diff options
Diffstat (limited to 'sysdeps/arm/armv7/strcmp.S')
| -rw-r--r-- | sysdeps/arm/armv7/strcmp.S | 93 |
1 files changed, 31 insertions, 62 deletions
diff --git a/sysdeps/arm/armv7/strcmp.S b/sysdeps/arm/armv7/strcmp.S index c8fab4b..25d0557 100644 --- a/sysdeps/arm/armv7/strcmp.S +++ b/sysdeps/arm/armv7/strcmp.S @@ -178,10 +178,8 @@ #endif ENTRY (strcmp) #if STRCMP_PRECHECK == 1 - sfi_breg src1, \ - ldrb r2, [\B] - sfi_breg src2, \ - ldrb r3, [\B] + ldrb r2, [src1] + ldrb r3, [src2] cmp r2, #1 it cs cmpcs r2, r3 @@ -211,11 +209,9 @@ ENTRY (strcmp) and tmp2, tmp1, #3 bic src2, src2, #7 lsl tmp2, tmp2, #3 /* Bytes -> bits. */ - sfi_breg src1, \ - ldrd data1a, data1b, [\B], #16 + ldrd data1a, data1b, [src1], #16 tst tmp1, #4 - sfi_breg src2, \ - ldrd data2a, data2b, [\B], #16 + ldrd data2a, data2b, [src2], #16 prepare_mask tmp1, tmp2 apply_mask data1a, tmp1 apply_mask data2a, tmp1 @@ -231,10 +227,8 @@ ENTRY (strcmp) .p2align 5,,12 /* Don't start in the tail bytes of a cache line. */ .p2align 2 /* Always word aligned. */ .Lloop_aligned8: - sfi_breg src1, \ - ldrd data1a, data1b, [\B], #16 - sfi_breg src2, \ - ldrd data2a, data2b, [\B], #16 + ldrd data1a, data1b, [src1], #16 + ldrd data2a, data2b, [src2], #16 .Lstart_realigned8: uadd8 syndrome_b, data1a, const_m1 /* Only want GE bits, */ eor syndrome_a, data1a, data2a @@ -245,10 +239,8 @@ ENTRY (strcmp) sel syndrome_b, syndrome_b, const_m1 cbnz syndrome_b, .Ldiff_in_b - sfi_breg src1, \ - ldrd data1a, data1b, [\B, #-8] - sfi_breg src2, \ - ldrd data2a, data2b, [\B, #-8] + ldrd data1a, data1b, [src1, #-8] + ldrd data2a, data2b, [src2, #-8] uadd8 syndrome_b, data1a, const_m1 /* Only want GE bits, */ eor syndrome_a, data1a, data2a sel syndrome_a, syndrome_a, const_m1 @@ -279,19 +271,15 @@ ENTRY (strcmp) /* Unrolled by a factor of 2, to reduce the number of post-increment operations. */ .Lloop_aligned4: - sfi_breg src1, \ - ldr data1, [\B], #8 - sfi_breg src2, \ - ldr data2, [\B], #8 + ldr data1, [src1], #8 + ldr data2, [src2], #8 .Lstart_realigned4: uadd8 syndrome, data1, const_m1 /* Only need GE bits. */ eor syndrome, data1, data2 sel syndrome, syndrome, const_m1 cbnz syndrome, .Laligned4_done - sfi_breg src1, \ - ldr data1, [\B, #-4] - sfi_breg src2, \ - ldr data2, [\B, #-4] + ldr data1, [src1, #-4] + ldr data2, [src2, #-4] uadd8 syndrome, data1, const_m1 eor syndrome, data1, data2 sel syndrome, syndrome, const_m1 @@ -307,11 +295,9 @@ ENTRY (strcmp) masking off the unwanted loaded data to prevent a difference. */ lsl tmp1, tmp1, #3 /* Bytes -> bits. */ bic src1, src1, #3 - sfi_breg src1, \ - ldr data1, [\B], #8 + ldr data1, [src1], #8 bic src2, src2, #3 - sfi_breg src2, \ - ldr data2, [\B], #8 + ldr data2, [src2], #8 prepare_mask tmp1, tmp1 apply_mask data1, tmp1 @@ -324,30 +310,26 @@ ENTRY (strcmp) sub src2, src2, tmp1 bic src1, src1, #3 lsls tmp1, tmp1, #31 - sfi_breg src1, \ - ldr data1, [\B], #4 + ldr data1, [src1], #4 beq .Laligned_m2 bcs .Laligned_m1 #if STRCMP_PRECHECK == 0 - sfi_breg src2, \ - ldrb data2, [\B, #1] + ldrb