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UserspaceEmulator: Split SAR inline assembly into 8/16/32 bit variants

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This commit is contained in:
Andreas Kling 2020-07-11 13:43:27 +02:00
parent 743d4ccb8f
commit 133803b8a7
1 changed files with 13 additions and 4 deletions
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17
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -702,12 +702,21 @@ T SoftCPU::sar_impl(T data, u8 steps)
u32 result = 0; u32 result = 0;
u32 new_flags = 0; u32 new_flags = 0;
asm("sarl %%cl, %%eax\n"
if constexpr (sizeof(T) == 4)
asm volatile("sarl %%cl, %%eax\n" ::"a"(data), "c"(steps));
else if constexpr (sizeof(T) == 2)
asm volatile("sarw %%cl, %%ax\n" ::"a"(data), "c"(steps));
else if constexpr (sizeof(T) == 1)
asm volatile("sarb %%cl, %%al\n" ::"a"(data), "c"(steps));
asm volatile(
"mov %%eax, %%ebx\n" "mov %%eax, %%ebx\n"
: "=b"(result));
asm volatile(
"pushf\n" "pushf\n"
"pop %%eax\n" "pop %%eax"
: "=a"(new_flags), "=b"(result) : "=a"(new_flags));
: "a"(data), "c"(steps));
set_flags_oszapc(new_flags); set_flags_oszapc(new_flags);
return result; return result;