diff mbox series

[01/20] qemu/int128: Add int128_lshift

Message ID 20200815013145.539409-2-richard.henderson@linaro.org
State Superseded
Headers show
Series target/arm: SVE2 preparatory patches | expand

Commit Message

Richard Henderson Aug. 15, 2020, 1:31 a.m. UTC 
Add left-shift to match the existing right-shift.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 include/qemu/int128.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

-- 
2.25.1

Comments

Peter Maydell Aug. 24, 2020, 4:40 p.m. UTC | #1 
On Sat, 15 Aug 2020 at 02:31, Richard Henderson
<richard.henderson@linaro.org> wrote:
>

> 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>


thanks
-- PMM
diff mbox series

Patch

diff --git a/include/qemu/int128.h b/include/qemu/int128.h
index 5c9890db8b..76ea405922 100644
--- a/include/qemu/int128.h
+++ b/include/qemu/int128.h
@@ -63,6 +63,11 @@  static inline Int128 int128_rshift(Int128 a, int 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)
 {
     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)
 {
     uint64_t lo = a.lo + b.lo;