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expansion plus new spelling words

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Perry Kivolowitz 2022-05-20 09:53:24 -05:00
parent 6ed5185eba
commit 22fc0c35e5
1 changed files with 12 additions and 1 deletions
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section_1/if/README.md
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@ -173,7 +173,8 @@ T: .asciz "TRUE" // 24
`Line 11` is one way of loading the address represented by a label. `Line 11` is one way of loading the address represented by a label.
In this case, the label `T` corresponds to the address to the first In this case, the label `T` corresponds to the address to the first
letter of the C string "TRUE". letter of the C string "TRUE". `Line 15` loads the address of the C
string containing "FALSE".
The occurrences of `.asciz` on `line 23` and `line 24` are invocations of The occurrences of `.asciz` on `line 23` and `line 24` are invocations of
an *assembler directive* the creates a C string. Recall that C strings are NULL an *assembler directive* the creates a C string. Recall that C strings are NULL
@ -214,4 +215,14 @@ resulting value but does set the condition bits.
### 3 ### 3
We claim `if05.s` (the complete program given above) is too long! By two instructions,
that is. Copy `if05.s` to make `if06.s`. Then, modify `if06.s` to be two instructions
shorter.
To do so, notice that there are two occurrences of `bl puts` in `if05.s`. Refactor
the code to have only one.
Answer: The shorter version is found [here](./if06.s). It is well documented and
should be studied.
### 4 ### 4