| // 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. |
| |
| //go:build !goexperiment.regabireflect && !amd64 |
| // +build !goexperiment.regabireflect,!amd64 |
| |
| package abi |
| |
| const ( |
| // ABI-related constants. |
| // |
| // In the generic case, these are all zero |
| // which lets them gracefully degrade to ABI0. |
| |
| // IntArgRegs is the number of registers dedicated |
| // to passing integer argument values. Result registers are identical |
| // to argument registers, so this number is used for those too. |
| IntArgRegs = 0 |
| |
| // FloatArgRegs is the number of registers dedicated |
| // to passing floating-point argument values. Result registers are |
| // identical to argument registers, so this number is used for |
| // those too. |
| FloatArgRegs = 0 |
| |
| // EffectiveFloatRegSize describes the width of floating point |
| // registers on the current platform from the ABI's perspective. |
| // |
| // Since Go only supports 32-bit and 64-bit floating point primitives, |
| // this number should be either 0, 4, or 8. 0 indicates no floating |
| // point registers for the ABI or that floating point values will be |
| // passed via the softfloat ABI. |
| // |
| // For platforms that support larger floating point register widths, |
| // such as x87's 80-bit "registers" (not that we support x87 currently), |
| // use 8. |
| EffectiveFloatRegSize = 0 |
| ) |
