定义了一个宏如下:
.MACRO DELAY_MS ldi @0, LOW(@2 * 4000)
ldi @1, HIGH(@2 * 4000)
delay_ms_loop:
sbiw @0, 1
brne delay_ms_loop
.ENDMACRO
程序调用时
DELAY_MS r24, r25, 2
但是编译后丢失了 ldi @1, HIGH(@2 * 4000)这一行，这是为何？
91: DELAY_MS r24, r25, 2
+0000003E: E480 LDI R24,0x40 Load immediate
@0000003F: delay_ms_loop@DELAY_MS@996
+0000003F: 9701 SBIW R24,0x01 Subtract immediate from word
+00000040: F7F1 BRNE PC-0x01 Branch if not equal |
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