diff options
| author | Paul E. Murphy <murp@ibm.com> | 2023-11-27 17:05:56 -0600 |
|---|---|---|
| committer | Paul Murphy <murp@ibm.com> | 2024-02-28 22:57:39 +0000 |
| commit | 288615ddb57a79fa78c6f13b829bd8daeeff8fa1 (patch) | |
| tree | 4fc0c594d544b4a944ac8efdbec47c8eb1b5c062 /src/cmd/internal/obj | |
| parent | a05ea985c5fdb22ef606706f2b1a99eec5574c9c (diff) | |
| download | go-288615ddb57a79fa78c6f13b829bd8daeeff8fa1.tar.xz | |
cmd/internal/obj/ppc64: generate smaller machine code for OR/XOR of uint32 values
These binary operations can be done in two sequential instructions instead of loading a
constant into REGTMP and doing the binary op.
Change-Id: Ie0ab863f9e81afad140b92b265bca4d3f0fe90b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/565215
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Diffstat (limited to 'src/cmd/internal/obj')
| -rw-r--r-- | src/cmd/internal/obj/ppc64/asm9.go | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/cmd/internal/obj/ppc64/asm9.go b/src/cmd/internal/obj/ppc64/asm9.go index 189b0fb5a8..2793600cd0 100644 --- a/src/cmd/internal/obj/ppc64/asm9.go +++ b/src/cmd/internal/obj/ppc64/asm9.go @@ -156,6 +156,8 @@ var optabBase = []Optab{ {as: AOR, a1: C_U16CON, a2: C_REG, a6: C_REG, type_: 58, size: 4}, {as: AOR, a1: C_S16CON, a6: C_REG, type_: 23, size: 8}, {as: AOR, a1: C_S16CON, a2: C_REG, a6: C_REG, type_: 23, size: 8}, + {as: AOR, a1: C_U32CON, a2: C_REG, a6: C_REG, type_: 21, size: 8}, + {as: AOR, a1: C_U32CON, a6: C_REG, type_: 21, size: 8}, {as: AOR, a1: C_32CON, a6: C_REG, type_: 23, size: 12}, {as: AOR, a1: C_32CON, a2: C_REG, a6: C_REG, type_: 23, size: 12}, {as: AORIS, a1: C_U16CON, a6: C_REG, type_: 58, size: 4}, @@ -2284,6 +2286,8 @@ const ( OP_OR = 31<<26 | 444<<1 | 0<<10 | 0 OP_ORI = 24<<26 | 0<<1 | 0<<10 | 0 OP_ORIS = 25<<26 | 0<<1 | 0<<10 | 0 + OP_XORI = 26<<26 | 0<<1 | 0<<10 | 0 + OP_XORIS = 27<<26 | 0<<1 | 0<<10 | 0 OP_RLWINM = 21<<26 | 0<<1 | 0<<10 | 0 OP_RLWNM = 23<<26 | 0<<1 | 0<<10 | 0 OP_SUBF = 31<<26 | 40<<1 | 0<<10 | 0 @@ -2866,6 +2870,23 @@ func asmout(c *ctxt9, p *obj.Prog, o *Optab, out *[5]uint32) { } o1 = AOP_IRR(c.opirr(p.As), uint32(p.To.Reg), uint32(r), uint32(v)) + case 21: /* or $u32con,rx[,ry] => oris + ori (similar for xor) */ + var opu, opl uint32 + r := uint32(p.Reg) + if r == 0 { + r = uint32(p.To.Reg) + } + switch p.As { + case AOR: + opu, opl = OP_ORIS, OP_ORI + case AXOR: + opu, opl = OP_XORIS, OP_XORI + default: + c.ctxt.Diag("unhandled opcode.\n%v", p) + } + o1 = LOP_IRR(opu, uint32(p.To.Reg), r, uint32(p.From.Offset>>16)) + o2 = LOP_IRR(opl, uint32(p.To.Reg), uint32(p.To.Reg), uint32(p.From.Offset)&0xFFFF) + case 22: /* add $lcon/$andcon,r1,r2 ==> oris+ori+add/ori+add, add $s34con,r1 ==> addis+ori+slw+ori+add */ if p.To.Reg == REGTMP || p.Reg == REGTMP { c.ctxt.Diag("can't synthesize large constant\n%v", p) |