[sdcc-devel] [ sdcc-Feature Requests-3538387 ] Built-in strchr(), strcpy(), strncpy()

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Feature Requests item #3538387, was opened at 2012-06-27 05:47
Message generated for change (Settings changed) made by spth
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Category: z80 port
Group: None
>Status: Closed
Priority: 3
Private: No
Submitted By: Philipp Klaus Krause (spth)
Assigned to: Philipp Klaus Krause (spth)
Summary: Built-in strchr(), strcpy(), strncpy()

Initial Comment:
These three functions could be provided as built-ins:

strchr():

%2:
ld a, (hl)
cp a, b
jr Z, %1
or a, a
inc hl
jr NZ, %2
ld l, a
ld h, a
%1:

This is ten bytes long, 2 more than a call strchr(). But it leaves bc, de and iy alone. It can be customized depending on operand location (any reg or literal in place of b, any pair in place of hl).

strcpy():

xor a, a
%1:
ldi
cp a, (hl)
jr NZ, %1

this is 6 bytes, one shorter than a call to strcpy(), and it leaves iy alone.

strncpy():

xor a, a
%2:
ldi
jr Z, %1
cp a, (hl)
jr NZ, %2
%1:

This is 8 bytes, one shorter than the call to strncpy(), and it leaves iy alone.

These string functions are far less common than memcpy() and memset(), which are already implemented as built-in, so I set the priority lower than the default.

Philipp


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>Comment By: Philipp Klaus Krause (spth)
Date: 2012-07-31 18:49

Message:
Implemented by merging the smallopts branch about two weeks ago.

Philipp


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Comment By: Philipp Klaus Krause (spth)
Date: 2012-06-28 08:43

Message:
Built-in strncpy() is implemented in the smallopts branch, revision #7997.

Philipp


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Comment By: Philipp Klaus Krause (spth)
Date: 2012-06-28 07:35

Message:
Built-in strchr() is implemented in the smallopts branch, revision #7996.

Philipp


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Comment By: Philipp Klaus Krause (spth)
Date: 2012-06-27 12:19

Message:
Built-in strcpy() is implemented in the smallopts branch, revision #7993.

Philipp


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