diff options
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power7/strstr.S | 22 |
2 files changed, 19 insertions, 7 deletions
@@ -1,3 +1,7 @@ +2015-08-25 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> + + * sysdeps/powerpc/powerpc64/power7/strstr.S: Handle worst case. + 2015-08-25 H.J. Lu <hongjiu.lu@intel.com> * sysdeps/x86_64/strlen.S: Replace %xmm[8-12] with %xmm[0-4]. diff --git a/sysdeps/powerpc/powerpc64/power7/strstr.S b/sysdeps/powerpc/powerpc64/power7/strstr.S index bfb0c49..fb3c810 100644 --- a/sysdeps/powerpc/powerpc64/power7/strstr.S +++ b/sysdeps/powerpc/powerpc64/power7/strstr.S @@ -23,6 +23,8 @@ /* The performance gain is obtained using aligned memory access, load * doubleword and usage of cmpb instruction for quicker comparison. */ +#define ITERATIONS 64 + #ifndef STRLEN /* For builds with no IFUNC support, local calls should be made to internal GLIBC symbol (created by libc_hidden_builtin_def). */ @@ -62,6 +64,8 @@ EALIGN (strstr, 4, 0) cfi_offset(r30, -16) std r29, -24(r1) /* Save callers register r29. */ cfi_offset(r29, -24) + std r28, -32(r1) /* Save callers register r28. */ + cfi_offset(r28, -32) std r0, 16(r1) /* Store the link register. */ cfi_offset(lr, 16) stdu r1, -FRAMESIZE(r1) /* Create the stack frame. */ @@ -69,7 +73,6 @@ EALIGN (strstr, 4, 0) dcbt 0, r3 dcbt 0, r4 - cmpdi cr7, r3, 0 beq cr7, L(retnull) cmpdi cr7, r4, 0 @@ -84,10 +87,6 @@ EALIGN (strstr, 4, 0) cmpdi cr7, r3, 0 /* If search str is null. */ beq cr7, L(ret_r3) - /* Call __strstr_ppc if needle len > 2048 */ - cmpdi cr7, r3, 2048 - bgt cr7, L(default) - mr r31, r3 mr r4, r3 mr r3, r29 @@ -105,7 +104,8 @@ EALIGN (strstr, 4, 0) /* If first char of search str is not present. */ cmpdi cr7, r3, 0 ble cr7, L(end) - + /* Reg r28 is used to count the number of iterations. */ + li r28, 0 rldicl r8, r3, 0, 52 /* Page cross check. */ cmpldi cr7, r8, 4096-16 bgt cr7, L(bytebybyte) @@ -324,6 +324,10 @@ L(return4): .align 4 L(begin): mr r3, r8 + /* When our iterations exceed ITERATIONS,fall back to default. */ + addi r28, r28, 1 + cmpdi cr7, r28, ITERATIONS + beq cr7, L(default) lbz r4, 0(r30) bl STRCHR nop @@ -423,6 +427,10 @@ L(nextbyte): cmpdi cr7, r9, -1 beq cr7, L(end) addi r3, r4, 1 + /* When our iterations exceed ITERATIONS,fall back to default. */ + addi r28, r28, 1 + cmpdi cr7, r28, ITERATIONS + beq cr7, L(default) lbz r4, 0(r30) bl STRCHR nop @@ -490,7 +498,6 @@ L(retnull): .align 4 L(default): - mr r3, r29 mr r4, r30 bl __strstr_ppc nop @@ -500,6 +507,7 @@ L(end): addi r1, r1, FRAMESIZE /* Restore stack pointer. */ cfi_adjust_cfa_offset(-FRAMESIZE) ld r0, 16(r1) /* Restore the saved link register. */ + ld r28, -32(r1) /* Restore callers save register r28. */ ld r29, -24(r1) /* Restore callers save register r29. */ ld r30, -16(r1) /* Restore callers save register r30. */ ld r31, -8(r1) /* Restore callers save register r31. */ |