cmd/internal/obj: remove param element from ppc64 optab

This is rarely used, and is implied based on the
memory type of the operand.  This is a step towards
simplifying the MOV* pseudo opcodes on ppc64.

Similarly, remove the bogus param value from AVMULESB.

Change-Id: Ibad4d045ec6d8c5163a468b2db1dfb762ef674ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/300177
Run-TryBot: Paul Murphy <murp@ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Trust: Ian Lance Taylor <iant@golang.org>

diff --git a/src/cmd/internal/obj/ppc64/asm9.go b/src/cmd/internal/obj/ppc64/asm9.go
index 648a41b5c7aa3eb7b95ca8f7119c57f3eb38a4c6..e979cabddf42667314eeba54d7f0aaa803bdb0d6 100644 (file)
--- a/src/cmd/internal/obj/ppc64/asm9.go
+++ b/src/cmd/internal/obj/ppc64/asm9.go
@@ -72,7 +72,6 @@ type Optab struct {
        a6    uint8  // p.To (obj.Addr)
        type_ int8   // cases in asmout below. E.g., 44 = st r,(ra+rb); 45 = ld (ra+rb), r
        size  int8   // Text space in bytes to lay operation
-       param int16  // Implied base register for pseudo-registers
 }
 
 // optab contains an array to be sliced of accepted operand combinations for an
@@ -202,73 +201,73 @@ var optab = []Optab{
        {as: AFMUL, a1: C_FREG, a2: C_FREG, a6: C_FREG, type_: 32, size: 4},
 
        /* store, short offset */
-       {as: AMOVD, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVW, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVWZ, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVBZ, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVBZU, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVB, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVBU, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVD, a1: C_REG, a6: C_SEXT, type_: 7, size: 4, param: REGSB},
-       {as: AMOVW, a1: C_REG, a6: C_SEXT, type_: 7, size: 4, param: REGSB},
-       {as: AMOVWZ, a1: C_REG, a6: C_SEXT, type_: 7, size: 4, param: REGSB},
-       {as: AMOVBZ, a1: C_REG, a6: C_SEXT, type_: 7, size: 4, param: REGSB},
-       {as: AMOVB, a1: C_REG, a6: C_SEXT, type_: 7, size: 4, param: REGSB},
-       {as: AMOVD, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4, param: REGSP},
-       {as: AMOVW, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4, param: REGSP},
-       {as: AMOVWZ, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4, param: REGSP},
-       {as: AMOVBZ, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4, param: REGSP},
-       {as: AMOVB, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4, param: REGSP},
-       {as: AMOVD, a1: C_REG, a6: C_SOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVW, a1: C_REG, a6: C_SOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVWZ, a1: C_REG, a6: C_SOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVBZ, a1: C_REG, a6: C_SOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVBZU, a1: C_REG, a6: C_SOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVB, a1: C_REG, a6: C_SOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AMOVBU, a1: C_REG, a6: C_SOREG, type_: 7, size: 4, param: REGZERO},
+       {as: AMOVD, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4},
+       {as: AMOVW, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4},
+       {as: AMOVWZ, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4},
+       {as: AMOVBZ, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4},
+       {as: AMOVBZU, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4},
+       {as: AMOVB, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4},
+       {as: AMOVBU, a1: C_REG, a2: C_REG, a6: C_ZOREG, type_: 7, size: 4},
+       {as: AMOVD, a1: C_REG, a6: C_SEXT, type_: 7, size: 4},
+       {as: AMOVW, a1: C_REG, a6: C_SEXT, type_: 7, size: 4},
+       {as: AMOVWZ, a1: C_REG, a6: C_SEXT, type_: 7, size: 4},
+       {as: AMOVBZ, a1: C_REG, a6: C_SEXT, type_: 7, size: 4},
+       {as: AMOVB, a1: C_REG, a6: C_SEXT, type_: 7, size: 4},
+       {as: AMOVD, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4},
+       {as: AMOVW, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4},
+       {as: AMOVWZ, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4},
+       {as: AMOVBZ, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4},
+       {as: AMOVB, a1: C_REG, a6: C_SAUTO, type_: 7, size: 4},
+       {as: AMOVD, a1: C_REG, a6: C_SOREG, type_: 7, size: 4},
+       {as: AMOVW, a1: C_REG, a6: C_SOREG, type_: 7, size: 4},
+       {as: AMOVWZ, a1: C_REG, a6: C_SOREG, type_: 7, size: 4},
+       {as: AMOVBZ, a1: C_REG, a6: C_SOREG, type_: 7, size: 4},
+       {as: AMOVBZU, a1: C_REG, a6: C_SOREG, type_: 7, size: 4},
+       {as: AMOVB, a1: C_REG, a6: C_SOREG, type_: 7, size: 4},
+       {as: AMOVBU, a1: C_REG, a6: C_SOREG, type_: 7, size: 4},
 
