From 234a22803ddb28c02cb116ea1a92498d2c32f7d5 Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Fri, 26 Feb 2021 13:45:41 -0500
Subject: [PATCH] qemu/int128: Add int128_lshift

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

Backports 5be4dd043f5beb5e7587d1ef8dd4e3716ec05639
---
 qemu/include/qemu/int128.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/qemu/include/qemu/int128.h b/qemu/include/qemu/int128.h
index 159cb13f..8330cf76 100644
--- a/qemu/include/qemu/int128.h
+++ b/qemu/include/qemu/int128.h
@@ -70,6 +70,11 @@ static inline Int128 int128_add(Int128 a, Int128 b)
     return a + b;
 }
 
+static inline Int128 int128_lshift(Int128 a, int n)
+{
+    return a << n;
+}
+
 static inline Int128 int128_neg(Int128 a)
 {
     return -a;
@@ -226,6 +231,17 @@ 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;