cmd/compile: fix wrong comment message in AMD64Ops.go

According to AMD64.rules, BTS&BTR&BTC use arg1 as the bit index,
while BT uses arg0. This CL fixes the wrong comment message in
AMD64Ops.go, which indicates all bit indexes are in arg0.

Change-Id: Idb78f4d39f7ef5ea78065ad8bc651324597e2a8a
Reviewed-on: https://go-review.googlesource.com/135419
Reviewed-by: Keith Randall <khr@golang.org>

diff --git a/src/cmd/compile/internal/ssa/gen/AMD64Ops.go b/src/cmd/compile/internal/ssa/gen/AMD64Ops.go
index 512df99694c9bedcffe33485474b186e918176ae..68facebe47e7c67e281e6fa1c8370f4522aef016 100644 (file)
--- a/src/cmd/compile/internal/ssa/gen/AMD64Ops.go
+++ b/src/cmd/compile/internal/ssa/gen/AMD64Ops.go
@@ -272,14 +272,14 @@ func init() {
                {name: "UCOMISS", argLength: 2, reg: fp2flags, asm: "UCOMISS", typ: "Flags"}, // arg0 compare to arg1, f32
                {name: "UCOMISD", argLength: 2, reg: fp2flags, asm: "UCOMISD", typ: "Flags"}, // arg0 compare to arg1, f64
 
-               {name: "BTL", argLength: 2, reg: gp2flags, asm: "BTL", typ: "Flags"},                                           // test whether bit arg0 % 32 in arg1 is set
-               {name: "BTQ", argLength: 2, reg: gp2flags, asm: "BTQ", typ: "Flags"},                                           // test whether bit arg0 % 64 in arg1 is set
-               {name: "BTCL", argLength: 2, reg: gp21, asm: "BTCL", resultInArg0: true, clobberFlags: true},                   // complement bit arg0 % 32 in arg1
-               {name: "BTCQ", argLength: 2, reg: gp21, asm: "BTCQ", resultInArg0: true, clobberFlags: true},                   // complement bit arg0 % 64 in arg1
-               {name: "BTRL", argLength: 2, reg: gp21, asm: "BTRL", resultInArg0: true, clobberFlags: true},                   // reset bit arg0 % 32 in arg1
-               {name: "BTRQ", argLength: 2, reg: gp21, asm: "BTRQ", resultInArg0: true, clobberFlags: true},                   // reset bit arg0 % 64 in arg1
-               {name: "BTSL", argLength: 2, reg: gp21, asm: "BTSL", resultInArg0: true, clobberFlags: true},                   // set bit arg0 % 32 in arg1
-               {name: "BTSQ", argLength: 2, reg: gp21, asm: "BTSQ", resultInArg0: true, clobberFlags: true},                   // set bit arg0 % 64 in arg1
+               {name: "BTL", argLength: 2, reg: gp2flags, asm: "BTL", typ: "Flags"},                                           // test whether bit arg0%32 in arg1 is set
+               {name: "BTQ", argLength: 2, reg: gp2flags, asm: "BTQ", typ: "Flags"},                                           // test whether bit arg0%64 in arg1 is set
+               {name: "BTCL", argLength: 2, reg: gp21, asm: "BTCL", resultInArg0: true, clobberFlags: true},                   // complement bit arg1%32 in arg0
+               {name: "BTCQ", argLength: 2, reg: gp21, asm: "BTCQ", resultInArg0: true, clobberFlags: true},                   // complement bit arg1%64 in arg0
+               {name: "BTRL", argLength: 2, reg: gp21, asm: "BTRL", resultInArg0: true, clobberFlags: true},                   // reset bit arg1%32 in arg0
+               {name: "BTRQ", argLength: 2, reg: gp21, asm: "BTRQ", resultInArg0: true, clobberFlags: true},                   // reset bit arg1%64 in arg0
+               {name: "BTSL", argLength: 2, reg: gp21, asm: "BTSL", resultInArg0: true, clobberFlags: true},                   // set bit arg1%32 in arg0
+               {name: "BTSQ", argLength: 2, reg: gp21, asm: "BTSQ", resultInArg0: true, clobberFlags: true},                   // set bit arg1%64 in arg0
                {name: "BTLconst", argLength: 1, reg: gp1flags, asm: "BTL", typ: "Flags", aux: "Int8"},                         // test whether bit auxint in arg0 is set, 0 <= auxint < 32
                {name: "BTQconst", argLength: 1, reg: gp1flags, asm: "BTQ", typ: "Flags", aux: "Int8"},                         // test whether bit auxint in arg0 is set, 0 <= auxint < 64
                {name: "BTCLconst", argLength: 1, reg: gp11, asm: "BTCL", resultInArg0: true, clobberFlags: true, aux: "Int8"}, // complement bit auxint in arg0, 0 <= auxint < 32