diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power8/strcpy.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power8/strcpy.S | 167 |
1 files changed, 159 insertions, 8 deletions
diff --git a/sysdeps/powerpc/powerpc64/power8/strcpy.S b/sysdeps/powerpc/powerpc64/power8/strcpy.S index 5130831c6a..956faf714f 100644 --- a/sysdeps/powerpc/powerpc64/power8/strcpy.S +++ b/sysdeps/powerpc/powerpc64/power8/strcpy.S @@ -1,5 +1,5 @@ /* Optimized strcpy/stpcpy implementation for PowerPC64/POWER8. - Copyright (C) 2015-2016 Free Software Foundation, Inc. + Copyright (C) 2015-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -19,10 +19,18 @@ #include <sysdep.h> #ifdef USE_AS_STPCPY -# define FUNC_NAME __stpcpy +# ifndef STPCPY +# define FUNC_NAME __stpcpy +# else +# define FUNC_NAME STPCPY +# endif #else -# define FUNC_NAME strcpy -#endif +# ifndef STRCPY +# define FUNC_NAME strcpy +# else +# define FUNC_NAME STRCPY +# endif +#endif /* !USE_AS_STPCPY */ /* Implements the function @@ -39,8 +47,8 @@ 64K as default, the page cross handling assumes minimum page size of 4k. */ - .machine power7 -EALIGN (FUNC_NAME, 4, 0) + .machine power8 +ENTRY_TOCLESS (FUNC_NAME, 4) li r0,0 /* Doubleword with null chars to use with cmpb. */ @@ -112,7 +120,7 @@ L(pagecross): ldu r8, 8(r7) L(loop_before): - /* Save the two doublewords readed from source and align the source + /* Save the two doublewords read from source and align the source to 16 bytes for the loop. */ mr r11,r3 std r12,0(r11) @@ -121,7 +129,150 @@ L(loop_before): rldicl r9,r4,0,60 subf r7,r9,r7 subf r11,r9,r11 - b L(loop_start) + /* Source is adjusted to 16B alignment and destination r11 is + also moved based on that adjustment. Now check if r11 is + also 16B aligned to move to vectorized loop. */ + andi. r6, r11, 0xF + bne L(loop_start) + + /* Prepare for the loop. */ + subf r4, r9, r4 /* Adjust r4 based on alignment. */ + li r7, 16 /* Load required offsets. */ + li r8, 32 + li r9, 48 + vspltisb v0, 0 + addi r4, r4, 16 + /* Are we 64-byte aligned? If so, jump to the vectorized loop. + Else copy 16B till r4 is 64B aligned. */ + andi. r6, r4, 63 + beq L(qw_loop) + + lvx v6, 0, r4 /* Load 16 bytes from memory. */ + vcmpequb. v5, v0, v6 /* Check for null. */ + bne cr6, L(qw_done) + stvx v6, 0, r11 /* Store 16 bytes. */ + addi r4, r4, 16 /* Increment the address. */ + addi r11, r11, 16 + andi. r6, r4, 63 + beq L(qw_loop) + + lvx v6, 0, r4 + vcmpequb. v5, v0, v6 + bne cr6, L(qw_done) + stvx v6, 0, r11 + addi r4, r4, 16 + addi r11, r11, 16 + andi. r6, r4, 63 + beq L(qw_loop) + + lvx v6, 0, r4 + vcmpequb. v5, v0, v6 + bne cr6, L(qw_done) + stvx v6, 0, r11 + addi r4, r4, 16 + addi r11, r11, 16 + + .align 4 +L(qw_loop): + lvx v1, r4, r0 /* Load 4 quadwords. */ + lvx v2, r4, r7 + lvx v3, r4, r8 + lvx v4, r4, r9 + vminub v5, v1, v2 /* Compare and merge into one VR for speed. */ + vminub v8, v3, v4 + vminub v7, v5, v8 + vcmpequb. v7, v7, v0 /* Check for NULLs. */ + bne cr6, L(qw_loop_done) + stvx v1, r11, r0 /* Store 4 quadwords. */ + stvx v2, r11, r7 + stvx v3, r11, r8 + stvx v4, r11, r9 + addi r4, r4, 64 /* Adjust address for the next iteration. */ + addi r11, r11, 64 /* Adjust address for the next iteration. */ + + lvx v1, r4, r0 /* Load 4 quadwords. */ + lvx v2, r4, r7 + lvx v3, r4, r8 + lvx v4, r4, r9 + vminub v5, v1, v2 /* Compare and merge into one VR for speed. */ + vminub v8, v3, v4 + vminub v7, v5, v8 + vcmpequb. v7, v7, v0 /* Check for NULLs. */ + bne cr6, L(qw_loop_done) + stvx v1, r11, r0 /* Store 4 quadwords. */ + stvx v2, r11, r7 + stvx v3, r11, r8 + stvx v4, r11, r9 + addi r4, r4, 64 /* Adjust address for the next iteration. */ + addi r11, r11, 64 /* Adjust address for the next iteration. */ + + lvx v1, r4, r0 /* Load 4 quadwords. */ + lvx v2, r4, r7 + lvx v3, r4, r8 + lvx v4, r4, r9 + vminub v5, v1, v2 /* Compare and merge into one VR for speed. */ + vminub v8, v3, v4 + vminub v7, v5, v8 + vcmpequb. v7, v7, v0 /* Check for NULLs. */ + bne cr6, L(qw_loop_done) + stvx v1, r11, r0 /* Store 4 quadwords. */ + stvx v2, r11, r7 + stvx v3, r11, r8 + stvx v4, r11, r9 + addi r4, r4, 64 /* Adjust address for the next iteration. */ + addi r11, r11, 64 /* Adjust address for the next iteration. */ + b L(qw_loop) + + .align 4 +L(qw_loop_done): + /* Null found in one of the 4 loads. */ + vcmpequb. v7, v1, v0 + vor v6, v1, v1 + bne cr6, L(qw_done) + /* Not on the first 16B, So store it. */ + stvx v1, r11, r0 + addi r4, r4, 16 + addi r11, r11, 16 + vcmpequb. v7, v2, v0 + vor v6, v2, v2 + bne cr6, L(qw_done) + /* Not on the second 16B, So store it. */ + stvx v2, r11, r0 + addi r4, r4, 16 + addi r11, r11, 16 + vcmpequb. v7, v3, v0 + vor v6, v3, v3 + bne cr6, L(qw_done) + /* Not on the third 16B, So store it. */ + stvx v6, r11, r0 + addi r4, r4, 16 + addi r11, r11, 16 + vor v6, v4, v4 + + .align 4 +L(qw_done): + mr r7, r4 + /* Move the result to GPR. */ +#ifdef __LITTLE_ENDIAN__ + vsldoi v4, v6, v0, 8 + mfvrd r12, v4 +#else + mfvrd r12, v6 +#endif + /* Check for null in the first 8 bytes. */ + cmpb r10, r12, r0 + cmpdi cr6, r10, 0 + bne cr6, L(done2) + /* Null found in second doubleword. */ +#ifdef __LITTLE_ENDIAN__ + mfvrd r6, v6 +#else + vsldoi v6, v6, v0, 8 + mfvrd r6, v6 +#endif + cmpb r10, r6, r0 + addi r7, r7, 8 + b L(done2) .align 5 L(loop): |