We are working on MIPS release 6 port of Debian, and fix a problem of cln.
MIPS release 6 is not full compatible with the previous releases, it removes
some instructions and changes encoding of some instruction.
the `multu' is included.
MIPS r6 drops `lo' and `hi' registers, and then removes `multu'/`mfhi'/`mflo'.
Instead it uses `mulu' to compute the low part and `muhu' to compute
the high part.
Index: cln-1.3.4/src/base/cl_low.h
===================================================================
--- cln-1.3.4.orig/src/base/cl_low.h
+++ cln-1.3.4/src/base/cl_low.h
@@ -273,10 +273,15 @@ inline uint32 mulu32_unchecked (uint32 a
unused (hi_zuweisung _hi); lo_zuweisung _lo; \
})
#elif defined(__GNUC__) && defined(__mips__) && !defined(NO_ASM)
+ #if __mips_isa_rev >= 6
+ #define MULTU_HI_LO "mulu %1,%3,%2 ; muhu %0,%3,%2"
+ #else
+ #define MULTU_HI_LO "multu %3,%2 ; mfhi %0 ; mflo %1"
+ #endif
#define mulu32(x,y,hi_zuweisung,lo_zuweisung) \
({ var register uint32 _hi; \
var register uint32 _lo; \
- __asm__("multu %3,%2 ; mfhi %0 ; mflo %1" \
+ __asm__(MULTU_HI_LO \
: "=r" (_hi), "=r" (_lo) \
: "r" ((uint32)(x)), "r" ((uint32)(y)) \
); \
Index: cln-1.3.4/src/base/digitseq/cl_asm_mips_.cc
===================================================================
--- cln-1.3.4.orig/src/base/digitseq/cl_asm_mips_.cc
+++ cln-1.3.4/src/base/digitseq/cl_asm_mips_.cc
@@ -88,9 +88,14 @@
DECLARE_FUNCTION(mulu32_)
.ent mulu32_ // Input in $4,$5, Output in $2,mulu32_high
mulu32_:
+#if __mips_isa_rev >= 6
+ mulu $2,$5,$4 // arg1 * arg2, lo
+ muhu $6,$5,$4 // arg1 * arg2, hi
+#else
multu $5,$4 // arg1 * arg2
mfhi $6 // hi
mflo $2 // lo
+#endif
sw $6,mulu32_high // hi abspeichern // Adressierung??
Deklaration??
j $31 // return
.end mulu32_
--
YunQiang Su