        /* load, short offset */
-       {as: AMOVD, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVW, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVWZ, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVBZ, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVBZU, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVB, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 9, size: 8, param: REGZERO},
-       {as: AMOVBU, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 9, size: 8, param: REGZERO},
-       {as: AMOVD, a1: C_SEXT, a6: C_REG, type_: 8, size: 4, param: REGSB},
-       {as: AMOVW, a1: C_SEXT, a6: C_REG, type_: 8, size: 4, param: REGSB},
-       {as: AMOVWZ, a1: C_SEXT, a6: C_REG, type_: 8, size: 4, param: REGSB},
-       {as: AMOVBZ, a1: C_SEXT, a6: C_REG, type_: 8, size: 4, param: REGSB},
-       {as: AMOVB, a1: C_SEXT, a6: C_REG, type_: 9, size: 8, param: REGSB},
-       {as: AMOVD, a1: C_SAUTO, a6: C_REG, type_: 8, size: 4, param: REGSP},
-       {as: AMOVW, a1: C_SAUTO, a6: C_REG, type_: 8, size: 4, param: REGSP},
-       {as: AMOVWZ, a1: C_SAUTO, a6: C_REG, type_: 8, size: 4, param: REGSP},
-       {as: AMOVBZ, a1: C_SAUTO, a6: C_REG, type_: 8, size: 4, param: REGSP},
-       {as: AMOVB, a1: C_SAUTO, a6: C_REG, type_: 9, size: 8, param: REGSP},
-       {as: AMOVD, a1: C_SOREG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVW, a1: C_SOREG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVWZ, a1: C_SOREG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVBZ, a1: C_SOREG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVBZU, a1: C_SOREG, a6: C_REG, type_: 8, size: 4, param: REGZERO},
-       {as: AMOVB, a1: C_SOREG, a6: C_REG, type_: 9, size: 8, param: REGZERO},
-       {as: AMOVBU, a1: C_SOREG, a6: C_REG, type_: 9, size: 8, param: REGZERO},
+       {as: AMOVD, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVW, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVWZ, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVBZ, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVBZU, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVB, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 9, size: 8},
+       {as: AMOVBU, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 9, size: 8},
+       {as: AMOVD, a1: C_SEXT, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVW, a1: C_SEXT, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVWZ, a1: C_SEXT, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVBZ, a1: C_SEXT, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVB, a1: C_SEXT, a6: C_REG, type_: 9, size: 8},
+       {as: AMOVD, a1: C_SAUTO, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVW, a1: C_SAUTO, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVWZ, a1: C_SAUTO, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVBZ, a1: C_SAUTO, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVB, a1: C_SAUTO, a6: C_REG, type_: 9, size: 8},
+       {as: AMOVD, a1: C_SOREG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVW, a1: C_SOREG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVWZ, a1: C_SOREG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVBZ, a1: C_SOREG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVBZU, a1: C_SOREG, a6: C_REG, type_: 8, size: 4},
+       {as: AMOVB, a1: C_SOREG, a6: C_REG, type_: 9, size: 8},
+       {as: AMOVBU, a1: C_SOREG, a6: C_REG, type_: 9, size: 8},
 
