* config/rs6000/linux64.h (SUBSUBTARGET_OVERRIDE_OPTIONS): Ensure

[pf3gnuchains/gcc-fork.git] / gcc / config / rs6000 / rs6000.h

diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index 722fc84..f09c694 100644 (file)
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -160,7 +160,10 @@ extern int target_flags;
    function, and one less allocable register.  */
 #define MASK_MINIMAL_TOC       0x00000200
 
-/* Nonzero for the 64bit model: longs and pointers are 64 bits.  */
+/* Nonzero for the 64 bit ABIs: longs and pointers are 64 bits.  The
+   chip is running in "64-bit mode", in which CR0 is set in dot
+   operations based on all 64 bits of the register, bdnz works on 64-bit
+   ctr, lr is 64 bits, and so on.  Requires MASK_POWERPC64.  */
 #define MASK_64BIT             0x00000400
 
 /* Disable use of FPRs.  */