From e1b4ff1068e2e988dcc11101ae3fd471d332defb Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Wed, 10 Apr 2019 15:05:56 -0400
Subject: [PATCH] simd_scalar_shift_by_immediate: Migrate SQSHL implementation
to file-scope function
This will allow it to be reused for the implementation of UQSHL.
---
.../impl/simd_scalar_shift_by_immediate.cpp | 30 +++++++++++--------
1 file changed, 17 insertions(+), 13 deletions(-)
diff --git a/src/frontend/A64/translate/impl/simd_scalar_shift_by_immediate.cpp b/src/frontend/A64/translate/impl/simd_scalar_shift_by_immediate.cpp
index 57a3d146..1135ad88 100644
--- a/src/frontend/A64/translate/impl/simd_scalar_shift_by_immediate.cpp
+++ b/src/frontend/A64/translate/impl/simd_scalar_shift_by_immediate.cpp
@@ -30,6 +30,22 @@ enum class FloatConversionDirection {
FloatToFixed,
};
+bool SaturatingShiftLeft(TranslatorVisitor& v, Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) {
+ if (immh == 0b0000) {
+ return v.UnallocatedEncoding();
+ }
+
+ const size_t esize = 8U << Common::HighestSetBit(immh.ZeroExtend());
+ const size_t shift_amount = concatenate(immh, immb).ZeroExtend() - esize;
+
+ const IR::U128 operand = v.ir.ZeroExtendToQuad(v.V_scalar(esize, Vn));
+ const IR::U128 shift = v.ir.ZeroExtendToQuad(v.I(esize, shift_amount));
+ const IR::U128 result = v.ir.VectorSignedSaturatedShiftLeft(esize, operand, shift);
+
+ v.ir.SetQ(Vd, result);
+ return true;
+}
+
bool ShiftRight(TranslatorVisitor& v, Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd,
ShiftExtraBehavior behavior, Signedness signedness) {
if (!immh.Bit<3>()) {
@@ -254,19 +270,7 @@ bool TranslatorVisitor::SRI_1(Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) {
}
bool TranslatorVisitor::SQSHL_imm_1(Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) {
- if (immh == 0b0000) {
- return UnallocatedEncoding();
- }
-
- const size_t esize = 8U << Common::HighestSetBit(immh.ZeroExtend());
- const size_t shift_amount = concatenate(immh, immb).ZeroExtend() - esize;
-
- const IR::U128 operand = ir.ZeroExtendToQuad(V_scalar(esize, Vn));
- const IR::U128 shift = ir.ZeroExtendToQuad(I(esize, shift_amount));
- const IR::U128 result = ir.VectorSignedSaturatedShiftLeft(esize, operand, shift);
-
- ir.SetQ(Vd, result);
- return true;
+ return SaturatingShiftLeft(*this, immh, immb, Vn, Vd);
}
bool TranslatorVisitor::SQSHRN_1(Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) {