[LLVMdev] strlen in fast-isel

[reed kotler]

It seems that fast-isel for intel does not handle strlen. It's a general 
problem in fast-isel .


~/llvmw/build/Deb~/llvmw/build/Debug+Asserts/bin/clang -O0  -mllvm 
-fast-isel-verbose -mllvm -fast-isel strlen1.c
strlen1.c:12:3: warning: implicitly declaring library function 'printf' with
       type 'int (const char *, ...)'
   printf("%i\n", len);
   ^
strlen1.c:12:3: note: include the header <stdio.h> or explicitly provide a
       declaration for 'printf'
FastISel missed call:   %call = call i64 @strlen(i8* %0) #3
1 warning generated.

#include <string.h>

char *hello = "hello";
int len;

void foo() {
   len = strlen(hello);
}

int main() {
   foo();
   printf("%i\n", len);
}