        /* store, long offset */
-       {as: AMOVD, a1: C_REG, a6: C_LEXT, type_: 35, size: 8, param: REGSB},
-       {as: AMOVW, a1: C_REG, a6: C_LEXT, type_: 35, size: 8, param: REGSB},
-       {as: AMOVWZ, a1: C_REG, a6: C_LEXT, type_: 35, size: 8, param: REGSB},
-       {as: AMOVBZ, a1: C_REG, a6: C_LEXT, type_: 35, size: 8, param: REGSB},
-       {as: AMOVB, a1: C_REG, a6: C_LEXT, type_: 35, size: 8, param: REGSB},
-       {as: AMOVD, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8, param: REGSP},
-       {as: AMOVW, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8, param: REGSP},
-       {as: AMOVWZ, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8, param: REGSP},
-       {as: AMOVBZ, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8, param: REGSP},
-       {as: AMOVB, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8, param: REGSP},
-       {as: AMOVD, a1: C_REG, a6: C_LOREG, type_: 35, size: 8, param: REGZERO},
-       {as: AMOVW, a1: C_REG, a6: C_LOREG, type_: 35, size: 8, param: REGZERO},
-       {as: AMOVWZ, a1: C_REG, a6: C_LOREG, type_: 35, size: 8, param: REGZERO},
-       {as: AMOVBZ, a1: C_REG, a6: C_LOREG, type_: 35, size: 8, param: REGZERO},
-       {as: AMOVB, a1: C_REG, a6: C_LOREG, type_: 35, size: 8, param: REGZERO},
+       {as: AMOVD, a1: C_REG, a6: C_LEXT, type_: 35, size: 8},
+       {as: AMOVW, a1: C_REG, a6: C_LEXT, type_: 35, size: 8},
+       {as: AMOVWZ, a1: C_REG, a6: C_LEXT, type_: 35, size: 8},
+       {as: AMOVBZ, a1: C_REG, a6: C_LEXT, type_: 35, size: 8},
+       {as: AMOVB, a1: C_REG, a6: C_LEXT, type_: 35, size: 8},
+       {as: AMOVD, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8},
+       {as: AMOVW, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8},
+       {as: AMOVWZ, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8},
+       {as: AMOVBZ, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8},
+       {as: AMOVB, a1: C_REG, a6: C_LAUTO, type_: 35, size: 8},
+       {as: AMOVD, a1: C_REG, a6: C_LOREG, type_: 35, size: 8},
+       {as: AMOVW, a1: C_REG, a6: C_LOREG, type_: 35, size: 8},
+       {as: AMOVWZ, a1: C_REG, a6: C_LOREG, type_: 35, size: 8},
+       {as: AMOVBZ, a1: C_REG, a6: C_LOREG, type_: 35, size: 8},
+       {as: AMOVB, a1: C_REG, a6: C_LOREG, type_: 35, size: 8},
        {as: AMOVD, a1: C_REG, a6: C_ADDR, type_: 74, size: 8},
        {as: AMOVW, a1: C_REG, a6: C_ADDR, type_: 74, size: 8},
        {as: AMOVWZ, a1: C_REG, a6: C_ADDR, type_: 74, size: 8},
@@ -276,21 +275,21 @@ var optab = []Optab{
        {as: AMOVB, a1: C_REG, a6: C_ADDR, type_: 74, size: 8},
 
