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C OFFSET(i)
C Expands to 4*i, or to the empty string if i is zero
define(`OFFSET', `ifelse($1,0,,eval(4*$1))')
dnl LREG(reg) gives the 8-bit register corresponding to the given 32-bit register.
define(`LREG',`ifelse(
$1, %eax, %al,
$1, %ebx, %bl,
$1, %ecx, %cl,
$1, %edx, %dl)')dnl
define(`HREG',`ifelse(
$1, %eax, %ah,
$1, %ebx, %bh,
$1, %ecx, %ch,
$1, %edx, %dh)')dnl
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