| // Copyright 2025 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package asmgen |
| |
| var ArchPPC64x = &Arch{ |
| Name: "ppc64x", |
| Build: "ppc64 || ppc64le", |
| WordBits: 64, |
| WordBytes: 8, |
| CarrySafeLoop: true, |
| |
| // Note: The old, hand-written ppc64x assembly used MOVDU |
| // to avoid explicit pointer updates in a few routines, but the new |
| // generated code runs just as fast, so we haven't bothered to try |
| // to add that back. (It's not trivial; you'd have to keep the pointers |
| // shifted one word in order to make the semantics work.) |
| // |
| // The old assembly also used some complex vector instructions |
| // to implement lshVU and rshVU, but the generated code that uses |
| // ordinary integer instructions is much faster than the vector code was, |
| // at least on the power10 gomote. |
| |
| regs: []string{ |
| // R0 is 0 by convention. |
| // R1 is SP. |
| // R2 is TOC. |
| // R30 is g. |
| // R31 is the assembler/linker temporary (which we use too). |
| "R3", "R4", "R5", "R6", "R7", "R8", "R9", |
| "R10", "R11", "R12" /*R13 is TLS*/, "R14", "R15", "R16", "R17", "R18", "R19", |
| "R20", "R21", "R22", "R23", "R24", "R25", "R26", "R27", "R28", "R29", |
| }, |
| reg0: "R0", |
| regTmp: "R31", |
| |
| // Note: Could write an addF and subF to use ADDZE and SUBZE, |
| // but we have R0 so it doesn't seem to matter much. |
| |
| mov: "MOVD", |
| add: "ADD", |
| adds: "ADDC", |
| adcs: "ADDE", |
| sub: "SUB", |
| subs: "SUBC", |
| sbcs: "SUBE", |
| mul: "MULLD", |
| mulhi: "MULHDU", |
| lsh: "SLD", |
| rsh: "SRD", |
| and: "ANDCC", // regular AND does not accept immediates |
| or: "OR", |
| xor: "XOR", |
| |
| jmpZero: "CMP %[1]s, $0; BEQ %[2]s", |
| jmpNonZero: "CMP %s, $0; BNE %s", |
| |
| // Note: Using CTR means that we could free the count register |
| // during the loop body, but the portable logic doesn't know that, |
| // and we're not hurting for registers. |
| loopTop: "CMP %[1]s, $0; BEQ %[2]s; MOVD %[1]s, CTR", |
| loopBottom: "BDNZ %[2]s", |
| } |
