[PATCH] D123989: [RISCV] Add another test showing incorrect BUILD_VECTOR lowering

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck updated this revision to Diff 423556.
frasercrmck added a comment.
Herald added a subscriber: hiraditya.

fix check for negatives


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123989/new/

https://reviews.llvm.org/D123989

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll


Index: llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
===================================================================
--- llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
+++ llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
@@ -745,3 +745,16 @@
 ; CHECK-NEXT:    ret
   ret <4 x i8> <i8 3, i8 3, i8 1, i8 0>
 }
+
+define <16 x i8> @buildvec_not_vid_v16i8() {
+; CHECK-LABEL: buildvec_not_vid_v16i8:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    li a0, 3
+; CHECK-NEXT:    vsetivli zero, 16, e8, m1, ta, mu
+; CHECK-NEXT:    vmv.s.x v9, a0
+; CHECK-NEXT:    vmv.v.i v8, 0
+; CHECK-NEXT:    vsetivli zero, 7, e8, m1, tu, mu
+; CHECK-NEXT:    vslideup.vi v8, v9, 6
+; CHECK-NEXT:    ret
+  ret <16 x i8> <i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 3, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 0, i8 0>
+}
Index: llvm/lib/Target/RISCV/RISCVISelLowering.cpp
===================================================================
--- llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -2186,7 +2186,8 @@
     // a single addi instruction.
     if (((StepOpcode == ISD::MUL && isInt<12>(SplatStepVal)) ||
          (StepOpcode == ISD::SHL && isUInt<5>(SplatStepVal))) &&
-        isPowerOf2_32(StepDenominator) && isInt<5>(Addend)) {
+        isPowerOf2_32(StepDenominator) &&
+        (SplatStepVal >= 0 || StepDenominator == 1) && isInt<5>(Addend)) {
       SDValue VID = DAG.getNode(RISCVISD::VID_VL, DL, ContainerVT, Mask, VL);
       // Convert right out of the scalable type so we can use standard ISD
       // nodes for the rest of the computation. If we used scalable types with


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