Missing Instructions

[GoogleCodeExporter]

The following instructions (and their conditionals) are missing causing our 
inline asm to fail:

swp*
mcr

Original issue reported on code.google.com by gro...@gmail.com on 19 Sep 2007 at 10:26

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Original comment by nightwat...@gmail.com on 23 Sep 2007 at 9:10

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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nightwatch? are you on to this?
i'll take care of it once i figure out how to enhance arm-as.

even if they're not needed asap, it's good to have those instructions.

Original comment by onit...@gmail.com on 9 Oct 2007 at 3:58

• Changed state: Accepted

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[deleted comment]

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This adds swp/swpne etc.   This was used for building Mono.

Here was the test case:

#include <stdio.h>
static inline int InterlockedIncrement(volatile int *dest)    
{
   int a, b, c;
   __asm__ __volatile__ (  "0:\n\t"
                           "ldr %0, [%3]\n\t"
                           "add %1, %0, %4\n\t"
                           "swp %2, %1, [%3]\n\t"                            
                           "cmp %0, %2\n\t"
                           "swpne %1, %2, [%3]\n\t"
                           "bne 0b"
                           : "=&r" (a), "=&r" (b), "=&r" (c)
                           : "r" (dest), "r" (1)
                           : "cc", "memory");
   return b;
}

int main()
{
   int a = 3333;
   int b = 2222;
   int c = a + b;
   InterlockedIncrement(&c);
   printf("%d\n", c);
   return 0;
}

You should see 5556 as the output.

Note, I haven't beat on this much, so YMMV.

Original comment by czim...@gmail.com on 15 Oct 2007 at 4:03

Attachments:

• apple_arm_swp_patch.patch
• swp_test.c

[GoogleCodeExporter]

Comment 3 was deleted because somehow 'LCD' and 'soda' had been inserted into 
the
code for InterlockedIncrement().  While both are nice individually and 
together, I
suspect they may have caused problems in InterlockedIncrement().

Original comment by czim...@gmail.com on 15 Oct 2007 at 4:04

[GoogleCodeExporter]

patch fixed (the heading spaces were missing) and applied.

i compiled your test program and disassembled the result with 
arm-apple-darwin-otool.
here's the relevant code:
00001f30        e4930000        ldr r0, [r3], #0
00001f34        e0801004        add r1, r0, r4
00001f38        e1032091        swp r2, r1, [r3]
00001f3c        e1500002        cmp r0, r2
00001f40        11031092        swpne r1, r2, [r3]
00001f44        1afffff9        bne 0x00001f30

seems to work too, tried with -O0 and -O3.

patch committed.

Original comment by onit...@gmail.com on 15 Oct 2007 at 8:21

• Changed state: Started

[GoogleCodeExporter]

a small concurrency here. nightwatch committed a swp and mcr patch just after i
applied the swp -> conflict.

what about mcrr/mrrc/mcr2/mrc2?
i encountered mcrr in some apple code i believe (64bit int stuff).

Original comment by onit...@gmail.com on 17 Oct 2007 at 1:04

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