        /* load, long offset */
-       {as: AMOVD, a1: C_LEXT, a6: C_REG, type_: 36, size: 8, param: REGSB},
-       {as: AMOVW, a1: C_LEXT, a6: C_REG, type_: 36, size: 8, param: REGSB},
-       {as: AMOVWZ, a1: C_LEXT, a6: C_REG, type_: 36, size: 8, param: REGSB},
-       {as: AMOVBZ, a1: C_LEXT, a6: C_REG, type_: 36, size: 8, param: REGSB},
-       {as: AMOVB, a1: C_LEXT, a6: C_REG, type_: 37, size: 12, param: REGSB},
-       {as: AMOVD, a1: C_LAUTO, a6: C_REG, type_: 36, size: 8, param: REGSP},
-       {as: AMOVW, a1: C_LAUTO, a6: C_REG, type_: 36, size: 8, param: REGSP},
-       {as: AMOVWZ, a1: C_LAUTO, a6: C_REG, type_: 36, size: 8, param: REGSP},
-       {as: AMOVBZ, a1: C_LAUTO, a6: C_REG, type_: 36, size: 8, param: REGSP},
-       {as: AMOVB, a1: C_LAUTO, a6: C_REG, type_: 37, size: 12, param: REGSP},
-       {as: AMOVD, a1: C_LOREG, a6: C_REG, type_: 36, size: 8, param: REGZERO},
-       {as: AMOVW, a1: C_LOREG, a6: C_REG, type_: 36, size: 8, param: REGZERO},
-       {as: AMOVWZ, a1: C_LOREG, a6: C_REG, type_: 36, size: 8, param: REGZERO},
-       {as: AMOVBZ, a1: C_LOREG, a6: C_REG, type_: 36, size: 8, param: REGZERO},
-       {as: AMOVB, a1: C_LOREG, a6: C_REG, type_: 37, size: 12, param: REGZERO},
+       {as: AMOVD, a1: C_LEXT, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVW, a1: C_LEXT, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVWZ, a1: C_LEXT, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVBZ, a1: C_LEXT, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVB, a1: C_LEXT, a6: C_REG, type_: 37, size: 12},
+       {as: AMOVD, a1: C_LAUTO, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVW, a1: C_LAUTO, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVWZ, a1: C_LAUTO, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVBZ, a1: C_LAUTO, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVB, a1: C_LAUTO, a6: C_REG, type_: 37, size: 12},
+       {as: AMOVD, a1: C_LOREG, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVW, a1: C_LOREG, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVWZ, a1: C_LOREG, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVBZ, a1: C_LOREG, a6: C_REG, type_: 36, size: 8},
+       {as: AMOVB, a1: C_LOREG, a6: C_REG, type_: 37, size: 12},
        {as: AMOVD, a1: C_ADDR, a6: C_REG, type_: 75, size: 8},
        {as: AMOVW, a1: C_ADDR, a6: C_REG, type_: 75, size: 8},
        {as: AMOVWZ, a1: C_ADDR, a6: C_REG, type_: 75, size: 8},
@@ -304,31 +303,31 @@ var optab = []Optab{
        {as: AMOVD, a1: C_TOCADDR, a6: C_REG, type_: 95, size: 8},
 
