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Tailcall optimization and register preservation produces miscompile #97758

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gerben-stavenga opened this issue Jul 4, 2024 · 2 comments · May be fixed by #112098
Open

Tailcall optimization and register preservation produces miscompile #97758

gerben-stavenga opened this issue Jul 4, 2024 · 2 comments · May be fixed by #112098
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@antoniofrighetto
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backend:X86 llvm:optimizations miscompilation

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@gerben-stavenga
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Tailcall optimization moves call out of the push/pop scope to preserve registers

https://godbolt.org/z/1zdnK96z6
@antoniofrighetto antoniofrighetto self-assigned this Jul 5, 2024
@llvmbot
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llvmbot commented Jul 5, 2024

@llvm/issue-subscribers-backend-x86

Author: None (gerben-stavenga)

Tailcall optimization moves call out of the push/pop scope to preserve registers

https://godbolt.org/z/1zdnK96z6

@gerben-stavenga
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Btw. It's not only that it moves the call out of push/pop scope. It also doesn't set up the registers properly it misses the 3rd argument in rdx

antoniofrighetto added a commit to antoniofrighetto/llvm-project that referenced this issue Oct 12, 2024
@antoniofrighetto
[X86] Do not elect to tail call if caller must preserve all registers
ec6b311 
A miscompilation issue has been addressed with improved checking.

Fixes: llvm#97758.
@antoniofrighetto antoniofrighetto linked a pull request Oct 12, 2024 that will close this issue
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antoniofrighetto added a commit to antoniofrighetto/llvm-project that referenced this issue Oct 12, 2024
@antoniofrighetto
[X86] Do not elect to tail call if caller must preserve all registers
0c9ca09 
A miscompilation issue has been addressed with improved checking.

Fixes: llvm#97758.
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[X86] Do not elect to tail call if caller must preserve all registers antoniofrighetto/llvm-project
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@EugeneZelenko @antoniofrighetto @gerben-stavenga @llvmbot