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Untag values and indexes for all bytevector instructions

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* libguile/vm-engine.c (bv-s8-ref, bv-s16-ref, bv-s32-ref, bv-s64-ref):
  Unbox index and return unboxed S32 value.
  (bv-s8-set!, bv-s16-set!, bv-s32-set!, bv-s64-set!): Unbox index and
  take unboxed S32 value.
  (bv-u8-ref, bv-u16-ref, bv-u32-ref, bv-u64-ref)
  (bv-s8-set!, bv-s16-set!, bv-s32-set!, bv-s64-set!): Likewise, but
  with unsigned values.
  (bv-f32-ref, bv-f32-set!, bv-f64-ref, bv-f64-set!): Use memcpy to
  access the value so we don't have to think about alignment.  GCC will
  inline this to a single instruction on architectures that support
  unaligned access.
* libguile/vm.c (vm_error_out_of_range_uint64)
  (vm_error_out_of_range_int64): New helpers.

* module/language/cps/slot-allocation.scm (compute-var-representations):
  All bytevector ref operations produce untagged values.

* module/language/cps/types.scm (define-bytevector-accessors): Update
  for bytevector untagged indices and values.

* module/language/cps/utils.scm (compute-constant-values): Fix s64
  case.

* module/language/tree-il/compile-cps.scm (convert): Box results of all
  bytevector accesses, and unbox incoming indices and values.
This commit is contained in:
Andy Wingo 2015-11-21 11:50:15 +01:00
parent 8bf77f7192
commit a08b3d40f8
11 changed files with 151 additions and 235 deletions
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14
libguile/vm.c
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@ -447,6 +447,8 @@ static void vm_error_not_a_bytevector (const char *subr, SCM x) SCM_NORETURN SCM
static void vm_error_not_a_struct (const char *subr, SCM x) SCM_NORETURN SCM_NOINLINE;
static void vm_error_not_a_vector (const char *subr, SCM v) SCM_NORETURN SCM_NOINLINE;
static void vm_error_out_of_range (const char *subr, SCM k) SCM_NORETURN SCM_NOINLINE;
static void vm_error_out_of_range_uint64 (const char *subr, scm_t_uint64 idx) SCM_NORETURN SCM_NOINLINE;
static void vm_error_out_of_range_int64 (const char *subr, scm_t_int64 idx) SCM_NORETURN SCM_NOINLINE;
static void vm_error_no_values (void) SCM_NORETURN SCM_NOINLINE;
static void vm_error_not_enough_values (void) SCM_NORETURN SCM_NOINLINE;
static void vm_error_wrong_number_of_values (scm_t_uint32 expected) SCM_NORETURN SCM_NOINLINE;
@ -584,6 +586,18 @@ vm_error_out_of_range (const char *subr, SCM k)
scm_out_of_range (subr, k);
}
static void
vm_error_out_of_range_uint64 (const char *subr, scm_t_uint64 idx)
{
scm_out_of_range (subr, scm_from_uint64 (idx));
}
static void
vm_error_out_of_range_int64 (const char *subr, scm_t_int64 idx)
{
scm_out_of_range (subr, scm_from_int64 (idx));
}
static void
vm_error_no_values (void)
{