On 12/03/2022 11:33, Florian Klämpfl via fpc-pascal wrote:
Am 12.03.2022 um 12:05 schrieb Peter via fpc-pascal
<fpc-pascal@lists.freepascal.org>:
Its looking like it was fixed in main somewhere between
31cd3df7 24 Jan, 2021
&
837b433a 28 Apr, 2021
Can you bisect it by any chance? See
https://wiki.freepascal.org/FPC_git#bisect.27ing
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Hi Florian,
The problem was fixed with commit 503fc85d
2021-04-06 florian * patch by J. Gareth Moreton: handle register allocations
correctly in MovMov2Mov 3, resolves #38703
https://gitlab.com/freepascal.org/fpc/source/-/issues/38703
Assembler for line 587 and surrounding comments from previous commit
# Peephole Optimization: MovMov2Mov 3 done
# Peephole Optimization: MovMovMov2MovMov 1 done
# [587] TestLoc := AttackLoc;
movl 83288(%rsp),%eax
# Var AttackLoc located in register r13d
movl %eax,24(%rsp)
# Peephole Optimization: MovxMov2Movx
From commit 503fc85d 2021-04-06
# Peephole Optimization: MovMov2Mov 3 done
# [587] TestLoc := AttackLoc;
movl 83288(%rsp),%r13d
# Var AttackLoc located in register r13d
# Peephole Optimization: MovMov2MovMov1 done
movl %r13d,24(%rsp)
In this example, although the compiler intends to use r13d for the parameter
AttackLoc from line 587 onwards,
it does not actually load that register, prior to fix for #38703
Cheers,
Peter
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