[LLVMbugs] [Bug 22571] New: Crash in instruction selection when using _addcarry_u64 intrinsic

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22571

            Bug ID: 22571
           Summary: Crash in instruction selection when using
                    _addcarry_u64 intrinsic
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: sneves at dei.uc.pt
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following program causes clang (svn228909) to crash during instruction
selection (x86_64 target, -O1 and higher) for add3 but not add2:

#include <immintrin.h>

typedef unsigned long long u64;

void add2(u64 x[4], const u64 y[4]) {
  unsigned char cy = 0;
  for(int i = 0; i < 4; ++i) {
    cy = _addcarry_u64(cy, x[i], y[i], &x[i]);
  }
}

void add3(u64 z[4], const u64 x[4], const u64 y[4]) {
  unsigned char cy = 0;
  for(int i = 0; i < 4; ++i) {
    cy = _addcarry_u64(cy, x[i], y[i], &z[i]);
  }
}

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