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VM: Keep jump table address in a register.

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* libguile/vm-engine.c (VM_NAME)[HAVE_LABELS_AS_VALUES]: Rename
  `jump_table' to `jump_table_pointer'.  Add `jump_table' as a local
  variable, initialize it.

* libguile/vm-engine.h (JT_REG): New macro.
This commit is contained in:
Ludovic Courtès 2011-07-04 23:56:16 +02:00
parent c467c36374
commit 37a5970c19
2 changed files with 21 additions and 5 deletions
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8
libguile/vm-engine.h
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@ -57,6 +57,11 @@
/* too few registers! because of register allocation errors with various gcs,
just punt on explicit assignments on i386, hoping that the "register"
declaration will be sufficient. */
#elif defined __x86_64__
/* GCC 4.6 chooses %rbp for IP_REG and %rbx for SP_REG, which works
well. Tell it to keep the jump table in a r12, which is
callee-saved. */
#define JT_REG asm ("r12")
#endif
#if defined(PPC) || defined(_POWER) || defined(_IBMR2)
#define IP_REG asm("26")
@ -89,6 +94,9 @@
#ifndef FP_REG
#define FP_REG
#endif
#ifndef JT_REG
#define JT_REG
#endif
/*