[RISCV] Use bitsLE instead of strict == MVT::i32 in assertsexti32 and assertzexti32.

The patterns that use this really want to know if the operand has at
least 32 sign/zero bits.

This increases opportunities to use W instructions when the original
source used i8/i16. Not sure how much this matters for performance,
but it makes i8/i16 code more consistent with i32.

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfo.td

@@ -838,13 +838,13 @@ def IsOrAdd: PatFrag<(ops node:$A, node:$B), (or node:$A, node:$B), [{
   return isOrEquivalentToAdd(N);
 }]>;
 def assertsexti32 : PatFrag<(ops node:$src), (assertsext node:$src), [{
-  return cast<VTSDNode>(N->getOperand(1))->getVT() == MVT::i32;
+  return cast<VTSDNode>(N->getOperand(1))->getVT().bitsLE(MVT::i32);
 }]>;
 def sexti32 : PatFrags<(ops node:$src),
                        [(sext_inreg node:$src, i32),
                         (assertsexti32 node:$src)]>;
 def assertzexti32 : PatFrag<(ops node:$src), (assertzext node:$src), [{
-  return cast<VTSDNode>(N->getOperand(1))->getVT() == MVT::i32;
+  return cast<VTSDNode>(N->getOperand(1))->getVT().bitsLE(MVT::i32);
 }]>;
 def zexti32 : PatFrags<(ops node:$src),
                        [(and node:$src, 0xffffffff),

llvm/test/CodeGen/RISCV/double-convert.ll

@@ -281,7 +281,7 @@ define double @fcvt_d_w_i8(i8 signext %a) nounwind {
 ;
 ; RV64IFD-LABEL: fcvt_d_w_i8:
 ; RV64IFD:       # %bb.0:
-; RV64IFD-NEXT:    fcvt.d.l ft0, a0
+; RV64IFD-NEXT:    fcvt.d.w ft0, a0
 ; RV64IFD-NEXT:    fmv.x.d a0, ft0
 ; RV64IFD-NEXT:    ret
   %1 = sitofp i8 %a to double
@@ -301,7 +301,7 @@ define double @fcvt_d_wu_i8(i8 zeroext %a) nounwind {
 ;
 ; RV64IFD-LABEL: fcvt_d_wu_i8:
 ; RV64IFD:       # %bb.0:
-; RV64IFD-NEXT:    fcvt.d.lu ft0, a0
+; RV64IFD-NEXT:    fcvt.d.wu ft0, a0
 ; RV64IFD-NEXT:    fmv.x.d a0, ft0
 ; RV64IFD-NEXT:    ret
   %1 = uitofp i8 %a to double
@@ -321,7 +321,7 @@ define double @fcvt_d_w_i16(i16 signext %a) nounwind {
 ;
 ; RV64IFD-LABEL: fcvt_d_w_i16:
 ; RV64IFD:       # %bb.0:
-; RV64IFD-NEXT:    fcvt.d.l ft0, a0
+; RV64IFD-NEXT:    fcvt.d.w ft0, a0
 ; RV64IFD-NEXT:    fmv.x.d a0, ft0
 ; RV64IFD-NEXT:    ret
   %1 = sitofp i16 %a to double
@@ -341,7 +341,7 @@ define double @fcvt_d_wu_i16(i16 zeroext %a) nounwind {
 ;
 ; RV64IFD-LABEL: fcvt_d_wu_i16:
 ; RV64IFD:       # %bb.0:
-; RV64IFD-NEXT:    fcvt.d.lu ft0, a0
+; RV64IFD-NEXT:    fcvt.d.wu ft0, a0
 ; RV64IFD-NEXT:    fmv.x.d a0, ft0
 ; RV64IFD-NEXT:    ret
   %1 = uitofp i16 %a to double

