| 修订版 | b56bd489812c685819bdec6d83f7990f21473be8 (tree) |
|---|---|
| 时间 | 2019-05-13 16:11:01 |
| 作者 | Max Filippov <jcmvbkbc@gmai...> |
| Commiter | Waldemar Brodkorb |
xtensa: don't use l32r opcode explicitly
xtensa assembler is capable of representing register loads with either
movi + addmi, l32r or const16, depending on the core configuration.
Don't use '.literal' and 'l32r' directly in the code, use 'movi' and let
the assembler relax them.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
libc/string/xtensa/strcmp.S (diff)| @@ -37,11 +37,6 @@ | ||
| 37 | 37 | .text |
| 38 | 38 | .align 4 |
| 39 | 39 | .literal_position |
| 40 | - .literal .Lmask0, MASK0 | |
| 41 | - .literal .Lmask1, MASK1 | |
| 42 | - .literal .Lmask2, MASK2 | |
| 43 | - .literal .Lmask3, MASK3 | |
| 44 | - .literal .Lmask4, MASK4 | |
| 45 | 40 | ENTRY (strcmp) |
| 46 | 41 | /* a2 = s1, a3 = s2 */ |
| 47 | 42 |
| @@ -130,10 +125,9 @@ ENTRY (strcmp) | ||
| 130 | 125 | .align 4 |
| 131 | 126 | #if XCHAL_HAVE_LOOPS |
| 132 | 127 | .Laligned: |
| 133 | - .begin no-transform | |
| 134 | 128 | movi a11, 0 |
| 135 | - l32r a4, .Lmask0 /* mask for byte 0 */ | |
| 136 | - l32r a7, .Lmask4 | |
| 129 | + movi a4, MASK0 /* mask for byte 0 */ | |
| 130 | + movi a7, MASK4 | |
| 137 | 131 | loop a11, .Laligned_done /* Loop forever. */ |
| 138 | 132 | |
| 139 | 133 | /* First unrolled loop body. */ |
| @@ -184,10 +178,10 @@ ENTRY (strcmp) | ||
| 184 | 178 | If not, loop over the rest of string using normal algorithm. */ |
| 185 | 179 | |
| 186 | 180 | bnone a8, a4, .Leq /* if byte 0 is zero */ |
| 187 | - l32r a5, .Lmask1 /* mask for byte 1 */ | |
| 188 | - l32r a6, .Lmask2 /* mask for byte 2 */ | |
| 181 | + movi a5, MASK1 /* mask for byte 1 */ | |
| 182 | + movi a6, MASK2 /* mask for byte 2 */ | |
| 189 | 183 | bnone a8, a5, .Leq /* if byte 1 is zero */ |
| 190 | - l32r a7, .Lmask3 /* mask for byte 3 */ | |
| 184 | + movi a7, MASK3 /* mask for byte 3 */ | |
| 191 | 185 | bnone a8, a6, .Leq /* if byte 2 is zero */ |
| 192 | 186 | bnone a8, a7, .Leq /* if byte 3 is zero */ |
| 193 | 187 | addi.n a2, a2, 4 /* advance s1 pointer */ |
| @@ -196,7 +190,6 @@ ENTRY (strcmp) | ||
| 196 | 190 | |
| 197 | 191 | /* align (1 mod 4) */ |
| 198 | 192 | loop a11, .Leq /* loop forever */ |
| 199 | - .end no-transform | |
| 200 | 193 | |
| 201 | 194 | l32i a8, a2, 0 /* get word from s1 */ |
| 202 | 195 | l32i a9, a3, 0 /* get word from s2 */ |
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