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tcg: Optionally sign-extend 32-bit arguments for 64-bit hosts.

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Some hosts (amd64, ia64) have an ABI that ignores the high bits
of the 64-bit register when passing 32-bit arguments.  Others
require the value to be properly sign-extended for the type.
I.e. "int32_t" must be sign-extended and "uint32_t" must be
zero-extended to 64-bits.

To effect this, extend the "sizemask" parameter to tcg_gen_callN
to include the signedness of the type of each parameter.  If the
tcg target requires it, extend each 32-bit argument into a 64-bit
temp and pass that to the function call.

This ABI feature is required by sparc64, ppc64 and s390x.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2010-06-14 17:35:27 -07:00 • committed by Aurelien Jarno
parent d2c5efd89f
commit 2bece2c883
8 changed files with 193 additions and 36 deletions
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4
tcg/sparc/tcg-target.h
View file

@ -87,6 +87,10 @@ enum {
#define TCG_TARGET_STACK_ALIGN 8
#endif
#ifdef __arch64__
#define TCG_TARGET_EXTEND_ARGS 1
#endif
/* optional instructions */
#define TCG_TARGET_HAS_div_i32
// #define TCG_TARGET_HAS_rot_i32