Chris Lattner 29e14edc8d implement enough of the memset inference algorithm to recognize and insert ... memsets. This is still missing one important validity check, but this is enough to compile stuff like this: void test0(std::vector<char> &X) { for (std::vector<char>::iterator I = X.begin(), E = X.end(); I != E; ++I) *I = 0; } void test1(std::vector<int> &X) { for (long i = 0, e = X.size(); i != e; ++i) X[i] = 0x01010101; } With: $ clang t.cpp -S -o - -O2 -emit-llvm | opt -loop-idiom | opt -O3 | llc to: __Z5test0RSt6vectorIcSaIcEE: ## @_Z5test0RSt6vectorIcSaIcEE ## BB#0: ## %entry subq $8, %rsp movq (%rdi), %rax movq 8(%rdi), %rsi cmpq %rsi, %rax je LBB0_2 ## BB#1: ## %bb.nph subq %rax, %rsi movq %rax, %rdi callq ___bzero LBB0_2: ## %for.end addq $8, %rsp ret ... __Z5test1RSt6vectorIiSaIiEE: ## @_Z5test1RSt6vectorIiSaIiEE ## BB#0: ## %entry subq $8, %rsp movq (%rdi), %rax movq 8(%rdi), %rdx subq %rax, %rdx cmpq $4, %rdx jb LBB1_2 ## BB#1: ## %for.body.preheader andq $-4, %rdx movl $1, %esi movq %rax, %rdi callq _memset LBB1_2: ## %for.end addq $8, %rsp ret llvm-svn: 122573		2010-12-26 23:42:51 +00:00
clang	Add support for GNU runtime property set / get structure functions. Minor refactoring of Mac runtime (returns the same function for both, as the Mac runtimes currently only provide a single entry point for setting and getting struct properties, although this will presumably be fixed at some point).	2010-12-26 22:13:16 +00:00
compiler-rt	license change	2010-11-16 22:13:33 +00:00
debuginfo-tests	Zap white spaces, test commit email.	2010-11-10 18:11:11 +00:00
libcxx	Effort to reduce the number of exported symbols	2010-12-17 14:46:43 +00:00
lldb	Uncomment the two failed 'expression' commands regarding fully qualified namespace variables.	2010-12-23 23:26:05 +00:00
llvm	implement enough of the memset inference algorithm to recognize and insert	2010-12-26 23:42:51 +00:00