data2, [src2, #1] uxtb tmp1, data1, ror #BYTE1_OFFSET subs tmp1, tmp1, data2 bne .Lmisaligned_exit cbz data2, .Lmisaligned_exit .Laligned_m2: - sfi_breg src2, \ - ldrb data2, [\B, #2] + ldrb data2, [src2, #2] uxtb tmp1, data1, ror #BYTE2_OFFSET subs tmp1, tmp1, data2 bne .Lmisaligned_exit cbz data2, .Lmisaligned_exit .Laligned_m1: - sfi_breg src2, \ - ldrb data2, [\B, #3] + ldrb data2, [src2, #3] uxtb tmp1, data1, ror #BYTE3_OFFSET subs tmp1, tmp1, data2 bne .Lmisaligned_exit @@ -356,16 +338,14 @@ ENTRY (strcmp) #else /* STRCMP_PRECHECK */ /* If we've done the pre-check, then we don't need to check the first byte again here. */ - sfi_breg src2, \ - ldrb data2, [\B, #2] + ldrb data2, [src2, #2] uxtb tmp1, data1, ror #BYTE2_OFFSET subs tmp1, tmp1, data2 bne .Lmisaligned_exit cbz data2, .Lmisaligned_exit .Laligned_m2: - sfi_breg src2, \ - ldrb data2, [\B, #3] + ldrb data2, [src2, #3] uxtb tmp1, data1, ror #BYTE3_OFFSET subs tmp1, tmp1, data2 bne .Lmisaligned_exit @@ -391,13 +371,11 @@ ENTRY (strcmp) cfi_restore_state /* src1 is word aligned, but src2 has no common alignment with it. */ - sfi_breg src1, \ - ldr data1, [\B], #4 + ldr data1, [src1], #4 lsls tmp1, src2, #31 /* C=src2[1], Z=src2[0]. */ bic src2, src2, #3 - sfi_breg src2, \ - ldr data2, [\B], #4 + ldr data2, [src2], #4 bhi .Loverlap1 /* C=1, Z=0 => src2[1:0] = 0b11. */ bcs .Loverlap2 /* C=1, Z=1 => src2[1:0] = 0b10. */ @@ -409,13 +387,11 @@ ENTRY (strcmp) sel syndrome, syndrome, const_m1 bne 4f cbnz syndrome, 5f - sfi_breg src2, \ - ldr data2, [\B], #4 + ldr data2, [src2], #4 eor tmp1, tmp1, data1 cmp tmp1, data2, S2HI #24 bne 6f - sfi_breg src1, \ - ldr data1, [\B], #4 + ldr data1, [src1], #4 b .Loverlap3 4: S2LO data2, data2, #8 @@ -427,8 +403,7 @@ ENTRY (strcmp) /* We can only get here if the MSB of data1 contains 0, so fast-path the exit. */ - sfi_breg src2, \ - ldrb result, [\B] + ldrb result, [src2] ldrd r4, r5, [sp], #16 cfi_remember_state cfi_def_cfa_offset (0) @@ -454,13 +429,11 @@ ENTRY (strcmp) sel syndrome, syndrome, const_m1 bne 4f cbnz syndrome, 5f - sfi_breg src2, \ - ldr data2, [\B], #4 + ldr data2, [src2], #4 eor tmp1, tmp1, data1 cmp tmp1, data2, S2HI #16 bne 6f - sfi_breg src1, \ - ldr data1, [\B], #4 + ldr data1, [src1], #4 b .Loverlap2 4: S2LO data2, data2, #16 @@ -469,8 +442,7 @@ ENTRY (strcmp) ands syndrome, syndrome, const_m1, S2LO #16 bne .Lstrcmp_done_equal - sfi_breg src2, \ - ldrh data2, [\B] + ldrh data2, [src2] S2LO data1, data1, #16 #ifdef __ARM_BIG_ENDIAN lsl data2, data2, #16 @@ -490,13 +462,11 @@ ENTRY (strcmp) sel syndrome, syndrome, const_m1 bne 4f cbnz syndrome, 5f - sfi_breg src2, \ - ldr data2, [\B], #4 + ldr data2, [src2], #4 eor tmp1, tmp1, data1 cmp tmp1, data2, S2HI #8 bne 6f - sfi_breg src1, \ - ldr data1, [\B], #4 + ldr data1, [src1], #4 b .Loverlap1 4: S2LO data2, data2, #24 @@ -504,8 +474,7 @@ ENTRY (strcmp) 5: tst syndrome, #LSB bne .Lstrcmp_done_equal - sfi_breg src2, \ - ldr data2, [\B] + ldr data2, [src2] 6: S2LO data1, data1, #8 bic data2, data2, #MSB |