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x86 asm: move POPCNT in from x86-assembly-cheat

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Ciro Santilli 六四事件 法轮功
2019-06-16 00:00:06 +00:00
parent 76c7cfe5aa
commit 0d4ad3e7e2
2 changed files with 40 additions and 0 deletions
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37
userland/arch/x86_64/popcnt.S Normal file
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@@ -0,0 +1,37 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-bit-and-byte-instructions */
#include <lkmc.h>
LKMC_PROLOGUE
mov $0, %rbx
popcnt %rbx, %rax
LKMC_ASSERT_EQ(%rax, $0)
mov $1, %rbx
popcnt %rbx, %rax
LKMC_ASSERT_EQ(%rax, $1)
mov $2, %rbx
popcnt %rbx, %rax
LKMC_ASSERT_EQ(%rax, $1)
mov $3, %rbx
popcnt %rbx, %rax
LKMC_ASSERT_EQ(%rax, $2)
mov $4, %rbx
popcnt %rbx, %rax
LKMC_ASSERT_EQ(%rax, $1)
mov $5, %rbx
popcnt %rbx, %rax
LKMC_ASSERT_EQ(%rax, $2)
mov $6, %rbx
popcnt %rbx, %rax
LKMC_ASSERT_EQ(%rax, $2)
mov $7, %rbx
popcnt %rbx, %rax
LKMC_ASSERT_EQ(%rax, $3)
LKMC_EPILOGUE