        /* load constant */
-       {as: AMOVD, a1: C_SECON, a6: C_REG, type_: 3, size: 4, param: REGSB},
-       {as: AMOVD, a1: C_SACON, a6: C_REG, type_: 3, size: 4, param: REGSP},
-       {as: AMOVD, a1: C_LECON, a6: C_REG, type_: 26, size: 8, param: REGSB},
-       {as: AMOVD, a1: C_LACON, a6: C_REG, type_: 26, size: 8, param: REGSP},
-       {as: AMOVD, a1: C_ADDCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
-       {as: AMOVD, a1: C_ANDCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
-       {as: AMOVW, a1: C_SECON, a6: C_REG, type_: 3, size: 4, param: REGSB}, /* TO DO: check */
-       {as: AMOVW, a1: C_SACON, a6: C_REG, type_: 3, size: 4, param: REGSP},
-       {as: AMOVW, a1: C_LECON, a6: C_REG, type_: 26, size: 8, param: REGSB},
-       {as: AMOVW, a1: C_LACON, a6: C_REG, type_: 26, size: 8, param: REGSP},
-       {as: AMOVW, a1: C_ADDCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
-       {as: AMOVW, a1: C_ANDCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
-       {as: AMOVWZ, a1: C_SECON, a6: C_REG, type_: 3, size: 4, param: REGSB}, /* TO DO: check */
-       {as: AMOVWZ, a1: C_SACON, a6: C_REG, type_: 3, size: 4, param: REGSP},
-       {as: AMOVWZ, a1: C_LECON, a6: C_REG, type_: 26, size: 8, param: REGSB},
-       {as: AMOVWZ, a1: C_LACON, a6: C_REG, type_: 26, size: 8, param: REGSP},
-       {as: AMOVWZ, a1: C_ADDCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
-       {as: AMOVWZ, a1: C_ANDCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
+       {as: AMOVD, a1: C_SECON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVD, a1: C_SACON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVD, a1: C_LECON, a6: C_REG, type_: 26, size: 8},
+       {as: AMOVD, a1: C_LACON, a6: C_REG, type_: 26, size: 8},
+       {as: AMOVD, a1: C_ADDCON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVD, a1: C_ANDCON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVW, a1: C_SECON, a6: C_REG, type_: 3, size: 4}, /* TO DO: check */
+       {as: AMOVW, a1: C_SACON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVW, a1: C_LECON, a6: C_REG, type_: 26, size: 8},
+       {as: AMOVW, a1: C_LACON, a6: C_REG, type_: 26, size: 8},
+       {as: AMOVW, a1: C_ADDCON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVW, a1: C_ANDCON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVWZ, a1: C_SECON, a6: C_REG, type_: 3, size: 4}, /* TO DO: check */
+       {as: AMOVWZ, a1: C_SACON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVWZ, a1: C_LECON, a6: C_REG, type_: 26, size: 8},
+       {as: AMOVWZ, a1: C_LACON, a6: C_REG, type_: 26, size: 8},
+       {as: AMOVWZ, a1: C_ADDCON, a6: C_REG, type_: 3, size: 4},
+       {as: AMOVWZ, a1: C_ANDCON, a6: C_REG, type_: 3, size: 4},
 
