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-rw-r--r--src/internal/abi/abi_amd64.go20
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diff --git a/src/internal/abi/abi_amd64.go b/src/internal/abi/abi_amd64.go
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+++ b/src/internal/abi/abi_amd64.go
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+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build goexperiment.regabi
+
+package abi
+
+const (
+ // See abi_generic.go.
+
+ // RAX, RBX, RCX, RDI, RSI, R8, R9, R10, R11.
+ IntArgRegs = 9
+
+ // X0 -> X14.
+ FloatArgRegs = 15
+
+ // We use SSE2 registers which support 64-bit float operations.
+ EffectiveFloatRegSize = 8
+)