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win32.S: Use shifting for multiplication rather than repeated addition

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The jump table code added a register to itself twice to multiply by 4;
shift the register left by 2 instead.
This commit is contained in:
Josh Triplett
2014-03-21 11:01:39 -07:00
parent 4fca48901e
commit ef5890ebaf
1 changed files with 4 additions and 8 deletions
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12
src/x86/win32.S
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@@ -568,8 +568,7 @@ USCORE_SYMBOL(ffi_call_win32):
.long .Lretstruct4b-.Lstore_table /* FFI_TYPE_SMALL_STRUCT_4B */
.long .Lretstruct-.Lstore_table /* FFI_TYPE_MS_STRUCT */
1:
add %ecx, %ecx
add %ecx, %ecx
shl $2, %ecx
add (%esp),%ecx
mov (%ecx),%ecx
add (%esp),%ecx
@@ -727,8 +726,7 @@ USCORE_SYMBOL(ffi_closure_SYSV):
.long .Lcls_retmsstruct-.Lcls_store_table /* FFI_TYPE_MS_STRUCT */
1:
add %eax, %eax
add %eax, %eax
shl $2, %eax
add (%esp),%eax
mov (%eax),%eax
add (%esp),%eax
@@ -879,8 +877,7 @@ USCORE_SYMBOL(ffi_closure_raw_SYSV):
.long .Lrcls_retstruct4-.Lrcls_store_table /* FFI_TYPE_SMALL_STRUCT_4B */
.long .Lrcls_retstruct-.Lrcls_store_table /* FFI_TYPE_MS_STRUCT */
1:
add %eax, %eax
add %eax, %eax
shl $2, %eax
add (%esp),%eax
mov (%eax),%eax
add (%esp),%eax
@@ -1005,8 +1002,7 @@ USCORE_SYMBOL(ffi_closure_STDCALL):
.long .Lscls_retstruct2-.Lscls_store_table /* FFI_TYPE_SMALL_STRUCT_2B */
.long .Lscls_retstruct4-.Lscls_store_table /* FFI_TYPE_SMALL_STRUCT_4B */
1:
add %eax, %eax
add %eax, %eax
shl $2, %eax
add (%esp),%eax
mov (%eax),%eax
add (%esp),%eax