diff --git a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp index 3e3f3c2eca14684..dc3f8254cb4e005 100644 --- a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp +++ b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp @@ -2938,6 +2938,14 @@ bool RISCVDAGToDAGISel::selectSETCC(SDValue N, ISD::CondCode ExpectedCCVal, 0); return true; } + if (isPowerOf2_64(CVal) && Subtarget->hasStdExtZbs()) { + Val = SDValue( + CurDAG->getMachineNode( + RISCV::BINVI, DL, N->getValueType(0), LHS, + CurDAG->getTargetConstant(Log2_64(CVal), DL, N->getValueType(0))), + 0); + return true; + } } // If nothing else we can XOR the LHS and RHS to produce zero if they are diff --git a/llvm/test/CodeGen/RISCV/rv32zbs.ll b/llvm/test/CodeGen/RISCV/rv32zbs.ll index 30aba61ba474695..c0b9e0b3c7748e6 100644 --- a/llvm/test/CodeGen/RISCV/rv32zbs.ll +++ b/llvm/test/CodeGen/RISCV/rv32zbs.ll @@ -837,3 +837,49 @@ define i64 @bset_trailing_ones_i64_no_mask(i64 %a) nounwind { %not = xor i64 %shift, -1 ret i64 %not } + +define i1 @icmp_eq_pow2(i32 %x) nounwind { +; RV32I-LABEL: icmp_eq_pow2: +; RV32I: # %bb.0: +; RV32I-NEXT: lui a1, 8 +; RV32I-NEXT: xor a0, a0, a1 +; RV32I-NEXT: seqz a0, a0 +; RV32I-NEXT: ret +; +; RV32ZBS-LABEL: icmp_eq_pow2: +; RV32ZBS: # %bb.0: +; RV32ZBS-NEXT: binvi a0, a0, 15 +; RV32ZBS-NEXT: seqz a0, a0 +; RV32ZBS-NEXT: ret + %cmp = icmp eq i32 %x, 32768 + ret i1 %cmp +} + +define i1 @icmp_ne_pow2(i32 %x) nounwind { +; RV32I-LABEL: icmp_ne_pow2: +; RV32I: # %bb.0: +; RV32I-NEXT: lui a1, 8 +; RV32I-NEXT: xor a0, a0, a1 +; RV32I-NEXT: seqz a0, a0 +; RV32I-NEXT: ret +; +; RV32ZBS-LABEL: icmp_ne_pow2: +; RV32ZBS: # %bb.0: +; RV32ZBS-NEXT: binvi a0, a0, 15 +; RV32ZBS-NEXT: seqz a0, a0 +; RV32ZBS-NEXT: ret + %cmp = icmp eq i32 %x, 32768 + ret i1 %cmp +} + +define i1 @icmp_eq_nonpow2(i32 %x) nounwind { +; CHECK-LABEL: icmp_eq_nonpow2: +; CHECK: # %bb.0: +; CHECK-NEXT: lui a1, 8 +; CHECK-NEXT: addi a1, a1, -1 +; CHECK-NEXT: xor a0, a0, a1 +; CHECK-NEXT: seqz a0, a0 +; CHECK-NEXT: ret + %cmp = icmp eq i32 %x, 32767 + ret i1 %cmp +} diff --git a/llvm/test/CodeGen/RISCV/rv64zbs.ll b/llvm/test/CodeGen/RISCV/rv64zbs.ll index d370b1877470c42..577005a051b2043 100644 --- a/llvm/test/CodeGen/RISCV/rv64zbs.ll +++ b/llvm/test/CodeGen/RISCV/rv64zbs.ll @@ -1146,3 +1146,67 @@ define signext i64 @bset_trailing_ones_i64_no_mask(i64 signext %a) nounwind { %not = xor i64 %shift, -1 ret i64 %not } + +define i1 @icmp_eq_pow2(i32 signext %x) nounwind { +; RV64I-LABEL: icmp_eq_pow2: +; RV64I: # %bb.0: +; RV64I-NEXT: lui a1, 8 +; RV64I-NEXT: xor a0, a0, a1 +; RV64I-NEXT: seqz a0, a0 +; RV64I-NEXT: ret +; +; RV64ZBS-LABEL: icmp_eq_pow2: +; RV64ZBS: # %bb.0: +; RV64ZBS-NEXT: binvi a0, a0, 15 +; RV64ZBS-NEXT: seqz a0, a0 +; RV64ZBS-NEXT: ret + %cmp = icmp eq i32 %x, 32768 + ret i1 %cmp +} + +define i1 @icmp_eq_pow2_64(i64 %x) nounwind { +; RV64I-LABEL: icmp_eq_pow2_64: +; RV64I: # %bb.0: +; RV64I-NEXT: li a1, 1 +; RV64I-NEXT: slli a1, a1, 40 +; RV64I-NEXT: xor a0, a0, a1 +; RV64I-NEXT: seqz a0, a0 +; RV64I-NEXT: ret +; +; RV64ZBS-LABEL: icmp_eq_pow2_64: +; RV64ZBS: # %bb.0: +; RV64ZBS-NEXT: binvi a0, a0, 40 +; RV64ZBS-NEXT: seqz a0, a0 +; RV64ZBS-NEXT: ret + %cmp = icmp eq i64 %x, 1099511627776 + ret i1 %cmp +} + +define i1 @icmp_ne_pow2(i32 signext %x) nounwind { +; RV64I-LABEL: icmp_ne_pow2: +; RV64I: # %bb.0: +; RV64I-NEXT: lui a1, 8 +; RV64I-NEXT: xor a0, a0, a1 +; RV64I-NEXT: seqz a0, a0 +; RV64I-NEXT: ret +; +; RV64ZBS-LABEL: icmp_ne_pow2: +; RV64ZBS: # %bb.0: +; RV64ZBS-NEXT: binvi a0, a0, 15 +; RV64ZBS-NEXT: seqz a0, a0 +; RV64ZBS-NEXT: ret + %cmp = icmp eq i32 %x, 32768 + ret i1 %cmp +} + +define i1 @icmp_eq_nonpow2(i32 signext %x) nounwind { +; CHECK-LABEL: icmp_eq_nonpow2: +; CHECK: # %bb.0: +; CHECK-NEXT: lui a1, 8 +; CHECK-NEXT: addiw a1, a1, -1 +; CHECK-NEXT: xor a0, a0, a1 +; CHECK-NEXT: seqz a0, a0 +; CHECK-NEXT: ret + %cmp = icmp eq i32 %x, 32767 + ret i1 %cmp +}