diff options
Diffstat (limited to 'src/internal/abi/abi_generic.go')
| -rw-r--r-- | src/internal/abi/abi_generic.go | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/internal/abi/abi_generic.go b/src/internal/abi/abi_generic.go new file mode 100644 index 0000000000..5ef9883dc6 --- /dev/null +++ b/src/internal/abi/abi_generic.go @@ -0,0 +1,38 @@ +// 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 ( + // 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 +) |