The result of io port read is discarded.

The Small Device C Compiler (SDCC), targeting 8-bit architectures

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#2875 The result of io port read is discarded.

Status: closed-fixed

Owner: Philipp Klaus Krause

Labels: None

Category: Z80

Priority: 5

Updated: 2019-02-13

Created: 2019-02-12

Creator: Jakub Ladman

Private: No

Hi
The attached code for Z80 is not compiled correctly. The first result of two successive io port reads is discarded. The io ports are not treated as volatile (also when volatile keyword is put before the sfr declaration).

SDCC : z80/ez80_z80 3.8.6 #10937 (Linux)
Thank You

2 Attachments

z80_discarded_io_read.asm

z80_discarded_io_read.c

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Philipp Klaus Krause - 2019-02-13

status: open --> closed-fixed

assigned_to: Philipp Klaus Krause
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Philipp Klaus Krause - 2019-02-13

Fixed in [r10960].

Philipp

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The result of io port read is discarded.

The Small Device C Compiler (SDCC), targeting 8-bit architectures

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#2875 The result of io port read is discarded.

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