        /* load unsigned/long constants (TO DO: check) */
-       {as: AMOVD, a1: C_UCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
+       {as: AMOVD, a1: C_UCON, a6: C_REG, type_: 3, size: 4},
        {as: AMOVD, a1: C_LCON, a6: C_REG, type_: 19, size: 8},
-       {as: AMOVW, a1: C_UCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
+       {as: AMOVW, a1: C_UCON, a6: C_REG, type_: 3, size: 4},
        {as: AMOVW, a1: C_LCON, a6: C_REG, type_: 19, size: 8},
-       {as: AMOVWZ, a1: C_UCON, a6: C_REG, type_: 3, size: 4, param: REGZERO},
+       {as: AMOVWZ, a1: C_UCON, a6: C_REG, type_: 3, size: 4},
        {as: AMOVWZ, a1: C_LCON, a6: C_REG, type_: 19, size: 8},
        {as: AMOVHBR, a1: C_ZOREG, a2: C_REG, a6: C_REG, type_: 45, size: 4},
        {as: AMOVHBR, a1: C_ZOREG, a6: C_REG, type_: 45, size: 4},
@@ -353,21 +352,21 @@ var optab = []Optab{
        {as: ABC, a1: C_SCON, a2: C_REG, a6: C_LR, type_: 18, size: 4},
        {as: ABC, a1: C_SCON, a2: C_REG, a6: C_CTR, type_: 18, size: 4},
        {as: ABC, a6: C_ZOREG, type_: 15, size: 8},
-       {as: AFMOVD, a1: C_SEXT, a6: C_FREG, type_: 8, size: 4, param: REGSB},
-       {as: AFMOVD, a1: C_SAUTO, a6: C_FREG, type_: 8, size: 4, param: REGSP},
-       {as: AFMOVD, a1: C_SOREG, a6: C_FREG, type_: 8, size: 4, param: REGZERO},
-       {as: AFMOVD, a1: C_LEXT, a6: C_FREG, type_: 36, size: 8, param: REGSB},
-       {as: AFMOVD, a1: C_LAUTO, a6: C_FREG, type_: 36, size: 8, param: REGSP},
-       {as: AFMOVD, a1: C_LOREG, a6: C_FREG, type_: 36, size: 8, param: REGZERO},
+       {as: AFMOVD, a1: C_SEXT, a6: C_FREG, type_: 8, size: 4},
+       {as: AFMOVD, a1: C_SAUTO, a6: C_FREG, type_: 8, size: 4},
+       {as: AFMOVD, a1: C_SOREG, a6: C_FREG, type_: 8, size: 4},
+       {as: AFMOVD, a1: C_LEXT, a6: C_FREG, type_: 36, size: 8},
+       {as: AFMOVD, a1: C_LAUTO, a6: C_FREG, type_: 36, size: 8},
+       {as: AFMOVD, a1: C_LOREG, a6: C_FREG, type_: 36, size: 8},
        {as: AFMOVD, a1: C_ZCON, a6: C_FREG, type_: 24, size: 4},
        {as: AFMOVD, a1: C_ADDCON, a6: C_FREG, type_: 24, size: 8},
        {as: AFMOVD, a1: C_ADDR, a6: C_FREG, type_: 75, size: 8},
-       {as: AFMOVD, a1: C_FREG, a6: C_SEXT, type_: 7, size: 4, param: REGSB},
-       {as: AFMOVD, a1: C_FREG, a6: C_SAUTO, type_: 7, size: 4, param: REGSP},
-       {as: AFMOVD, a1: C_FREG, a6: C_SOREG, type_: 7, size: 4, param: REGZERO},
-       {as: AFMOVD, a1: C_FREG, a6: C_LEXT, type_: 35, size: 8, param: REGSB},
-       {as: AFMOVD, a1: C_FREG, a6: C_LAUTO, type_: 35, size: 8, param: REGSP},
-       {as: AFMOVD, a1: C_FREG, a6: C_LOREG, type_: 35, size: 8, param: REGZERO},
+       {as: AFMOVD, a1: C_FREG, a6: C_SEXT, type_: 7, size: 4},
+       {as: AFMOVD, a1: C_FREG, a6: C_SAUTO, type_: 7, size: 4},
+       {as: AFMOVD, a1: C_FREG, a6: C_SOREG, type_: 7, size: 4},
+       {as: AFMOVD, a1: C_FREG, a6: C_LEXT, type_: 35, size: 8},
+       {as: AFMOVD, a1: C_FREG, a6: C_LAUTO, type_: 35, size: 8},
+       {as: AFMOVD, a1: C_FREG, a6: C_LOREG, type_: 35, size: 8},
        {as: AFMOVD, a1: C_FREG, a6: C_ADDR, type_: 74, size: 8},
        {as: AFMOVSX, a1: C_ZOREG, a2: C_REG, a6: C_FREG, type_: 45, size: 4},
        {as: AFMOVSX, a1: C_ZOREG, a6: C_FREG, type_: 45, size: 4},
@@ -442,7 +441,7 @@ var optab = []Optab{
        {as: AVSUBE, a1: C_VREG, a2: C_VREG, a3: C_VREG, a6: C_VREG, type_: 83, size: 4}, /* vector subtract extended, va-form */
 
        /* Vector multiply */
-       {as: AVMULESB, a1: C_VREG, a2: C_VREG, a6: C_VREG, type_: 82, size: 4, param: 9},    /* vector multiply, vx-form */
+       {as: AVMULESB, a1: C_VREG, a2: C_VREG, a6: C_VREG, type_: 82, size: 4},              /* vector multiply, vx-form */
        {as: AVPMSUM, a1: C_VREG, a2: C_VREG, a6: C_VREG, type_: 82, size: 4},               /* vector polynomial multiply & sum, vx-form */
        {as: AVMSUMUDM, a1: C_VREG, a2: C_VREG, a3: C_VREG, a6: C_VREG, type_: 83, size: 4}, /* vector multiply-sum, va-form */
 
