diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/alpha/lib/ev67-strrchr.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/alpha/lib/ev67-strrchr.S | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/ANDROID_3.4.5/arch/alpha/lib/ev67-strrchr.S b/ANDROID_3.4.5/arch/alpha/lib/ev67-strrchr.S deleted file mode 100644 index dd0d8c6b..00000000 --- a/ANDROID_3.4.5/arch/alpha/lib/ev67-strrchr.S +++ /dev/null @@ -1,109 +0,0 @@ -/* - * arch/alpha/lib/ev67-strrchr.S - * 21264 version by Rick Gorton <rick.gorton@alpha-processor.com> - * - * Finds length of a 0-terminated string. Optimized for the - * Alpha architecture: - * - * - memory accessed as aligned quadwords only - * - uses bcmpge to compare 8 bytes in parallel - * - * Much of the information about 21264 scheduling/coding comes from: - * Compiler Writer's Guide for the Alpha 21264 - * abbreviated as 'CWG' in other comments here - * ftp.digital.com/pub/Digital/info/semiconductor/literature/dsc-library.html - * Scheduling notation: - * E - either cluster - * U - upper subcluster; U0 - subcluster U0; U1 - subcluster U1 - * L - lower subcluster; L0 - subcluster L0; L1 - subcluster L1 - */ - - -#include <asm/regdef.h> - - .set noreorder - .set noat - - .align 4 - .ent strrchr - .globl strrchr -strrchr: - .frame sp, 0, ra - .prologue 0 - - and a1, 0xff, t2 # E : 00000000000000ch - insbl a1, 1, t4 # U : 000000000000ch00 - insbl a1, 2, t5 # U : 0000000000ch0000 - ldq_u t0, 0(a0) # L : load first quadword Latency=3 - - mov zero, t6 # E : t6 is last match aligned addr - or t2, t4, a1 # E : 000000000000chch - sll t5, 8, t3 # U : 00000000ch000000 - mov zero, t8 # E : t8 is last match byte compare mask - - andnot a0, 7, v0 # E : align source addr - or t5, t3, t3 # E : 00000000chch0000 - sll a1, 32, t2 # U : 0000chch00000000 - sll a1, 48, t4 # U : chch000000000000 - - or t4, a1, a1 # E : chch00000000chch - or t2, t3, t2 # E : 0000chchchch0000 - or a1, t2, a1 # E : chchchchchchchch - lda t5, -1 # E : build garbage mask - - cmpbge zero, t0, t1 # E : bits set iff byte == zero - mskqh t5, a0, t4 # E : Complete garbage mask - xor t0, a1, t2 # E : make bytes == c zero - cmpbge zero, t4, t4 # E : bits set iff byte is garbage - - cmpbge zero, t2, t3 # E : bits set iff byte == c - andnot t1, t4, t1 # E : clear garbage from null test - andnot t3, t4, t3 # E : clear garbage from char test - bne t1, $eos # U : did we already hit the terminator? - - /* Character search main loop */ -$loop: - ldq t0, 8(v0) # L : load next quadword - cmovne t3, v0, t6 # E : save previous comparisons match - nop # : Latency=2, extra map slot (keep nop with cmov) - nop - - cmovne t3, t3, t8 # E : Latency=2, extra map slot - nop # : keep with cmovne - addq v0, 8, v0 # E : - xor t0, a1, t2 # E : - - cmpbge zero, t0, t1 # E : bits set iff byte == zero - cmpbge zero, t2, t3 # E : bits set iff byte == c - beq t1, $loop # U : if we havnt seen a null, loop - nop - - /* Mask out character matches after terminator */ -$eos: - negq t1, t4 # E : isolate first null byte match - and t1, t4, t4 # E : - subq t4, 1, t5 # E : build a mask of the bytes up to... - or t4, t5, t4 # E : ... and including the null - - and t3, t4, t3 # E : mask out char matches after null - cmovne t3, t3, t8 # E : save it, if match found Latency=2, extra map slot - nop # : Keep with cmovne - nop - - cmovne t3, v0, t6 # E : - nop # : Keep with cmovne - /* Locate the address of the last matched character */ - ctlz t8, t2 # U0 : Latency=3 (0x40 for t8=0) - nop - - cmoveq t8, 0x3f, t2 # E : Compensate for case when no match is seen - nop # E : hide the cmov latency (2) behind ctlz latency - lda t5, 0x3f($31) # E : - subq t5, t2, t5 # E : Normalize leading zero count - - addq t6, t5, v0 # E : and add to quadword address - ret # L0 : Latency=3 - nop - nop - - .end strrchr |