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cmd/compile: use FMA on plan9, and drop UseFMA 

Every OS uses FMA now.

Change-Id: Ia7ffa77c52c45aefca611ddc54e9dfffb27a48da
Reviewed-on: https://go-review.googlesource.com/c/go/+/655877
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Russ Cox 2025-03-04 23:45:38 -05:00 committed by Gopher Robot
parent 35cb497d6e
commit c9b07e8871
3 changed files with 0 additions and 21 deletions
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9
src/cmd/compile/internal/ssa/config.go
View File

@ -11,7 +11,6 @@ import (
"cmd/compile/internal/types"
"cmd/internal/obj"
"cmd/internal/src"
"internal/buildcfg"
)
// A Config holds readonly compilation information.
@ -48,7 +47,6 @@ type Config struct {
SoftFloat bool //
Race bool // race detector enabled
BigEndian bool //
UseFMA bool // Use hardware FMA operation
unalignedOK bool // Unaligned loads/stores are ok
haveBswap64 bool // architecture implements Bswap64
haveBswap32 bool // architecture implements Bswap32
@ -354,7 +352,6 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize, softfloat boo
}
c.ctxt = ctxt
c.optimize = optimize
c.UseFMA = true
c.SoftFloat = softfloat
if softfloat {
c.floatParamRegs = nil // no FP registers in softfloat mode
@ -363,12 +360,6 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize, softfloat boo
c.ABI0 = abi.NewABIConfig(0, 0, ctxt.Arch.FixedFrameSize, 0)
c.ABI1 = abi.NewABIConfig(len(c.intParamRegs), len(c.floatParamRegs), ctxt.Arch.FixedFrameSize, 1)
// On Plan 9, floating point operations are not allowed in note handler.
if buildcfg.GOOS == "plan9" {
// Don't use FMA on Plan 9
c.UseFMA = false
}
if ctxt.Flag_shared {
// LoweredWB is secretly a CALL and CALLs on 386 in
// shared mode get rewritten by obj6.go to go through

3
src/cmd/compile/internal/ssa/func.go
View File

@ -832,9 +832,6 @@ func (f *Func) spSb() (sp, sb *Value) {
// useFMA allows targeted debugging w/ GOFMAHASH
// If you have an architecture-dependent FP glitch, this will help you find it.
func (f *Func) useFMA(v *Value) bool {
if !f.Config.UseFMA {
return false
}
if base.FmaHash == nil {
return true
}

9
src/cmd/compile/internal/ssagen/intrinsics.go
View File

@ -767,11 +767,6 @@ func initIntrinsics(cfg *intrinsicBuildConfig) {
sys.ARM64, sys.Loong64, sys.PPC64, sys.RISCV64, sys.S390X)
addF("math", "FMA",
func(s *state, n *ir.CallExpr, args []*ssa.Value) *ssa.Value {
if !s.config.UseFMA {
s.vars[n] = s.callResult(n, callNormal) // types.Types[TFLOAT64]
return s.variable(n, types.Types[types.TFLOAT64])
}
if cfg.goamd64 >= 3 {
return s.newValue3(ssa.OpFMA, types.Types[types.TFLOAT64], args[0], args[1], args[2])
}
@ -804,10 +799,6 @@ func initIntrinsics(cfg *intrinsicBuildConfig) {
sys.AMD64)
addF("math", "FMA",
func(s *state, n *ir.CallExpr, args []*ssa.Value) *ssa.Value {
if !s.config.UseFMA {
s.vars[n] = s.callResult(n, callNormal) // types.Types[TFLOAT64]
return s.variable(n, types.Types[types.TFLOAT64])
}
addr := s.entryNewValue1A(ssa.OpAddr, types.Types[types.TBOOL].PtrTo(), ir.Syms.ARMHasVFPv4, s.sb)
v := s.load(types.Types[types.TBOOL], addr)
b := s.endBlock()