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qemu/int128: Add int128_lshift

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Add left-shift to match the existing right-shift.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200815013145.539409-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2020-08-28 10:02:47 +01:00 • committed by Peter Maydell
parent 512c65e62e
commit 5be4dd043f
1 changed files with 16 additions and 0 deletions
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16
include/qemu/int128.h
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@ -63,6 +63,11 @@ static inline Int128 int128_rshift(Int128 a, int n)
return a >> n; return a >> n;
} }
static inline Int128 int128_lshift(Int128 a, int n)
{
return a << n;
}
static inline Int128 int128_add(Int128 a, Int128 b) static inline Int128 int128_add(Int128 a, Int128 b)
{ {
return a + b; return a + b;
@ -217,6 +222,17 @@ static inline Int128 int128_rshift(Int128 a, int n)
} }
} }
static inline Int128 int128_lshift(Int128 a, int n)
{
uint64_t l = a.lo << (n & 63);
if (n >= 64) {
return int128_make128(0, l);
} else if (n > 0) {
return int128_make128(l, (a.hi << n) | (a.lo >> (64 - n)));
}
return a;
}
static inline Int128 int128_add(Int128 a, Int128 b) static inline Int128 int128_add(Int128 a, Int128 b)
{ {
uint64_t lo = a.lo + b.lo; uint64_t lo = a.lo + b.lo;