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Previously, softfloat mode does not work with register ABI, mainly because the compiler doesn't know how to pass floating point arguments and results. According to the ABI it should be passed in FP registers, but there isn't any in softfloat mode. This CL makes it work. When softfloat is used, we define the ABI as having 0 floating point registers (because there aren't any). The integer registers are unchanged. So floating point arguments and results are passed in memory. Another option is to pass (the bit representation of) floating point values in integer registers. But this complicates things because it'd need to reorder integer argument registers. Change-Id: Ibecbeccb658c10a868fa7f2dcf75138f719cc809 Reviewed-on: https://go-review.googlesource.com/c/go/+/327274 Trust: Cherry Mui <cherryyz@google.com> Run-TryBot: Cherry Mui <cherryyz@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
32 lines
622 B
Go
32 lines
622 B
Go
// run -gcflags=-d=softfloat
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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)
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// When using soft-float, OMUL might be rewritten to function
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// call so we should ensure it was evaluated first. Stack frame
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// setup for "test" function call should happen after call to runtime.fmul32
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var x int32 = 1
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func main() {
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var y float32 = 1.0
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test(x, y*y)
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}
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//go:noinline
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func test(id int32, a float32) {
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if id != x {
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fmt.Printf("got: %d, want: %d\n", id, x)
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panic("FAIL")
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}
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}
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