diff options
Diffstat (limited to 'src/longlong.h')
| -rw-r--r-- | src/longlong.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/longlong.h b/src/longlong.h index f2b2c4985..179204533 100644 --- a/src/longlong.h +++ b/src/longlong.h @@ -683,7 +683,7 @@ extern UWtype __MPN(udiv_qrnnd) (UWtype *, UWtype, UWtype, UWtype); && defined (_PA_RISC2_0) && defined (_LP64) /* Note the _PA_RISC2_0 above is to exclude this code from GCC with default -march options which doesn't support these instructions. - Also the width check for 'long' is to avoid ilp32 runtimes where + Also the width check for 'long' is to avoid ILP32 runtimes where GNU/Linux and narrow HP-UX kernels are known to have issues with clobbering of context between the add and add,dc instructions. */ #define add_ssaaaa(sh, sl, ah, al, bh, bl) \ @@ -1006,7 +1006,9 @@ extern UWtype __MPN(udiv_qrnnd) (UWtype *, UWtype, UWtype, UWtype); #endif #endif /* 80x86 */ -#if defined (__amd64__) && W_TYPE_SIZE == 64 +#if defined (__amd64__) && W_TYPE_SIZE == 64 && defined (_LP64) +/* Note the width check for 'long' is to avoid ILP32 runtimes (x32) + where the ABI is known to be incompatible with the following. */ #define add_ssaaaa(sh, sl, ah, al, bh, bl) \ __asm__ ("addq %5,%q1\n\tadcq %3,%q0" \ : "=r" (sh), "=&r" (sl) \ |