Benjamin Kramer 0ef0e2e6d0 LoopVectorize: Emit reductions as log2(vectorsize) shuffles + vector ops instead of scalar operations. ... For example on x86 with SSE4.2 a <8 x i8> add reduction becomes movdqa %xmm0, %xmm1 movhlps %xmm1, %xmm1 ## xmm1 = xmm1[1,1] paddw %xmm0, %xmm1 pshufd $1, %xmm1, %xmm0 ## xmm0 = xmm1[1,0,0,0] paddw %xmm1, %xmm0 phaddw %xmm0, %xmm0 pextrb $0, %xmm0, %edx instead of pextrb $2, %xmm0, %esi pextrb $0, %xmm0, %edx addb %sil, %dl pextrb $4, %xmm0, %esi addb %dl, %sil pextrb $6, %xmm0, %edx addb %sil, %dl pextrb $8, %xmm0, %esi addb %dl, %sil pextrb $10, %xmm0, %edi pextrb $14, %xmm0, %edx addb %sil, %dil pextrb $12, %xmm0, %esi addb %dil, %sil addb %sil, %dl git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170439 91177308-0d34-0410-b5e6-96231b3b80d8		2012-12-18 18:40:20 +00:00
..
BBVectorize.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
CMakeLists.txt	Add a loop vectorizer.	2012-10-17 18:25:06 +00:00
LLVMBuild.txt
LoopVectorize.cpp	LoopVectorize: Emit reductions as log2(vectorsize) shuffles + vector ops instead of scalar operations.	2012-12-18 18:40:20 +00:00
LoopVectorize.h	Teach the cost model about the optimization in r169904: Truncation of induction variables costs the same as scalar trunc.	2012-12-13 00:21:03 +00:00
Makefile
Vectorize.cpp	LoopVectorizer: Use the "optsize" attribute to decide if we are allowed to increase the function size.	2012-12-12 19:29:45 +00:00