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cmd/internal/obj/riscv: correctly split immediates for FLW/FLD/FSW/FSD

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The FLW/FLD/FSW/FSD instructions can have immediates that exceed 12-bits and
therefore cannot be encoded in the RISCV instruction. Handle these as we do
for other load/store instructions. Also add test coverage for all load/store
instructions with large immediates.

Fixes compilation issue reported by Carlos Eduardo de Paula.

Updates #27532

Change-Id: Ifa62f19493b3acaba5a90ac31d2df209a3afea81
Reviewed-on: https://go-review.googlesource.com/c/go/+/215037
Reviewed-by: Carlos Eduardo de Paula <me@carlosedp.com>
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 2020-01-17 02:51:40 +11:00
parent 88ed322afc
commit 1424889921
2 changed files with 58 additions and 7 deletions
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54
src/cmd/internal/obj/riscv/asm_test.go
View file

@ -77,3 +77,57 @@ func TestNoRet(t *testing.T) {
t.Errorf("%v\n%s", err, out)
}
}
func TestImmediateSplitting(t *testing.T) {
dir, err := ioutil.TempDir("", "testimmsplit")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
tmpfile := filepath.Join(dir, "x.s")
asm := `
TEXT _stub(SB),$0-0
LB 4096(X5), X6
LH 4096(X5), X6
LW 4096(X5), X6
LD 4096(X5), X6
LBU 4096(X5), X6
LHU 4096(X5), X6
LWU 4096(X5), X6
SB X6, 4096(X5)
SH X6, 4096(X5)
SW X6, 4096(X5)
SD X6, 4096(X5)
FLW 4096(X5), F6
FLD 4096(X5), F6
FSW F6, 4096(X5)
FSD F6, 4096(X5)
MOVB 4096(X5), X6
MOVH 4096(X5), X6
MOVW 4096(X5), X6
MOV 4096(X5), X6
MOVBU 4096(X5), X6
MOVHU 4096(X5), X6
MOVWU 4096(X5), X6
MOVB X6, 4096(X5)
MOVH X6, 4096(X5)
MOVW X6, 4096(X5)
MOV X6, 4096(X5)
MOVF 4096(X5), F6
MOVD 4096(X5), F6
MOVF F6, 4096(X5)
MOVD F6, 4096(X5)
`
if err := ioutil.WriteFile(tmpfile, []byte(asm), 0644); err != nil {
t.Fatal(err)
}
cmd := exec.Command(testenv.GoToolPath(t), "tool", "asm", "-o", filepath.Join(dir, "x.o"), tmpfile)
cmd.Env = append(os.Environ(), "GOARCH=riscv64", "GOOS=linux")
if out, err := cmd.CombinedOutput(); err != nil {
t.Errorf("%v\n%s", err, out)
}
}

11
src/cmd/internal/obj/riscv/obj.go
View file

@ -716,11 +716,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
// <load> $imm, REG, TO (load $imm+(REG), TO)
// <store> $imm, REG, TO (store $imm+(TO), REG)
case ALD, ALB, ALH, ALW, ALBU, ALHU, ALWU,
ASD, ASB, ASH, ASW:
// LUI $high, TMP
// ADDI $low, TMP, TMP
q := *p
case ALB, ALH, ALW, ALD, ALBU, ALHU, ALWU, AFLW, AFLD, ASB, ASH, ASW, ASD, AFSW, AFSD:
low, high, err := Split32BitImmediate(p.From.Offset)
if err != nil {
ctxt.Diag("%v: constant %d too large", p, p.From.Offset)
@ -729,8 +725,9 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
break // no need to split
}
q := *p
switch q.As {
case ALD, ALB, ALH, ALW, ALBU, ALHU, ALWU:
case ALB, ALH, ALW, ALD, ALBU, ALHU, ALWU, AFLW, AFLD:
// LUI $high, TMP
// ADD TMP, REG, TMP
// <load> $low, TMP, TO
@ -752,7 +749,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
p.From = obj.Addr{Type: obj.TYPE_CONST, Offset: low}
p.Reg = REG_TMP
case ASD, ASB, ASH, ASW:
case ASB, ASH, ASW, ASD, AFSW, AFSD:
// LUI $high, TMP
// ADD TMP, TO, TMP
// <store> $low, REG, TMP