[fpc-pascal] Broken code with PEEPHOLE & REGVAR

Peter peter at pblackman.plus.com
Fri Mar 11 13:47:30 CET 2022


I had a look at the assembler generated by 3.3.1

.....

# Var uix located in stack [rsp+83240]
     movl    %edx,%eax
     movq    %rax,83280(%rsp)
# Var AttackLoc *located in stack [rsp+83280]*
# [503] var

.....

# [587] TestLoc := AttackLoc;
*movl    83280(%rsp),%r14d*                 # <<--------------********
# Var AttackLoc *located in register r14d*
     movl    %r14d,24(%rsp)
.....


AttackLoc location is changed to a register as before, but here it is actually moved with a movl.
It seems the bug is caused by the absence of this movl instruction.


Cheers,
Peter



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