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fix(arm): group multiply instructions together

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- implement clz in ARMv5TE
This commit is contained in:
Rekai Nyangadzayi Musuka
2023-09-07 00:04:07 -05:00
parent 44b59512c0
commit 6dde25bd0f
4 changed files with 55 additions and 53 deletions
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12
src/arm/v5te.zig
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@@ -14,11 +14,10 @@ pub const arm = struct {
const swi = @import("cpu/arm/software_interrupt.zig").armSoftwareInterrupt;
const swap = @import("cpu/arm/single_data_swap.zig").singleDataSwap;
// Arithmetic Instruction Extension Space
const multiply = @import("cpu/arm/multiply.zig").multiply;
const multiplyLong = @import("cpu/arm/multiply.zig").multiplyLong;
const cop = @import("cpu/arm/coprocessor.zig");
const clz = @import("cpu/arm/misc_instructions.zig").clz;
/// Determine index into ARM InstrFn LUT
@@ -44,18 +43,15 @@ pub const arm = struct {
break :blk branchExchange(InstrFn);
} else if (i == 0x161) blk: {
break :blk clz(InstrFn);
} else if (i & 0xFCF == 0x009) blk: {
const A = i >> 5 & 1 == 1;
const S = i >> 4 & 1 == 1;
break :blk multiply(InstrFn, A, S);
} else if (i & 0xFBF == 0x109) blk: {
const B = i >> 6 & 1 == 1;
break :blk swap(InstrFn, B);
} else if (i & 0xF8F == 0x089) blk: {
} else if (i & 0xF0F == 0x009) blk: {
const L = i >> 7 & 1 == 1;
const U = i >> 6 & 1 == 1;
const A = i >> 5 & 1 == 1;
const S = i >> 4 & 1 == 1;
break :blk multiplyLong(InstrFn, U, A, S);
break :blk multiply(InstrFn, L, U, A, S);
} else if (i & 0xE49 == 0x009 or i & 0xE49 == 0x049) blk: {
const P = i >> 8 & 1 == 1;
const U = i >> 7 & 1 == 1;