a4                 29 arch/alpha/include/uapi/asm/regdef.h #define a4	$20
a4                 81 arch/m68k/lib/divsi3.S #define a4 REG (a4)
a4                 81 arch/m68k/lib/modsi3.S #define a4 REG (a4)
a4                 79 arch/m68k/lib/mulsi3.S #define a4 REG (a4)
a4                 79 arch/m68k/lib/udivsi3.S #define a4 REG (a4)
a4                 79 arch/m68k/lib/umodsi3.S #define a4 REG (a4)
a4                 73 arch/mips/include/asm/regdef.h #define a4	$8	/* arg reg 64 bit; caller saved in 32 bit */