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Fix code generation error in gcc6809 It turned out that under some circumstances, the gcc optimizer would select an instruction sequence that had the sense of a branch inverted. It seems this was due to a particular instruction pattern included in the machine description not being quite right with respect to how the condition codes were tracked. Removing that instruction pattern seems to fix things (subtraction with the arguments reversed). gcc seems to be smart enough to figure out how to reorganize code to work without this reversed sense subtraction and then do the right thing.
author William Astle <lost@l-w.ca>
date Thu, 24 Mar 2016 20:07:20 -0600
parents fc166b3bbae3
children cad5937314cb
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>LW Tool Chain</A
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>William Astle</H3
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>1. <A
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>Introduction</A
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><DD
><DL
><DT
>1.1. <A
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>History</A
></DT
></DL
></DD
><DT
>2. <A
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>Output Formats</A
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><DD
><DL
><DT
>2.1. <A
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>Raw Binaries</A
></DT
><DT
>2.2. <A
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>DECB Binaries</A
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><DT
>2.3. <A
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>ASCII Hexadecimal</A
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><DT
>2.4. <A
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>Motorola S-Record</A
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>2.5. <A
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>Intel Hex</A
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><DT
>2.6. <A
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>OS9 Modules</A
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>2.7. <A
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>LWASM</A
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>3.1. <A
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>3.6.1. <A
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><DT
>3.6.5. <A
HREF="x250.html#AEN511"
>Miscelaneous Directives</A
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><DT
>3.7. <A
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>Macros</A
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>3.8. <A
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>3.9. <A
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>4.4.1. <A
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>5. <A
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>5.1. <A
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>6. <A
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>6-1. <A
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