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cmd/internal/obj/riscv: handle MOV rewrites in separate pass

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Handle the rewriting of MOV pseudo-instructions in a separate pass. This allows
AMOV to be more readily used by other code, including AGETCALLERPC and ARET
implementations.

Updates #27532

Change-Id: Iea794121210048ed23ed0fb8f3c5e3cd5354a311
Reviewed-on: https://go-review.googlesource.com/c/go/+/212758
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Joel Sing 2020-01-01 01:28:22 +11:00
parent 2ee2c6232c
commit 24902c5be6
1 changed files with 12 additions and 11 deletions
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23
src/cmd/internal/obj/riscv/obj.go
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@ -594,9 +594,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
// Additional instruction rewriting. Any rewrites that change the number
// of instructions must occur here (before jump target resolution).
for p := cursym.Func.Text; p != nil; p = p.Link {
if p.As == obj.AGETCALLERPC {
// Handle AGETCALLERPC early so we can use AMOV, which is then
// rewritten below.
switch p.As {
case obj.AGETCALLERPC:
if cursym.Leaf() {
// MOV LR, Rd
p.As = AMOV
@ -608,14 +607,6 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
p.From.Type = obj.TYPE_MEM
p.From.Reg = REG_SP
}
}
switch p.As {
case AMOV, AMOVB, AMOVH, AMOVW, AMOVBU, AMOVHU, AMOVWU, AMOVF, AMOVD:
// Rewrite MOV pseudo-instructions. This cannot be done in
// progedit, as SP offsets need to be applied before we split
// up some of the Addrs.
rewriteMOV(ctxt, newprog, p)
case obj.ACALL:
switch p.To.Type {
@ -666,6 +657,16 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
}
}
// Rewrite MOV pseudo-instructions. This cannot be done in
// progedit, as SP offsets need to be applied before we split
// up some of the Addrs.
for p := cursym.Func.Text; p != nil; p = p.Link {
switch p.As {
case AMOV, AMOVB, AMOVH, AMOVW, AMOVBU, AMOVHU, AMOVWU, AMOVF, AMOVD:
rewriteMOV(ctxt, newprog, p)
}
}
// Split immediates larger than 12-bits.
for p := cursym.Func.Text; p != nil; p = p.Link {
switch p.As {