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cmd/internal/obj/riscv: support MOVD with floating point constants

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Currently, we only support loading of values from memory (or other
registers). Add floating point constant support to MOVD. This is
implemented by storing the floating point constant to a symbol,
which is then loaded into the floating point register.

Change-Id: I6db242d27f606f0d5d084a3ab93538698d3a4f8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/631876
Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Joel Sing 2024-07-02 00:31:53 +10:00
parent 77343fa646
commit d7c242a19a
2 changed files with 22 additions and 3 deletions
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3
src/cmd/asm/internal/asm/testdata/riscv64.s vendored
View file

@ -510,6 +510,9 @@ start:
MOVD F0, 4(X5) // 27b20200
MOVD F0, F1 // d3000022
// Convert to load of symbol (AUIPC + FLD)
MOVD $(709.78271289338397), F3 // 970f000087b10f00
// TLS load with local-exec (LUI + ADDIW + ADD of TP + load)
MOV tls(SB), X5 // b70f00009b8f0f00b38f4f0083b20f00
MOVB tls(SB), X5 // b70f00009b8f0f00b38f4f0083820f00

22
src/cmd/internal/obj/riscv/obj.go
View file

@ -147,6 +147,15 @@ func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
p.From.Name = obj.NAME_EXTERN
p.From.Offset = 0
}
case AMOVD:
if p.From.Type == obj.TYPE_FCONST && p.From.Name == obj.NAME_NONE && p.From.Reg == obj.REG_NONE {
f64 := p.From.Val.(float64)
p.From.Type = obj.TYPE_MEM
p.From.Sym = ctxt.Float64Sym(f64)
p.From.Name = obj.NAME_EXTERN
p.From.Offset = 0
}
}
}
@ -2322,12 +2331,19 @@ func instructionsForMOV(p *obj.Prog) []*instruction {
}
// Note that the values for $off_hi and $off_lo are currently
// zero and will be assigned during relocation.
// zero and will be assigned during relocation. If the destination
// is an integer register then we can use the same register for the
// address computation, otherwise we need to use the temporary register.
//
// AUIPC $off_hi, Rd
// L $off_lo, Rd, Rd
insAUIPC := &instruction{as: AAUIPC, rd: ins.rd}
ins.as, ins.rs1, ins.rs2, ins.imm = movToLoad(p.As), ins.rd, obj.REG_NONE, 0
//
addrReg := ins.rd
if addrReg < REG_X0 || addrReg > REG_X31 {
addrReg = REG_TMP
}
insAUIPC := &instruction{as: AAUIPC, rd: addrReg}
ins.as, ins.rs1, ins.rs2, ins.imm = movToLoad(p.As), addrReg, obj.REG_NONE, 0
inss = []*instruction{insAUIPC, ins}
default: