From 205ca6b4cb95d62fa2b66637e9ce33a587566528 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Fri, 13 Apr 2018 20:39:25 -0400
Subject: [PATCH] A64: Implement SHA1SU1

---
 src/frontend/A64/decoder/a64.inc             |  2 +-
 src/frontend/A64/translate/impl/simd_sha.cpp | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc
index dc9404d7..aa7e4681 100644
--- a/src/frontend/A64/decoder/a64.inc
+++ b/src/frontend/A64/decoder/a64.inc
@@ -330,7 +330,7 @@ INST(SHA1SU0,                "SHA1SU0",                                   "01011
 //INST(SHA256H2,               "SHA256H2",                                  "01011110000mmmmm010100nnnnnddddd")
 //INST(SHA256SU1,              "SHA256SU1",                                 "01011110000mmmmm011000nnnnnddddd")
 INST(SHA1H,                  "SHA1H",                                     "0101111000101000000010nnnnnddddd")
-//INST(SHA1SU1,                "SHA1SU1",                                   "0101111000101000000110nnnnnddddd")
+INST(SHA1SU1,                "SHA1SU1",                                   "0101111000101000000110nnnnnddddd")
 //INST(SHA256SU0,              "SHA256SU0",                                 "0101111000101000001010nnnnnddddd")
 
 // Data Processing - FP and SIMD - Scalar copy
diff --git a/src/frontend/A64/translate/impl/simd_sha.cpp b/src/frontend/A64/translate/impl/simd_sha.cpp
index d9190ee8..a5df04db 100644
--- a/src/frontend/A64/translate/impl/simd_sha.cpp
+++ b/src/frontend/A64/translate/impl/simd_sha.cpp
@@ -28,6 +28,23 @@ bool TranslatorVisitor::SHA1SU0(Vec Vm, Vec Vn, Vec Vd) {
     return true;
 }
 
+bool TranslatorVisitor::SHA1SU1(Vec Vn, Vec Vd) {
+    const IR::U128 d = ir.GetQ(Vd);
+    const IR::U128 n = ir.GetQ(Vn);
+
+    // Shuffle down the whole vector and zero out the top 32 bits
+    const IR::U128 shuffled_n = ir.VectorSetElement(32, ir.VectorShuffleWords(n, 0b00111001), 3, ir.Imm32(0));
+    const IR::U128 t = ir.VectorEor(d, shuffled_n);
+    const IR::U128 rotated_t = ir.VectorRotateLeft(32, t, 1);
+
+    const IR::U32 low_rotated_t = ir.RotateRight(ir.VectorGetElement(32, rotated_t, 0), ir.Imm8(31));
+    const IR::U32 high_t = ir.VectorGetElement(32, rotated_t, 3);
+    const IR::U128 result = ir.VectorSetElement(32, rotated_t, 3, ir.Eor(low_rotated_t, high_t));
+
+    ir.SetQ(Vd, result);
+    return true;
+}
+
 bool TranslatorVisitor::SHA1H(Vec Vn, Vec Vd) {
     const IR::U128 data = ir.GetS(Vn);