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cmd/compile: remove ARMv5 special case in register allocator

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The register allocator has a special case that doesn't allocate
LR on ARMv5. This was necessary when softfloat expansion was done
by the assembler. Now softfloat calls are inserted by SSA, so it
works as normal. Remove this special case.

Change-Id: I5502f07597f4d4b675dc16b6b0d7cb47e1e8974b
Reviewed-on: https://go-review.googlesource.com/c/go/+/301792
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2021-03-12 18:45:52 -05:00
parent 8ac6544564
commit c4190fc34d
1 changed files with 0 additions and 6 deletions
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6
src/cmd/compile/internal/ssa/regalloc.go
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@ -605,12 +605,6 @@ func (s *regAllocState) init(f *Func) {
// Leaf functions don't save/restore the link register. // Leaf functions don't save/restore the link register.
s.allocatable &^= 1 << uint(s.f.Config.LinkReg) s.allocatable &^= 1 << uint(s.f.Config.LinkReg)
} }
if s.f.Config.arch == "arm" && objabi.GOARM == 5 {
// On ARMv5 we insert softfloat calls at each FP instruction.
// This clobbers LR almost everywhere. Disable allocating LR
// on ARMv5.
s.allocatable &^= 1 << uint(s.f.Config.LinkReg)
}
} }
if s.f.Config.ctxt.Flag_dynlink { if s.f.Config.ctxt.Flag_dynlink {
switch s.f.Config.arch { switch s.f.Config.arch {