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