llvm/test/CodeGen/RISCV/float-convert.ll

@@ -202,7 +202,7 @@ define float @fcvt_s_w_i8(i8 signext %a) nounwind {
 ;
 ; RV64IF-LABEL: fcvt_s_w_i8:
 ; RV64IF:       # %bb.0:
-; RV64IF-NEXT:    fcvt.s.l ft0, a0
+; RV64IF-NEXT:    fcvt.s.w ft0, a0
 ; RV64IF-NEXT:    fmv.x.w a0, ft0
 ; RV64IF-NEXT:    ret
   %1 = sitofp i8 %a to float
@@ -218,7 +218,7 @@ define float @fcvt_s_wu_i8(i8 zeroext %a) nounwind {
 ;
 ; RV64IF-LABEL: fcvt_s_wu_i8:
 ; RV64IF:       # %bb.0:
-; RV64IF-NEXT:    fcvt.s.lu ft0, a0
+; RV64IF-NEXT:    fcvt.s.wu ft0, a0
 ; RV64IF-NEXT:    fmv.x.w a0, ft0
 ; RV64IF-NEXT:    ret
   %1 = uitofp i8 %a to float
@@ -234,7 +234,7 @@ define float @fcvt_s_w_i16(i16 signext %a) nounwind {
 ;
 ; RV64IF-LABEL: fcvt_s_w_i16:
 ; RV64IF:       # %bb.0:
-; RV64IF-NEXT:    fcvt.s.l ft0, a0
+; RV64IF-NEXT:    fcvt.s.w ft0, a0
 ; RV64IF-NEXT:    fmv.x.w a0, ft0
 ; RV64IF-NEXT:    ret
   %1 = sitofp i16 %a to float
@@ -250,7 +250,7 @@ define float @fcvt_s_wu_i16(i16 zeroext %a) nounwind {
 ;
 ; RV64IF-LABEL: fcvt_s_wu_i16:
 ; RV64IF:       # %bb.0:
-; RV64IF-NEXT:    fcvt.s.lu ft0, a0
+; RV64IF-NEXT:    fcvt.s.wu ft0, a0
 ; RV64IF-NEXT:    fmv.x.w a0, ft0
 ; RV64IF-NEXT:    ret
   %1 = uitofp i16 %a to float

llvm/test/CodeGen/RISCV/half-convert.ll

@@ -213,12 +213,12 @@ define half @fcvt_h_si_signext(i16 signext %a) nounwind {
 ;
 ; RV64IZFH-LABEL: fcvt_h_si_signext:
 ; RV64IZFH:       # %bb.0:
-; RV64IZFH-NEXT:    fcvt.h.l fa0, a0
+; RV64IZFH-NEXT:    fcvt.h.w fa0, a0
 ; RV64IZFH-NEXT:    ret
 ;
 ; RV64IDZFH-LABEL: fcvt_h_si_signext:
 ; RV64IDZFH:       # %bb.0:
-; RV64IDZFH-NEXT:    fcvt.h.l fa0, a0
+; RV64IDZFH-NEXT:    fcvt.h.w fa0, a0
 ; RV64IDZFH-NEXT:    ret
   %1 = sitofp i16 %a to half
   ret half %1
@@ -273,12 +273,12 @@ define half @fcvt_h_ui_zeroext(i16 zeroext %a) nounwind {
 ;
 ; RV64IZFH-LABEL: fcvt_h_ui_zeroext:
 ; RV64IZFH:       # %bb.0:
-; RV64IZFH-NEXT:    fcvt.h.lu fa0, a0
+; RV64IZFH-NEXT:    fcvt.h.wu fa0, a0
 ; RV64IZFH-NEXT:    ret
 ;
 ; RV64IDZFH-LABEL: fcvt_h_ui_zeroext:
 ; RV64IDZFH:       # %bb.0:
-; RV64IDZFH-NEXT:    fcvt.h.lu fa0, a0
+; RV64IDZFH-NEXT:    fcvt.h.wu fa0, a0
 ; RV64IDZFH-NEXT:    ret
   %1 = uitofp i16 %a to half
   ret half %1

llvm/test/CodeGen/RISCV/rv64m-exhaustive-w-insts.ll

@@ -1091,7 +1091,7 @@ define zeroext i32 @zext_remw_zext_zext(i32 zeroext %a, i32 zeroext %b) nounwind
 define signext i8 @sext_remw_sext_sext_i8(i8 signext %a, i8 signext %b) nounwind {
 ; RV64IM-LABEL: sext_remw_sext_sext_i8:
 ; RV64IM:       # %bb.0:
-; RV64IM-NEXT:    rem a0, a0, a1
+; RV64IM-NEXT:    remw a0, a0, a1
 ; RV64IM-NEXT:    slli a0, a0, 56
 ; RV64IM-NEXT:    srai a0, a0, 56
 ; RV64IM-NEXT:    ret
@@ -1102,7 +1102,7 @@ define signext i8 @sext_remw_sext_sext_i8(i8 signext %a, i8 signext %b) nounwind
 define signext i16 @sext_remw_sext_sext_i16(i16 signext %a, i16 signext %b) nounwind {
 ; RV64IM-LABEL: sext_remw_sext_sext_i16:
 ; RV64IM:       # %bb.0:
-; RV64IM-NEXT:    rem a0, a0, a1
+; RV64IM-NEXT:    remw a0, a0, a1
 ; RV64IM-NEXT:    slli a0, a0, 48
 ; RV64IM-NEXT:    srai a0, a0, 48
 ; RV64IM-NEXT:    ret