From b618dbdf6989235242ef35f9b676848794fc2229 Mon Sep 17 00:00:00 2001
From: Koakuma <koachan@protonmail.com>
Date: Sun, 15 May 2022 22:10:27 +0700
Subject: [PATCH] stage2: sparc64: Implement SPARCv9 mulx

---
 src/arch/sparc64/Emit.zig | 4 +++-
 src/arch/sparc64/bits.zig | 8 ++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/arch/sparc64/Emit.zig b/src/arch/sparc64/Emit.zig
index 6f6a6d2327..6f30f785c5 100644
--- a/src/arch/sparc64/Emit.zig
+++ b/src/arch/sparc64/Emit.zig
@@ -94,7 +94,7 @@ pub fn emitMir(
 
             .@"or" => try emit.mirArithmetic3Op(inst),
 
-            .mulx => @panic("TODO implement sparc64 mulx"),
+            .mulx => try emit.mirArithmetic3Op(inst),
 
             .nop => try emit.mirNop(),
 
@@ -207,6 +207,7 @@ fn mirArithmetic3Op(emit: *Emit, inst: Mir.Inst.Index) !void {
             .lduw => try emit.writeInstruction(Instruction.lduw(i13, rs1, imm, rd)),
             .ldx => try emit.writeInstruction(Instruction.ldx(i13, rs1, imm, rd)),
             .@"or" => try emit.writeInstruction(Instruction.@"or"(i13, rs1, imm, rd)),
+            .mulx => try emit.writeInstruction(Instruction.mulx(i13, rs1, imm, rd)),
             .save => try emit.writeInstruction(Instruction.save(i13, rs1, imm, rd)),
             .restore => try emit.writeInstruction(Instruction.restore(i13, rs1, imm, rd)),
             .stb => try emit.writeInstruction(Instruction.stb(i13, rs1, imm, rd)),
@@ -227,6 +228,7 @@ fn mirArithmetic3Op(emit: *Emit, inst: Mir.Inst.Index) !void {
             .lduw => try emit.writeInstruction(Instruction.lduw(Register, rs1, rs2, rd)),
             .ldx => try emit.writeInstruction(Instruction.ldx(Register, rs1, rs2, rd)),
             .@"or" => try emit.writeInstruction(Instruction.@"or"(Register, rs1, rs2, rd)),
+            .mulx => try emit.writeInstruction(Instruction.mulx(Register, rs1, rs2, rd)),
             .save => try emit.writeInstruction(Instruction.save(Register, rs1, rs2, rd)),
             .restore => try emit.writeInstruction(Instruction.restore(Register, rs1, rs2, rd)),
             .stb => try emit.writeInstruction(Instruction.stb(Register, rs1, rs2, rd)),
diff --git a/src/arch/sparc64/bits.zig b/src/arch/sparc64/bits.zig
index cb7fe36810..f4226b49da 100644
--- a/src/arch/sparc64/bits.zig
+++ b/src/arch/sparc64/bits.zig
@@ -1197,6 +1197,14 @@ pub const Instruction = union(enum) {
         };
     }
 
+    pub fn mulx(comptime s2: type, rs1: Register, rs2: s2, rd: Register) Instruction {
+        return switch (s2) {
+            Register => format3a(0b10, 0b00_1001, rs1, rs2, rd),
+            i13 => format3b(0b10, 0b00_1001, rs1, rs2, rd),
+            else => unreachable,
+        };
+    }
+
     pub fn nop() Instruction {
         return sethi(0, .g0);
     }