Index: lib/Target/RISCV/RISCVISelLowering.h
===================================================================
--- lib/Target/RISCV/RISCVISelLowering.h
+++ lib/Target/RISCV/RISCVISelLowering.h
@@ -98,6 +98,10 @@
   EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
                          EVT VT) const override;
 
+  bool convertSetCCLogicToBitwiseLogic(EVT VT) const override {
+    return VT.isScalarInteger();
+  }
+
   bool shouldInsertFencesForAtomic(const Instruction *I) const override {
     return isa<LoadInst>(I) || isa<StoreInst>(I);
   }
Index: test/CodeGen/RISCV/setcc-logic.ll
===================================================================
--- /dev/null
+++ test/CodeGen/RISCV/setcc-logic.ll
@@ -0,0 +1,130 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
+; RUN:   | FileCheck %s -check-prefix=RV32I
+; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
+; RUN:   | FileCheck %s -check-prefix=RV64I
+
+define i1 @or_icmps_const_1bit_diff(i64 %x) nounwind {
+; RV32I-LABEL: or_icmps_const_1bit_diff:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    addi a2, a0, -13
+; RV32I-NEXT:    sltu a0, a2, a0
+; RV32I-NEXT:    add a0, a1, a0
+; RV32I-NEXT:    addi a0, a0, -1
+; RV32I-NEXT:    andi a1, a2, -5
+; RV32I-NEXT:    or a0, a1, a0
+; RV32I-NEXT:    seqz a0, a0
+; RV32I-NEXT:    ret
+;
+; RV64I-LABEL: or_icmps_const_1bit_diff:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    addi a0, a0, -13
+; RV64I-NEXT:    andi a0, a0, -5
+; RV64I-NEXT:    seqz a0, a0
+; RV64I-NEXT:    ret
+  %a = icmp eq i64 %x, 17
+  %b = icmp eq i64 %x, 13
+  %r = or i1 %a, %b
+  ret i1 %r
+}
+
+define i1 @and_icmps_const_1bit_diff(i32 %x) nounwind {
+; RV32I-LABEL: and_icmps_const_1bit_diff:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    addi a0, a0, -44
+; RV32I-NEXT:    andi a0, a0, -17
+; RV32I-NEXT:    snez a0, a0
+; RV32I-NEXT:    ret
+;
+; RV64I-LABEL: and_icmps_const_1bit_diff:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    addi a0, a0, -44
+; RV64I-NEXT:    addi a1, zero, 1
+; RV64I-NEXT:    slli a1, a1, 32
+; RV64I-NEXT:    addi a1, a1, -17
+; RV64I-NEXT:    and a0, a0, a1
+; RV64I-NEXT:    snez a0, a0
+; RV64I-NEXT:    ret
+  %a = icmp ne i32 %x, 44
+  %b = icmp ne i32 %x, 60
+  %r = and i1 %a, %b
+  ret i1 %r
+}
+
+define i1 @and_icmps_const_not1bit_diff(i32 %x) nounwind {
+; RV32I-LABEL: and_icmps_const_not1bit_diff:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    addi a1, zero, 44
+; RV32I-NEXT:    xor a1, a0, a1
+; RV32I-NEXT:    addi a2, zero, 92
+; RV32I-NEXT:    xor a0, a0, a2
+; RV32I-NEXT:    snez a0, a0
+; RV32I-NEXT:    snez a1, a1
+; RV32I-NEXT:    and a0, a1, a0
+; RV32I-NEXT:    ret
+;
+; RV64I-LABEL: and_icmps_const_not1bit_diff:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    slli a0, a0, 32
+; RV64I-NEXT:    srli a0, a0, 32
+; RV64I-NEXT:    addi a1, zero, 44
+; RV64I-NEXT:    xor a1, a0, a1
+; RV64I-NEXT:    addi a2, zero, 92
+; RV64I-NEXT:    xor a0, a0, a2
+; RV64I-NEXT:    snez a0, a0
+; RV64I-NEXT:    snez a1, a1
+; RV64I-NEXT:    and a0, a1, a0
+; RV64I-NEXT:    ret
+  %a = icmp ne i32 %x, 44
+  %b = icmp ne i32 %x, 92
+  %r = and i1 %a, %b
+  ret i1 %r
+}
+
+define i1 @and_icmp_eq(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
+; RV32I-LABEL: and_icmp_eq:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    xor a2, a2, a3
+; RV32I-NEXT:    xor a0, a0, a1
+; RV32I-NEXT:    or a0, a0, a2
+; RV32I-NEXT:    seqz a0, a0
+; RV32I-NEXT:    ret
+;
+; RV64I-LABEL: and_icmp_eq:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    xor a2, a2, a3
+; RV64I-NEXT:    xor a0, a0, a1
+; RV64I-NEXT:    or a0, a0, a2
+; RV64I-NEXT:    slli a0, a0, 32
+; RV64I-NEXT:    srli a0, a0, 32
+; RV64I-NEXT:    seqz a0, a0
+; RV64I-NEXT:    ret
+  %cmp1 = icmp eq i32 %a, %b
+  %cmp2 = icmp eq i32 %c, %d
+  %and = and i1 %cmp1, %cmp2
+  ret i1 %and
+}
+
+define i1 @or_icmp_ne(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
+; RV32I-LABEL: or_icmp_ne:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    xor a2, a2, a3
+; RV32I-NEXT:    xor a0, a0, a1
+; RV32I-NEXT:    or a0, a0, a2
+; RV32I-NEXT:    snez a0, a0
+; RV32I-NEXT:    ret
+;
+; RV64I-LABEL: or_icmp_ne:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    xor a2, a2, a3
+; RV64I-NEXT:    xor a0, a0, a1
+; RV64I-NEXT:    or a0, a0, a2
+; RV64I-NEXT:    slli a0, a0, 32
+; RV64I-NEXT:    srli a0, a0, 32
+; RV64I-NEXT:    snez a0, a0
+; RV64I-NEXT:    ret
+  %cmp1 = icmp ne i32 %a, %b
+  %cmp2 = icmp ne i32 %c, %d
+  %or = or i1 %cmp1, %cmp2
+  ret i1 %or
+}