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[kernel] Fix #DF when building with -O3

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I had failed to specify in inline asm that an input variable was the
same as the output variable.
This commit is contained in:
Justin C. Miller
2021-02-17 00:22:22 -08:00
parent f0025dbc47
commit b6772ac2ea
1 changed files with 1 additions and 1 deletions
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src/kernel/frame_allocator.cpp
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@@ -25,7 +25,7 @@ frame_allocator::frame_allocator(kernel::args::frame_block *frames, size_t count
inline unsigned inline unsigned
bsf(uint64_t v) bsf(uint64_t v)
{ {
asm ("tzcntq %q0, %q1" : "=r"(v) : "r"(v) : "cc"); asm ("tzcntq %q0, %q1" : "=r"(v) : "0"(v) : "cc");
return v; return v;
} }