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authorRoland McGrath <roland@gnu.org>1995-12-04 18:37:56 +0000
committerRoland McGrath <roland@gnu.org>1995-12-04 18:37:56 +0000
commitba848785bb048e7700555ef97c9d1fd3911a3da3 (patch)
tree646ee57c65b8d2231e235caa069d7fea634e8b64 /sysdeps/i386/i586
parentc13a4f3dbd44ff03d85ad1ac35cca38c3f35d33c (diff)
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Updated from ../=mpn/gmp-1.910
Diffstat (limited to 'sysdeps/i386/i586')
-rw-r--r--sysdeps/i386/i586/lshift.S11
-rw-r--r--sysdeps/i386/i586/rshift.S11
2 files changed, 14 insertions, 8 deletions
diff --git a/sysdeps/i386/i586/lshift.S b/sysdeps/i386/i586/lshift.S
index b9f8131..c41f74e 100644
--- a/sysdeps/i386/i586/lshift.S
+++ b/sysdeps/i386/i586/lshift.S
@@ -43,12 +43,15 @@ C_SYMBOL_NAME(__mpn_lshift:)
movl 28(%esp),%ebp /* size */
movl 32(%esp),%ecx /* cnt */
+/* We can use faster code for shift-by-1 under certain conditions. */
cmp $1,%ecx
jne Lnormal
- movl %edi,%eax
- subl %esi,%eax
- cmpl %ebp,%eax
- jnc Lspecial
+ leal 4(%esi),%eax
+ cmpl %edi,%eax
+ jnc Lspecial /* jump if s_ptr + 1 >= res_ptr */
+ leal (%esi,%ebp,4),%eax
+ cmpl %eax,%edi
+ jnc Lspecial /* jump if res_ptr >= s_ptr + size */
Lnormal:
leal -4(%edi,%ebp,4),%edi
diff --git a/sysdeps/i386/i586/rshift.S b/sysdeps/i386/i586/rshift.S
index 51cde8f..a820a79 100644
--- a/sysdeps/i386/i586/rshift.S
+++ b/sysdeps/i386/i586/rshift.S
@@ -43,12 +43,15 @@ C_SYMBOL_NAME(__mpn_rshift:)
movl 28(%esp),%ebp /* size */
movl 32(%esp),%ecx /* cnt */
+/* We can use faster code for shift-by-1 under certain conditions. */
cmp $1,%ecx
jne Lnormal
- movl %edi,%eax
- subl %esi,%eax
- cmpl %ebp,%eax
- jnc Lspecial
+ leal 4(%edi),%eax
+ cmpl %esi,%eax
+ jnc Lspecial /* jump if res_ptr + 1 >= s_ptr */
+ leal (%edi,%ebp,4),%eax
+ cmpl %eax,%esi
+ jnc Lspecial /* jump if s_ptr >= res_ptr + size */
Lnormal:
movl (%esi),%edx