[LLVMbugs] [Bug 22277] New: fast-isel cannot handle strlen

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Jan 20 14:48:45 PST 2015


            Bug ID: 22277
           Summary: fast-isel cannot handle strlen
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rkotler at mips.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

~/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() {
  printf("%i\n", len);

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