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wasm:@byteSwap for 24 bit integers

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This commit is contained in:
Luuk de Gram 2022-06-08 19:08:52 +02:00
parent bc499de328
commit 180baa0546
1 changed files with 22 additions and 3 deletions
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25
src/arch/wasm/CodeGen.zig
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@ -4714,12 +4714,31 @@ fn airByteSwap(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
switch (int_info.bits) {
16 => {
const shl_res = try self.binOp(operand, .{ .imm32 = 8 }, ty, .shl);
const tmp = try self.binOp(operand, .{ .imm32 = 0xFF00 }, ty, .@"and");
const shr_res = try self.binOp(tmp, .{ .imm32 = 8 }, ty, .shr);
const lhs = try self.binOp(shl_res, .{ .imm32 = 0xFF00 }, ty, .@"and");
const shr_res = try self.binOp(operand, .{ .imm32 = 8 }, ty, .shr);
const res = if (int_info.signedness == .signed) blk: {
break :blk try self.wrapOperand(shr_res, Type.u8);
} else shr_res;
return self.binOp(shl_res, res, ty, .@"or");
return self.binOp(lhs, res, ty, .@"or");
},
24 => {
const msb = try self.wrapOperand(operand, Type.u16);
const lsb = try self.wrapBinOp(operand, .{ .imm32 = 16 }, Type.u8, .shr);
const shl_res = try self.binOp(msb, .{ .imm32 = 8 }, Type.u16, .shl);
const lhs = try self.binOp(shl_res, .{ .imm32 = 0xFF0000 }, Type.u16, .@"and");
const shr_res = try self.binOp(msb, .{ .imm32 = 8 }, ty, .shr);
const res = if (int_info.signedness == .signed) blk: {
break :blk try self.wrapOperand(shr_res, Type.u8);
} else shr_res;
const lhs_tmp = try self.binOp(lhs, res, ty, .@"or");
const lhs_result = try self.binOp(lhs_tmp, .{ .imm32 = 8 }, ty, .shr);
const rhs_wrap = try self.wrapOperand(msb, Type.u8);
const rhs_result = try self.binOp(rhs_wrap, .{ .imm32 = 16 }, ty, .shl);
const tmp = try self.binOp(lhs_result, rhs_result, ty, .@"or");
return self.binOp(tmp, lsb, ty, .@"or");
},
32 => {
const shl_tmp = try self.binOp(operand, .{ .imm32 = 8 }, ty, .shl);