[llvm] 28b1ba1 - [PowerPC] Add an ISEL pattern for i32 MULLI.
via llvm-commits
llvm-commits at lists.llvm.org
Mon Jul 18 01:41:31 PDT 2022
Author: esmeyi
Date: 2022-07-18T04:40:51-04:00
New Revision: 28b1ba1c0742a521037df7ef3a45cc969863eb06
URL: https://github.com/llvm/llvm-project/commit/28b1ba1c0742a521037df7ef3a45cc969863eb06
DIFF: https://github.com/llvm/llvm-project/commit/28b1ba1c0742a521037df7ef3a45cc969863eb06.diff
LOG: [PowerPC] Add an ISEL pattern for i32 MULLI.
We add the following ISEL pattern for i64 imm in D87384, this patch is for i32.
`mul with (2^N * int16_imm) -> MULLI + RLWINM`
Reviewed By: shchenz
Differential Revision: https://reviews.llvm.org/D129708
Added:
Modified:
llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
llvm/test/CodeGen/PowerPC/mulli.ll
Removed:
################################################################################
diff --git a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 4247cf557c2a9..14c4fd3a9ffad 100644
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -5473,7 +5473,8 @@ void PPCDAGToDAGISel::Select(SDNode *N) {
}
case ISD::MUL: {
SDValue Op1 = N->getOperand(1);
- if (Op1.getOpcode() != ISD::Constant || Op1.getValueType() != MVT::i64)
+ if (Op1.getOpcode() != ISD::Constant ||
+ (Op1.getValueType() != MVT::i64 && Op1.getValueType() != MVT::i32))
break;
// If the multiplier fits int16, we can handle it with mulli.
@@ -5486,13 +5487,27 @@ void PPCDAGToDAGISel::Select(SDNode *N) {
// (mul X, c1 << c2) -> (rldicr (mulli X, c1) c2). We do this in ISEL due to
// DAGCombiner prefers (shl (mul X, c1), c2) -> (mul X, c1 << c2).
uint64_t ImmSh = Imm >> Shift;
- if (isInt<16>(ImmSh)) {
- uint64_t SextImm = SignExtend64(ImmSh & 0xFFFF, 16);
+ if (!isInt<16>(ImmSh))
+ break;
+
+ uint64_t SextImm = SignExtend64(ImmSh & 0xFFFF, 16);
+ if (Op1.getValueType() == MVT::i64) {
SDValue SDImm = CurDAG->getTargetConstant(SextImm, dl, MVT::i64);
SDNode *MulNode = CurDAG->getMachineNode(PPC::MULLI8, dl, MVT::i64,
N->getOperand(0), SDImm);
- CurDAG->SelectNodeTo(N, PPC::RLDICR, MVT::i64, SDValue(MulNode, 0),
- getI32Imm(Shift, dl), getI32Imm(63 - Shift, dl));
+
+ SDValue Ops[] = {SDValue(MulNode, 0), getI32Imm(Shift, dl),
+ getI32Imm(63 - Shift, dl)};
+ CurDAG->SelectNodeTo(N, PPC::RLDICR, MVT::i64, Ops);
+ return;
+ } else {
+ SDValue SDImm = CurDAG->getTargetConstant(SextImm, dl, MVT::i32);
+ SDNode *MulNode = CurDAG->getMachineNode(PPC::MULLI, dl, MVT::i32,
+ N->getOperand(0), SDImm);
+
+ SDValue Ops[] = {SDValue(MulNode, 0), getI32Imm(Shift, dl),
+ getI32Imm(0, dl), getI32Imm(31 - Shift, dl)};
+ CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
return;
}
break;
diff --git a/llvm/test/CodeGen/PowerPC/mulli.ll b/llvm/test/CodeGen/PowerPC/mulli.ll
index d60000a5578d7..ead4dd2e07cbe 100644
--- a/llvm/test/CodeGen/PowerPC/mulli.ll
+++ b/llvm/test/CodeGen/PowerPC/mulli.ll
@@ -116,3 +116,12 @@ define i64 @test10(i64 %x) {
ret i64 %res
}
+define i32 @test11(i32 %x) {
+; CHECK-LABEL: test11:
+; CHECK: # %bb.0:
+; CHECK-NEXT: mulli 3, 3, 21845
+; CHECK-NEXT: slwi 3, 3, 5
+; CHECK-NEXT: blr
+ %y = mul nsw i32 %x, 699040
+ ret i32 %y
+}
More information about the llvm-commits
mailing list