(LREG, HREG, XREG): New macros.

Rev: nettle/x86_64/machine.m4:1.2

diff --git a/x86_64/machine.m4 b/x86_64/machine.m4
index 887bf3b3a7a9fe849a05add58040e938733e0bf0..e3b382447788e093a4687c34ebd86a0b815c1d58 100644 (file)
--- a/x86_64/machine.m4
+++ b/x86_64/machine.m4
@@ -1,3 +1,44 @@
 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 64-bit register.
+define(<LREG>,<ifelse(
+       $1, %rax, %al,
+       $1, %rbx, %bl,
+       $1, %rcx, %cl,
+       $1, %rdx, %dl,
+       $1, %rsi, %sil,
+       $1, %rdi, %dil,
+       $1, %rbp, %bpl,
+       $1, %r8, %r8b,
+       $1, %r9, %r9b,
+       $1, %r10, %r10b,
+       $1, %r11, %r11b,
+       $1, %r12, %r12b,
+       $1, %r13, %r13b,
+       $1, %r14, %r14b,
+       $1, %r15, %r15b)>)dnl
+
+define(<HREG>,<ifelse(
+       $1, %rax, %ah,
+       $1, %rbx, %bh,
+       $1, %rcx, %ch,
+       $1, %rdx, %dh)>)dnl
+
+define(<XREG>,<ifelse(
+       $1, %rax, %eax,
+       $1, %rbx, %ebx,
+       $1, %rcx, %ecx,
+       $1, %rdx, %edx,
+       $1, %rsi, %esi,
+       $1, %rdi, %edi,
+       $1, %rbp, %ebp,
+       $1, %r8, %r8d,
+       $1, %r9, %r9d,
+       $1, %r10, %r10d,
+       $1, %r11, %r11d,
+       $1, %r12, %r12d,
+       $1, %r13, %r13d,
+       $1, %r14, %r14d,
+       $1, %r15, %r15d)>)dnl