec 4, 2006

setting a breakpoint in SelectionDAGLowering::GetRegistersForValue shows that
ConstrCode is "r". The code seems to expect that a constraint is braced
with "{}"....

@llvmbot
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llvmbot commented Dec 4, 2006

add the 64bit registers for the "r" constraint

@lattner
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lattner commented Dec 5, 2006

Patch applied, thanks Rafael!

Patch here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20061204/040773.html

Testcase here: Regression/CodeGen/X86/x86-64-asm.ll

-Chris

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
clementval added a commit to clementval/llvm-project that referenced this issue Jan 26, 2022
@clementval
[flang] Add translateNameToFrontendMangledName fct (llvm#1401)
33660bd
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backend:X86 bugzilla Issues migrated from bugzilla compile-fail Use [accepts-invalid] and [rejects-valid] instead
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