commit c61b3c984c509d5f7c8eb71b853c81a34b5c28ef
author Matteo Franchin <matteo.franchin@arm.com> Wed Jun 18 11:52:47 2014 +0100
committer Matteo Franchin <matteo.franchin@arm.com> Thu Jun 19 18:35:29 2014 +0100
tree 792c345f05a772f930dcc841dd4e1e266c0cc091
parent 49e5ec42595b29e233fb92b8bd2cf8ade77c6501

AArch64: implement easy division and reminder.

This implements easy division and reminder for integer only (32-bit).
The optimisation applies to div/rem by powers of 2 and to div by small
literals (between 3-15).

Change-Id: I71be7c4de5d2e2e738b88984f13efb08f4388a19

compiler/dex/quick/arm64/assemble_arm64.cc

diff --git a/compiler/dex/quick/arm64/assemble_arm64.cc b/compiler/dex/quick/arm64/assemble_arm64.cc
index 2a8da24..e017e5f 100644
--- a/compiler/dex/quick/arm64/assemble_arm64.cc
+++ b/compiler/dex/quick/arm64/assemble_arm64.cc
@@ -484,7 +484,7 @@
                  "sdiv", "!0r, !1r, !2r", kFixupNone),
     ENCODING_MAP(WIDE(kA64Smaddl4xwwx), NO_VARIANTS(0x9b200000),
                  kFmtRegX, 4, 0, kFmtRegW, 9, 5, kFmtRegW, 20, 16,
-                 kFmtRegX, -1, -1, IS_QUAD_OP | REG_DEF0_USE123,
+                 kFmtRegX, 14, 10, IS_QUAD_OP | REG_DEF0_USE123,
                  "smaddl", "!0x, !1w, !2w, !3x", kFixupNone),
     ENCODING_MAP(WIDE(kA64Stp4ffXD), CUSTOM_VARIANTS(0x2d000000, 0x6d000000),
                  kFmtRegF, 4, 0, kFmtRegF, 14, 10, kFmtRegXOrSp, 9, 5,