diff options
Diffstat (limited to 'arch/x86/lib/memmove_64.S')
-rw-r--r-- | arch/x86/lib/memmove_64.S | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/arch/x86/lib/memmove_64.S b/arch/x86/lib/memmove_64.S index bbfa6b269ece..0f8a0d0331b9 100644 --- a/arch/x86/lib/memmove_64.S +++ b/arch/x86/lib/memmove_64.S | |||
@@ -5,7 +5,6 @@ | |||
5 | * This assembly file is re-written from memmove_64.c file. | 5 | * This assembly file is re-written from memmove_64.c file. |
6 | * - Copyright 2011 Fenghua Yu <fenghua.yu@intel.com> | 6 | * - Copyright 2011 Fenghua Yu <fenghua.yu@intel.com> |
7 | */ | 7 | */ |
8 | #define _STRING_C | ||
9 | #include <linux/linkage.h> | 8 | #include <linux/linkage.h> |
10 | #include <asm/dwarf2.h> | 9 | #include <asm/dwarf2.h> |
11 | #include <asm/cpufeature.h> | 10 | #include <asm/cpufeature.h> |
@@ -44,6 +43,8 @@ ENTRY(__memmove) | |||
44 | jg 2f | 43 | jg 2f |
45 | 44 | ||
46 | .Lmemmove_begin_forward: | 45 | .Lmemmove_begin_forward: |
46 | ALTERNATIVE "", "movq %rdx, %rcx; rep movsb; retq", X86_FEATURE_ERMS | ||
47 | |||
47 | /* | 48 | /* |
48 | * movsq instruction have many startup latency | 49 | * movsq instruction have many startup latency |
49 | * so we handle small size by general register. | 50 | * so we handle small size by general register. |
@@ -207,21 +208,5 @@ ENTRY(__memmove) | |||
207 | 13: | 208 | 13: |
208 | retq | 209 | retq |
209 | CFI_ENDPROC | 210 | CFI_ENDPROC |
210 | |||
211 | .section .altinstr_replacement,"ax" | ||
212 | .Lmemmove_begin_forward_efs: | ||
213 | /* Forward moving data. */ | ||
214 | movq %rdx, %rcx | ||
215 | rep movsb | ||
216 | retq | ||
217 | .Lmemmove_end_forward_efs: | ||
218 | .previous | ||
219 | |||
220 | .section .altinstructions,"a" | ||
221 | altinstruction_entry .Lmemmove_begin_forward, \ | ||
222 | .Lmemmove_begin_forward_efs,X86_FEATURE_ERMS, \ | ||
223 | .Lmemmove_end_forward-.Lmemmove_begin_forward, \ | ||
224 | .Lmemmove_end_forward_efs-.Lmemmove_begin_forward_efs,0 | ||
225 | .previous | ||
226 | ENDPROC(__memmove) | 211 | ENDPROC(__memmove) |
227 | ENDPROC(memmove) | 212 | ENDPROC(memmove) |