[llvm] 9bde296 - [RISCV] Use a ComplexPattern for zexti32 to match sexti32.

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2021-02-24T16:06:29-08:00
New Revision: 9bde29629dfec420dbfbfe550073415452ae81f9

URL: https://github.com/llvm/llvm-project/commit/9bde29629dfec420dbfbfe550073415452ae81f9
DIFF: https://github.com/llvm/llvm-project/commit/9bde29629dfec420dbfbfe550073415452ae81f9.diff

LOG: [RISCV] Use a ComplexPattern for zexti32 to match sexti32.

We just started using a ComplexPattern for sexti32. This updates
zexti32 to match.

Reviewed By: luismarques

Differential Revision: https://reviews.llvm.org/D97231

Added: 
    

Modified: 
    llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
    llvm/lib/Target/RISCV/RISCVISelDAGToDAG.h
    llvm/lib/Target/RISCV/RISCVInstrInfo.td
    llvm/lib/Target/RISCV/RISCVInstrInfoD.td
    llvm/lib/Target/RISCV/RISCVInstrInfoF.td
    llvm/lib/Target/RISCV/RISCVInstrInfoZfh.td

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
index 8bccf41a1123..2682fef7dadf 100644
--- a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
@@ -1149,6 +1149,24 @@ bool RISCVDAGToDAGISel::selectSExti32(SDValue N, SDValue &Val) {
   return false;
 }
 
+bool RISCVDAGToDAGISel::selectZExti32(SDValue N, SDValue &Val) {
+  if (N.getOpcode() == ISD::AND) {
+    auto *C = dyn_cast<ConstantSDNode>(N.getOperand(1));
+    if (C && CheckAndMask(N.getOperand(0), C, UINT64_C(0xFFFFFFFF))) {
+      Val = N.getOperand(0);
+      return true;
+    }
+  }
+  // FIXME: Should we just call computeKnownBits here?
+  if (N.getOpcode() == ISD::AssertZext &&
+      cast<VTSDNode>(N->getOperand(1))->getVT().bitsLE(MVT::i32)) {
+    Val = N;
+    return true;
+  }
+
+  return false;
+}
+
 // Match (srl (and val, mask), imm) where the result would be a
 // zero-extended 32-bit integer. i.e. the mask is 0xffffffff or the result
 // is equivalent to this (SimplifyDemandedBits may have removed lower bits

diff  --git a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.h b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.h
index 96e122684f42..4fa6f5402f78 100644
--- a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.h
+++ b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.h
@@ -55,6 +55,7 @@ class RISCVDAGToDAGISel : public SelectionDAGISel {
   }
 
   bool selectSExti32(SDValue N, SDValue &Val);
+  bool selectZExti32(SDValue N, SDValue &Val);
 
   bool MatchSRLIW(SDNode *N) const;
   bool MatchSLLIUW(SDNode *N) const;

diff  --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.td b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
index 93b3a808d97b..b7deb3a766af 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
@@ -852,9 +852,7 @@ def sexti32 : ComplexPattern<i64, 1, "selectSExti32">;
 def assertzexti32 : PatFrag<(ops node:$src), (assertzext node:$src), [{
   return cast<VTSDNode>(N->getOperand(1))->getVT().bitsLE(MVT::i32);
 }]>;
-def zexti32 : PatFrags<(ops node:$src),
-                       [(and node:$src, 0xffffffff),
-                        (assertzexti32 node:$src)]>;
+def zexti32 : ComplexPattern<i64, 1, "selectZExti32">;
 
 def SRLIWPat : PatFrag<(ops node:$A, node:$B),
                        (srl (and node:$A, imm), node:$B), [{

diff  --git a/llvm/lib/Target/RISCV/RISCVInstrInfoD.td b/llvm/lib/Target/RISCV/RISCVInstrInfoD.td
index fae6b2571189..080156c624da 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoD.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoD.td
@@ -357,7 +357,7 @@ def : Pat<(sext_inreg (assertzexti32 (fp_to_uint FPR64:$rs1)), i32),
 
 // [u]int32->fp
 def : Pat<(sint_to_fp (i64 (sexti32 (i64 GPR:$rs1)))), (FCVT_D_W $rs1)>;
-def : Pat<(uint_to_fp (i64 (zexti32 GPR:$rs1))), (FCVT_D_WU $rs1)>;
+def : Pat<(uint_to_fp (i64 (zexti32 (i64 GPR:$rs1)))), (FCVT_D_WU $rs1)>;
 
 def : Pat<(i64 (fp_to_sint FPR64:$rs1)), (FCVT_L_D FPR64:$rs1, 0b001)>;
 def : Pat<(i64 (fp_to_uint FPR64:$rs1)), (FCVT_LU_D FPR64:$rs1, 0b001)>;

diff  --git a/llvm/lib/Target/RISCV/RISCVInstrInfoF.td b/llvm/lib/Target/RISCV/RISCVInstrInfoF.td
index c4de5b173368..c041a11cc67c 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoF.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoF.td
@@ -401,7 +401,7 @@ def : Pat<(i64 (fp_to_uint FPR32:$rs1)), (FCVT_LU_S $rs1, 0b001)>;
 
 // [u]int->fp. Match GCC and default to using dynamic rounding mode.
 def : Pat<(sint_to_fp (i64 (sexti32 (i64 GPR:$rs1)))), (FCVT_S_W $rs1, 0b111)>;
-def : Pat<(uint_to_fp (i64 (zexti32 GPR:$rs1))), (FCVT_S_WU $rs1, 0b111)>;
+def : Pat<(uint_to_fp (i64 (zexti32 (i64 GPR:$rs1)))), (FCVT_S_WU $rs1, 0b111)>;
 def : Pat<(sint_to_fp (i64 GPR:$rs1)), (FCVT_S_L $rs1, 0b111)>;
 def : Pat<(uint_to_fp (i64 GPR:$rs1)), (FCVT_S_LU $rs1, 0b111)>;
 } // Predicates = [HasStdExtF, IsRV64]

diff  --git a/llvm/lib/Target/RISCV/RISCVInstrInfoZfh.td b/llvm/lib/Target/RISCV/RISCVInstrInfoZfh.td
index fefc69abec83..9a032afac335 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoZfh.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoZfh.td
@@ -358,7 +358,7 @@ def : Pat<(i64 (fp_to_uint FPR16:$rs1)), (FCVT_LU_H $rs1, 0b001)>;
 
 // [u]int->fp. Match GCC and default to using dynamic rounding mode.
 def : Pat<(sint_to_fp (i64 (sexti32 (i64 GPR:$rs1)))), (FCVT_H_W $rs1, 0b111)>;
-def : Pat<(uint_to_fp (i64 (zexti32 GPR:$rs1))), (FCVT_H_WU $rs1, 0b111)>;
+def : Pat<(uint_to_fp (i64 (zexti32 (i64 GPR:$rs1)))), (FCVT_H_WU $rs1, 0b111)>;
 def : Pat<(sint_to_fp (i64 GPR:$rs1)), (FCVT_H_L $rs1, 0b111)>;
 def : Pat<(uint_to_fp (i64 GPR:$rs1)), (FCVT_H_LU $rs1, 0b111)>;
 } // Predicates = [HasStdExtZfh, IsRV64]