diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/alpha/lib/ev67-strchr.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/alpha/lib/ev67-strchr.S | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/ANDROID_3.4.5/arch/alpha/lib/ev67-strchr.S b/ANDROID_3.4.5/arch/alpha/lib/ev67-strchr.S deleted file mode 100644 index fbb7b4ff..00000000 --- a/ANDROID_3.4.5/arch/alpha/lib/ev67-strchr.S +++ /dev/null @@ -1,88 +0,0 @@ -/* - * arch/alpha/lib/ev67-strchr.S - * 21264 version contributed by Rick Gorton <rick.gorton@alpha-processor.com> - * - * Return the address of a given character within a null-terminated - * string, or null if it is not found. - * - * 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 - * Try not to change the actual algorithm if possible for consistency. - */ - -#include <asm/regdef.h> - - .set noreorder - .set noat - - .align 4 - .globl strchr - .ent strchr -strchr: - .frame sp, 0, ra - .prologue 0 - - ldq_u t0, 0(a0) # L : load first quadword Latency=3 - and a1, 0xff, t3 # E : 00000000000000ch - insbl a1, 1, t5 # U : 000000000000ch00 - insbl a1, 7, a2 # U : ch00000000000000 - - insbl t3, 6, a3 # U : 00ch000000000000 - or t5, t3, a1 # E : 000000000000chch - andnot a0, 7, v0 # E : align our loop pointer - lda t4, -1 # E : build garbage mask - - mskqh t4, a0, t4 # U : only want relevant part of first quad - or a2, a3, a2 # E : chch000000000000 - inswl a1, 2, t5 # E : 00000000chch0000 - inswl a1, 4, a3 # E : 0000chch00000000 - - or a1, a2, a1 # E : chch00000000chch - or a3, t5, t5 # E : 0000chchchch0000 - cmpbge zero, t0, t2 # E : bits set iff byte == zero - cmpbge zero, t4, t4 # E : bits set iff byte is garbage - - /* This quad is _very_ serialized. Lots of stalling happens */ - or t5, a1, a1 # E : chchchchchchchch - xor t0, a1, t1 # E : make bytes == c zero - cmpbge zero, t1, t3 # E : bits set iff byte == c - or t2, t3, t0 # E : bits set iff char match or zero match - - andnot t0, t4, t0 # E : clear garbage bits - cttz t0, a2 # U0 : speculative (in case we get a match) - nop # E : - bne t0, $found # U : - - /* - * Yuk. This loop is going to stall like crazy waiting for the - * data to be loaded. Not much can be done about it unless it's - * unrolled multiple times - is that safe to do in kernel space? - * Or would exception handling recovery code do the trick here? - */ -$loop: ldq t0, 8(v0) # L : Latency=3 - addq v0, 8, v0 # E : - xor t0, a1, t1 # E : - cmpbge zero, t0, t2 # E : bits set iff byte == 0 - - cmpbge zero, t1, t3 # E : bits set iff byte == c - or t2, t3, t0 # E : - cttz t3, a2 # U0 : speculative (in case we get a match) - beq t0, $loop # U : - -$found: negq t0, t1 # E : clear all but least set bit - and t0, t1, t0 # E : - and t0, t3, t1 # E : bit set iff byte was the char - addq v0, a2, v0 # E : Add in the bit number from above - - cmoveq t1, $31, v0 # E : Two mapping slots, latency = 2 - nop - nop - ret # L0 : - - .end strchr |