@@ -684,6 +683,22 @@ func addpad(pc, a int64, ctxt *obj.Link, cursym *obj.LSym) int {
        return 0
 }
 
+// Get the implied register of a operand which doesn't specify one.  These show up
+// in handwritten asm like "MOVD R5, foosymbol" where a base register is not supplied,
+// or "MOVD R5, foo+10(SP) or pseudo-register is used.  The other common case is when
+// generating constants in register like "MOVD $constant, Rx".
+func getimpliedreg(a *obj.Addr) int {
+       switch oclass(a) {
+       case C_ZOREG, C_SOREG, C_LOREG, C_ADDCON, C_ANDCON, C_UCON, C_SCON, C_LCON:
+               return REGZERO
+       case C_SEXT, C_LEXT, C_SECON, C_LECON:
+               return REGSB
+       case C_SAUTO, C_LAUTO, C_SACON, C_LACON:
+               return REGSP
+       }
+       return 0
+}
+
 func span9(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
        p := cursym.Func().Text
        if p == nil || p.Link == nil { // handle external functions and ELF section symbols
@@ -2506,7 +2521,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
                v := int32(d)
                r := int(p.From.Reg)
                if r == 0 {
-                       r = int(o.param)
+                       r = getimpliedreg(&p.From)
                }
                if r0iszero != 0 /*TypeKind(100016)*/ && p.To.Reg == 0 && (r != 0 || v != 0) {
                        c.ctxt.Diag("literal operation on R0\n%v", p)
@@ -2579,7 +2594,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
                r := int(p.To.Reg)
 
                if r == 0 {
-                       r = int(o.param)
+                       r = getimpliedreg(&p.To)
                }
                v := c.regoff(&p.To)
                if p.To.Type == obj.TYPE_MEM && p.To.Index != 0 {
@@ -2615,7 +2630,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
                r := int(p.From.Reg)
 
                if r == 0 {
-                       r = int(o.param)
+                       r = getimpliedreg(&p.From)
                }
                v := c.regoff(&p.From)
                if p.From.Type == obj.TYPE_MEM && p.From.Index != 0 {
@@ -2646,7 +2661,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
                r := int(p.From.Reg)
 
                if r == 0 {
-                       r = int(o.param)
+                       r = getimpliedreg(&p.From)
                }
                v := c.regoff(&p.From)
                if p.From.Type == obj.TYPE_MEM && p.From.Index != 0 {
@@ -3036,7 +3051,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
                v := c.regoff(&p.From)
                r := int(p.From.Reg)
                if r == 0 {
-                       r = int(o.param)
+                       r = getimpliedreg(&p.From)
                }
                o1 = AOP_IRR(OP_ADDIS, REGTMP, uint32(r), uint32(high16adjusted(v)))
                o2 = AOP_IRR(OP_ADDI, uint32(p.To.Reg), REGTMP, uint32(v))
@@ -3180,7 +3195,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
 
                r := int(p.To.Reg)
                if r == 0 {
-                       r = int(o.param)
+                       r = getimpliedreg(&p.To)
                }
                // Offsets in DS form stores must be a multiple of 4
                inst := c.opstore(p.As)
@@ -3195,7 +3210,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
 
                r := int(p.From.Reg)
                if r == 0 {
-                       r = int(o.param)
+                       r = getimpliedreg(&p.From)
                }
                o1 = AOP_IRR(OP_ADDIS, REGTMP, uint32(r), uint32(high16adjusted(v)))
                o2 = AOP_IRR(c.opload(p.As), uint32(p.To.Reg), REGTMP, uint32(v))
@@ -3205,7 +3220,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
 
                r := int(p.From.Reg)
                if r == 0 {
-                       r = int(o.param)
+                       r = getimpliedreg(&p.From)
                }
                o1 = AOP_IRR(OP_ADDIS, REGTMP, uint32(r), uint32(high16adjusted(v)))
                o2 = AOP_IRR(c.opload(p.As), uint32(p.To.Reg), REGTMP, uint32(v))