diff --git a/gcc/config/rs6000/rs6000-protos.h b/gcc/config/rs6000/rs6000-protos.h
index 3ea01023609..bc7f6ff64ef 100644
--- a/gcc/config/rs6000/rs6000-protos.h
+++ b/gcc/config/rs6000/rs6000-protos.h
@@ -35,6 +35,7 @@ extern bool xxspltib_constant_p (rtx, machine_mode, int *, int *);
 extern int vspltis_shifted (rtx);
 extern HOST_WIDE_INT const_vector_elt_as_int (rtx, unsigned int);
 extern bool macho_lo_sum_memory_operand (rtx, machine_mode);
+extern int rotate_from_leading_zeros_const (unsigned HOST_WIDE_INT, int);
 extern int num_insns_constant (rtx, machine_mode);
 extern int small_data_operand (rtx, machine_mode);
 extern bool mem_operand_gpr (rtx, machine_mode);
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 3ff16b8ae04..9c0996603d0 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -14861,6 +14861,35 @@ rs6000_reverse_condition (machine_mode mode, enum rtx_code code)
     return reverse_condition (code);
 }
 
+/* Check if C can be rotated from an immediate which contains leading
+   zeros at least CLZ.
+
+   Return the number by which C can be rotated from the immediate.
+   Return -1 if C can not be rotated as from.  */
+
+int
+rotate_from_leading_zeros_const (unsigned HOST_WIDE_INT c, int clz)
+{
+  /* case. 0..0xxx: already at least clz zeros.  */
+  int lz = clz_hwi (c);
+  if (lz >= clz)
+    return 0;
+
+  /* case a. 0..0xxx0..0: at least clz zeros.  */
+  int tz = ctz_hwi (c);
+  if (lz + tz >= clz)
+    return tz;
+
+  /* xx0..0xx: rotate enough bits firstly, then check case a.  */
+  const int rot_bits = HOST_BITS_PER_WIDE_INT - clz + 1;
+  unsigned HOST_WIDE_INT rc = (c >> rot_bits) | (c << (clz - 1));
+  tz = ctz_hwi (rc);
+  if (clz_hwi (rc) + tz >= clz)
+    return tz + rot_bits;
+
+  return -1;
+}
+
 /* Generate a compare for CODE.  Return a brand-new rtx that
    represents the result of the compare.  */
 
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 1367a2cb779..603781b29aa 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -7720,6 +7720,59 @@ (define_insn "*movsi_from_df"
   "xscvdpsp %x0,%x1"
   [(set_attr "type" "fp")])
 
+
+(define_code_iterator eqne [eq ne])
+
+;; "i == C" ==> "rotl(i,N) == rotl(C,N)"
+(define_insn_and_split "*rotate_on_cmpdi"
+  [(set (pc)
+     (if_then_else (eqne (match_operand:DI 1 "gpc_reg_operand" "r")
+			 (match_operand:DI 2 "const_int_operand" "n"))
+			 (label_ref (match_operand 0 ""))
+		   (pc)))]
+  "TARGET_POWERPC64 && !reload_completed && can_create_pseudo_p ()
+   && num_insns_constant (operands[2], DImode) > 1
+   && (rotate_from_leading_zeros_const (~UINTVAL (operands[2]), 49) > 0
+       || rotate_from_leading_zeros_const (UINTVAL (operands[2]), 48) > 0)"
+   "#"
+   "&& 1"
+  [(pc)]
+{
+  rtx cnd = XEXP (SET_SRC (single_set (curr_insn)), 0);
+  bool ne = GET_CODE (cnd) == NE;
+
+  bool sgn = false;
+  unsigned HOST_WIDE_INT C = INTVAL (operands[2]);
+  int rot = rotate_from_leading_zeros_const (C, 48);
+  if (rot < 0)
+  {
+     sgn = true;
+     rot = rotate_from_leading_zeros_const (~C, 49);
+  }
+  rtx n = GEN_INT (HOST_BITS_PER_WIDE_INT - rot);
+
+  /* i' = rotl (i, n) */
+  rtx op0 = gen_reg_rtx (DImode);
+  emit_insn (gen_rtx_SET (op0, gen_rtx_ROTATE (DImode, operands[1], n)));
+
+  /* C' = rotl (C, n) */
+  rtx op1 = GEN_INT ((C << INTVAL (n)) | (C >> rot));
+
+  /* i' ==  C' */
+  machine_mode comp_mode = sgn ? CCmode : CCUNSmode;
+  rtx cc = gen_reg_rtx (comp_mode);
+  emit_insn (gen_rtx_SET (cc, gen_rtx_COMPARE (comp_mode, op0, op1)));
+
+  rtx cmp = ne ? gen_rtx_NE (CCmode, cc, const0_rtx)
+	       : gen_rtx_EQ (CCmode, cc, const0_rtx);
+  rtx loc_ref = gen_rtx_LABEL_REF (VOIDmode, operands[0]);
+  emit_jump_insn (gen_rtx_SET (pc_rtx,
+			       gen_rtx_IF_THEN_ELSE (VOIDmode, cmp,
+						     loc_ref, pc_rtx)));
+  DONE;
+}
+)
+
 ;; Split a load of a large constant into the appropriate two-insn
 ;; sequence.
 
@@ -13426,7 +13479,6 @@ (define_expand "@ctr<mode>"
 ;; rs6000_legitimate_combined_insn prevents combine creating any of
 ;; the ctr<mode> insns.
 
