From a49805b7a8a9fc05df34f14cb8b6892c723e2a61 Mon Sep 17 00:00:00 2001
From: Mathias Magnusson <mathias@magnusson.space>
Date: Sun, 1 Jun 2025 02:29:41 +0200
Subject: codegen: fix some small bugs

---
 src/codegen.zig | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/codegen.zig b/src/codegen.zig
index b9f39c9..e52fb47 100644
--- a/src/codegen.zig
+++ b/src/codegen.zig
@@ -266,12 +266,12 @@ const Instruction = packed union {
         return I.init(0b0011011, rd, 5, rs1, 0x20 << 5 | @as(i12, @intCast(by)));
     }
     /// Set less than immediate, signed.
-    /// rd = rs1 s< rs2 ? 1 : 0
+    /// rd = rs1 s< imm ? 1 : 0
     fn slti(rd: Register, rs1: Register, imm: i12) Self {
         return I.init(0b0010011, rd, 2, rs1, imm);
     }
     /// Set less than sign extended immediate, unsigned comparison.
-    /// rd = rs1 u< rs2 ? 1 : 0
+    /// rd = rs1 u< imm ? 1 : 0
     fn sltiu(rd: Register, rs1: Register, imm: i12) Self {
         return I.init(0b0010011, rd, 3, rs1, imm);
     }
@@ -336,7 +336,7 @@ const Instruction = packed union {
                 .funct3 = funct3,
                 .rs1 = rs1,
                 .rs2 = rs2,
-                .imm11_5 = umm >> 5,
+                .imm11_5 = @truncate(umm >> 5),
             } };
         }
     };
@@ -373,7 +373,7 @@ const Instruction = packed union {
         imm12: u1,
 
         fn init(opcode: Opcode, funct3: u3, rs1: Register, rs2: Register, imm: i13) Self {
-            std.debug.assert(imm % 2 == 0);
+            std.debug.assert(imm & 1 == 0);
             const umm: u13 = @bitCast(imm);
             return .{ .b = .{
                 .opcode = opcode,
@@ -383,7 +383,7 @@ const Instruction = packed union {
                 .rs1 = rs1,
                 .rs2 = rs2,
                 .imm10_5 = @truncate(umm >> 5),
-                .imm12 = umm >> 12,
+                .imm12 = @truncate(umm >> 12),
             } };
         }
     };
-- 
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