Changeset 59054 in vbox

Timestamp:

Dec 8, 2015 12:37:28 PM (9 years ago)

Author:

vboxsync

Message:

ASMAtomicXchgU64.asm: fixed unused 64-bit code versions.

File:

trunk/src/VBox/Runtime/common/asm/ASMAtomicXchgU64.asm

-              r56290
+              r59054
 ; @param    u64New   x86:ebp+c   gcc:rsi  msc:rdx
+;
+; @returns  bool result: true if successfully exchanged, false if not.
+;           x86:al
+; @returns Current (i.e. old) *pu64 value (x86:eax:edx, 64-bit: rax)
+;
 BEGINPROC_EXPORTED ASMAtomicXchgU64
 %ifdef RT_ARCH_AMD64
  %ifdef ASM_CALL64_MSC
+        mov     rax, r8
+.try_again:
+        lock cmpxchg [rcx], rdx
+        xchg    [rcx], rdx
  %else
+.try_again:
+        mov     rax, rcx
+        lock cmpxchg [rdi], rsi
+        xchg    [rdi], rsi
  %endif
-        jnz     .try_again
         ret
 %endif

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