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fpc_cpuinit: add destroyed register lists to assembler blocks

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Otherwise the compiler assumes no registers are overwritten. And while the
regular code generator won't use register variables if assembler blocks are
present, LLVM is not restricted like that (and it could still cause issues
even with the default code generator in case PIC-rebased addresses are
accessed).
This commit is contained in:
Jonas Maebe 2025-03-23 20:51:14 +01:00
parent 0785652b55
commit 91667644f4
1 changed files with 3 additions and 3 deletions
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6
rtl/x86_64/x86_64.inc
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@ -1636,7 +1636,7 @@ procedure fpc_cpuinit;
xorl %ecx,%ecx
cpuid
movl %ecx,cpuid1_ecx
end;
end ['eax', 'ebx', 'ecx', 'edx'];
has_sse41_support:=boolean(cpuid1_ecx shr 19 and 1);
if _eax>=7 then
begin
@ -1645,7 +1645,7 @@ procedure fpc_cpuinit;
xorl %ecx,%ecx
cpuid
movl %ebx,cpuid7_ebx
end;
end ['eax', 'ebx', 'ecx', 'edx'];
{$ifdef use_fast_repmovstos}
fast_large_repmovstosb:=cpuid7_ebx and (1 shl 9)<>0;
{$endif}
@ -1656,7 +1656,7 @@ procedure fpc_cpuinit;
xorl %ecx,%ecx
.byte 0x0f,0x01,0xd0 { xgetbv }
movl %eax,_eax
end;
end ['eax', 'rcx', 'edx'];
if (_eax and 6)=6 then
begin
has_avx_support:=(cpuid1_ecx and $10000000)<>0;