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libFLAC: Fix cpuid detecton on old Cyrix CPUs

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Some old CPUs (eg Cyrix) set EDX but not ECX when executing CPUID.
One of the solutions is to clear ECX before calling cpuid. From
https://bugzilla.mozilla.org/show_bug.cgi?id=1096651#c9 bug

Patch-from: lvqcl <lvqcl.mail@gmail.com>
This commit is contained in:
Erik de Castro Lopo
2016-07-13 19:45:53 +10:00
parent 74e751c421
commit c12bfa0e72
1 changed files with 1 additions and 0 deletions
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1
src/libFLAC/ia32/cpu_asm.nasm
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@@ -78,6 +78,7 @@ cident FLAC__cpu_info_asm_ia32
cpuid
cmp eax, 1
jb .no_cpuid
xor ecx, ecx
mov eax, 1
cpuid
mov ebx, [esp + 8]