add r1, r1, r2, lsl #1 @ screen_dest_ptr += start\r
sub r2, r3, r2 @ r2 = end - start\r
ldr r3, 6b @ r3 = io_registers\r
- ldr r3, [r3, #0x52] @ r3 = bldalpha\r
+ ldrh r3, [r3, #0x52] @ r3 = bldalpha\r
mov r4, r3, lsr #8 @ r4 = bldalpha >> 8\r
and r3, r3, #0x1F @ r3 = blend_a\r
and r4, r4, #0x1F @ r4 = blend_b\r