-(define_code_iterator eqne [eq ne])
 (define_code_attr bd [(eq "bdz") (ne "bdnz")])
 (define_code_attr bd_neg [(eq "bdnz") (ne "bdz")])
 
diff --git a/gcc/testsuite/gcc.target/powerpc/pr103743.c b/gcc/testsuite/gcc.target/powerpc/pr103743.c
new file mode 100644
index 00000000000..e18833685fb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr103743.c
@@ -0,0 +1,52 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler-times "cmpldi" 10  } } */
+/* { dg-final { scan-assembler-times "cmpdi" 4  } } */
+/* { dg-final { scan-assembler-times "rotldi" 14  } } */
+
+int foo (int a);
+
+int __attribute__ ((noinline)) udi_fun (unsigned long long in)
+{
+  if (in == (0x8642000000000000ULL))
+    return foo (1);
+  if (in == (0x7642000000000000ULL))
+    return foo (12);
+  if (in == (0x8000000000000000ULL))
+    return foo (32);
+  if (in == (0x8000000000000001ULL))
+    return foo (33);
+  if (in == (0x8642FFFFFFFFFFFFULL))
+    return foo (46);
+  if (in == (0x7642FFFFFFFFFFFFULL))
+    return foo (51);
+  if (in == (0x7567000000ULL))
+    return foo (9);
+  if (in == (0xFFF8567FFFFFFFFFULL))
+    return foo (19);
+
+  return 0;
+}
+
+int __attribute__ ((noinline)) di_fun (long long in)
+{
+  if (in == (0x8642000000000000LL))
+    return foo (1);
+  if (in == (0x7642000000000000LL))
+    return foo (12);
+  if (in == (0x8000000000000000LL))
+    return foo (32);
+  if (in == (0x8000000000000001LL))
+    return foo (33);
+  if (in == (0x8642FFFFFFFFFFFFLL))
+    return foo (46);
+  if (in == (0x7642FFFFFFFFFFFFLL))
+    return foo (51);
+  if (in == (0x7567000000LL))
+    return foo (9);
+  if (in == (0xFFF8567FFFFFFFFFLL))
+    return foo (19);
+
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/powerpc/pr103743_1.c b/gcc/testsuite/gcc.target/powerpc/pr103743_1.c
new file mode 100644
index 00000000000..2c08c56714a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr103743_1.c
@@ -0,0 +1,95 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -std=c99" } */
+
+int
+foo (int a)
+{
+  return a + 6;
+}
+
+int __attribute__ ((noinline)) udi_fun (unsigned long long in)
+{
+  if (in == (0x8642000000000000ULL))
+    return foo (1);
+  if (in == (0x7642000000000000ULL))
+    return foo (12);
+  if (in == (0x8000000000000000ULL))
+    return foo (32);
+  if (in == (0x8000000000000001ULL))
+    return foo (33);
+  if (in == (0x8642FFFFFFFFFFFFULL))
+    return foo (46);
+  if (in == (0x7642FFFFFFFFFFFFULL))
+    return foo (51);
+  if (in == (0x7567000000ULL))
+    return foo (9);
+  if (in == (0xFFF8567FFFFFFFFFULL))
+    return foo (19);
+  
+  return 0;
+}
+
+int __attribute__ ((noinline)) di_fun (long long in)
+{
+  if (in == (0x8642000000000000LL))
+    return foo (1);
+  if (in == (0x7642000000000000LL))
+    return foo (12);
+  if (in == (0x8000000000000000LL))
+    return foo (32);
+  if (in == (0x8000000000000001LL))
+    return foo (33);
+  if (in == (0x8642FFFFFFFFFFFFLL))
+    return foo (46);
+  if (in == (0x7642FFFFFFFFFFFFLL))
+    return foo (51);
+  return 0;
+}
+
+int
+main ()
+{
+  int e = 0;
+  if (udi_fun (6) != 0)
+    e++;
+  if (udi_fun (0x8642000000000000ULL) != foo (1))
+    e++;
+  if (udi_fun (0x7642000000000000ULL) != foo (12))
+    e++;
+  if (udi_fun (0x8000000000000000ULL) != foo (32))
+    e++;
+  if (udi_fun (0x8000000000000001ULL) != foo (33))
+    e++;
+  if (udi_fun (0x8642FFFFFFFFFFFFULL) != foo (46))
+    e++;
+  if (udi_fun (0x7642FFFFFFFFFFFFULL) != foo (51))
+    e++;
+  if (udi_fun (0x7567000000ULL) != foo (9))
+    e++;
+  if (udi_fun (0xFFF8567FFFFFFFFFULL) != foo (19))
+    e++;
+
+  if (di_fun (6) != 0)
+    e++;
+  if (di_fun (0x8642000000000000LL) != foo (1))
+    e++;
+  if (di_fun (0x7642000000000000LL) != foo (12))
+    e++;
+  if (di_fun (0x8000000000000000LL) != foo (32))
+    e++;
+  if (di_fun (0x8000000000000001LL) != foo (33))
+    e++;
+  if (di_fun (0x8642FFFFFFFFFFFFLL) != foo (46))
+    e++;
+  if (di_fun (0x7642FFFFFFFFFFFFLL) != foo (51))
+    e++;
+  if (udi_fun (0x7567000000LL) != foo (9))
+    e++;
+  if (udi_fun (0xFFF8567FFFFFFFFFLL) != foo (19))
+    e++;
+
+  if (e)
+    __builtin_abort ();
+  return 0;
+}
+
