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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Surprizing PCD V4.091 assembly code |
 Posted: Fri Apr 24, 2009 12:03 am |
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Thanks to krogers for supplying the source. You may want to repeat with buffer [4096] !
| Code: | .................... char buffer[64] = {0};
*
003AA: CLR 808
003AC: CLR 80A
003AE: CLR 80C
003B0: CLR 80E
003B2: CLR 810
003B4: CLR 812
003B6: CLR 814
003B8: CLR 816
003BA: CLR 818
003BC: CLR 81A
003BE: CLR 81C
003C0: CLR 81E
003C2: CLR 820
003C4: CLR 822
003C6: CLR 824
003C8: CLR 826
003CA: CLR 828
003CC: CLR 82A
003CE: CLR 82C
003D0: CLR 82E
003D2: CLR 830
003D4: CLR 832
003D6: CLR 834
003D8: CLR 836
003DA: CLR 838
003DC: CLR 83A
003DE: CLR 83C
003E0: CLR 83E
003E2: CLR 840
003E4: CLR 842
003E6: CLR 844
003E8: CLR 846 |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Fri Apr 24, 2009 7:03 am |
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The code is inefficient, but is according to the ANSI C89 and ISO C99 standards as far as I can see.
Here a quote from the ISO/IEC 9899 chapter 6.7.8
| Quote: | 27 EXAMPLE 4 The declaration
int z[4][3] = {
{1},{2},{3},{4}
};
initializes the first column of z as specified and initializes the rest with zeros. |
This same example is in ANSI C89, chapter 3.5.7
It wouldn't hurt though to ask CCS for implementing a more efficient implementation... |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Fri Apr 24, 2009 9:19 am |
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| Quote: | | The code is inefficient, but is according to the ANSI C89 and ISO C99 standards |
Yes, no doubt about it.
Also considering the buffer[4096] case, you may want to call it ridiculous. I would actually expect a code similar to memset(), except for the superfluous MOV #0,W2.
| Code: | 04C30: MOV #1816,W1
04C32: MOV #0,W2
04C34: REPEAT #7
04C36: CLR.B [W1++] |
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