Changeset 104301 in vbox for trunk/src

Timestamp:

Apr 11, 2024 9:14:39 PM (13 months ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

162777

Message:

VMM/IEM: Shortened down the 8-bit and 16-bit ROL ARM assembly a little. bugref:10376

File:

• trunk/src/VBox/VMM/VMMAll/IEMAllAImpl-arm64.S (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/IEMAllAImpl-arm64.S

@@ -723 +723 @@
 .ifne \a_cBits < 32
         and     w2, w2, #(\a_cBits - 1)
-        neg     w3, w2
-        and     w3, w3, #(\a_cBits - 1)
+        neg     w3, w2                          /* the count is MODed by the data size, so this is safe. */
         ldr\a_LdStSuff  w8, [x1]
-        lslv    w9, w8, w2
-        lsrv    w10, w8, w3
-        orr     w9, w9, w10
+        orr     w8, w8, w8, LSL #(32 - \a_cBits) /* place a copy of the value at the top of the register, ready to be roated in */
+        rorv    w9, w8, w2
         str\a_LdStSuff  w9, [x1]
-        and     w9, w9, #(RT_BIT_32(\a_cBits) - 1)
 .else
         neg     w3, w2                          /* the count is MODed by the data size, so this is safe. */