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tcg: Always enable TCGv type checking

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Instead of using structures, which imply some amount of overhead
on certain ABIs, use pointer types.

This actually reduces the size of the binaries vs a NON-debug
build on ppc64 and x86_64, due to a reduction in the number of
sign-extension insns.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-09-16 09:51:46 -07:00 committed by Richard Henderson
parent 58099c8066
commit b6c73a6d45
1 changed files with 34 additions and 55 deletions
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89
tcg/tcg.h
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@ -274,75 +274,54 @@ typedef enum TCGMemOp {
typedef tcg_target_ulong TCGArg;
/* Define a type and accessor macros for variables. Using a struct is
nice because it gives some level of type safely. Ideally the compiler
be able to see through all this. However in practice this is not true,
especially on targets with braindamaged ABIs (e.g. i386).
We use plain int by default to avoid this runtime overhead.
Users of tcg_gen_* don't need to know about any of this, and should
treat TCGv as an opaque type.
/* Define a type and accessor macros for variables. Using pointer types
is nice because it gives some level of type safely. Converting to and
from intptr_t rather than int reduces the number of sign-extension
instructions that get implied on 64-bit hosts. Users of tcg_gen_* don't
need to know about any of this, and should treat TCGv as an opaque type.
In addition we do typechecking for different types of variables. TCGv_i32
and TCGv_i64 are 32/64-bit variables respectively. TCGv and TCGv_ptr
are aliases for target_ulong and host pointer sized values respectively.
*/
are aliases for target_ulong and host pointer sized values respectively. */
#ifdef CONFIG_DEBUG_TCG
#define DEBUG_TCGV 1
#endif
typedef struct TCGv_i32_d *TCGv_i32;
typedef struct TCGv_i64_d *TCGv_i64;
typedef struct TCGv_ptr_d *TCGv_ptr;
#ifdef DEBUG_TCGV
typedef struct
static inline TCGv_i32 QEMU_ARTIFICIAL MAKE_TCGV_I32(intptr_t i)
{
int i32;
} TCGv_i32;
return (TCGv_i32)i;
}
typedef struct
static inline TCGv_i64 QEMU_ARTIFICIAL MAKE_TCGV_I64(intptr_t i)
{
int i64;
} TCGv_i64;
return (TCGv_i64)i;
}
typedef struct {
int iptr;
} TCGv_ptr;
static inline TCGv_ptr QEMU_ARTIFICIAL MAKE_TCGV_PTR(intptr_t i)
{
return (TCGv_ptr)i;
}
static inline intptr_t QEMU_ARTIFICIAL GET_TCGV_I32(TCGv_i32 t)
{
return (intptr_t)t;
}
static inline intptr_t QEMU_ARTIFICIAL GET_TCGV_I64(TCGv_i64 t)
{
return (intptr_t)t;
}
static inline intptr_t QEMU_ARTIFICIAL GET_TCGV_PTR(TCGv_ptr t)
{
return (intptr_t)t;
}
#define MAKE_TCGV_I32(i) __extension__ \
({ TCGv_i32 make_tcgv_tmp = {i}; make_tcgv_tmp;})
#define MAKE_TCGV_I64(i) __extension__ \
({ TCGv_i64 make_tcgv_tmp = {i}; make_tcgv_tmp;})
#define MAKE_TCGV_PTR(i) __extension__ \
({ TCGv_ptr make_tcgv_tmp = {i}; make_tcgv_tmp; })
#define GET_TCGV_I32(t) ((t).i32)
#define GET_TCGV_I64(t) ((t).i64)
#define GET_TCGV_PTR(t) ((t).iptr)
#if TCG_TARGET_REG_BITS == 32
#define TCGV_LOW(t) MAKE_TCGV_I32(GET_TCGV_I64(t))
#define TCGV_HIGH(t) MAKE_TCGV_I32(GET_TCGV_I64(t) + 1)
#endif
#else /* !DEBUG_TCGV */
typedef int TCGv_i32;
typedef int TCGv_i64;
#if TCG_TARGET_REG_BITS == 32
#define TCGv_ptr TCGv_i32
#else
#define TCGv_ptr TCGv_i64
#endif
#define MAKE_TCGV_I32(x) (x)
#define MAKE_TCGV_I64(x) (x)
#define MAKE_TCGV_PTR(x) (x)
#define GET_TCGV_I32(t) (t)
#define GET_TCGV_I64(t) (t)
#define GET_TCGV_PTR(t) (t)
#if TCG_TARGET_REG_BITS == 32
#define TCGV_LOW(t) (t)
#define TCGV_HIGH(t) ((t) + 1)
#endif
#endif /* DEBUG_TCGV */
#define TCGV_EQUAL_I32(a, b) (GET_TCGV_I32(a) == GET_TCGV_I32(b))
#define TCGV_EQUAL_I64(a, b) (GET_TCGV_I64(a) == GET_TCGV_I64(b))
#define TCGV_EQUAL_PTR(a, b) (GET_TCGV_PTR(a) == GET_TCGV_PTR(b))