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[AArch64][sve] Prevent incorrect function call on fixed width vector
The isEssentiallyExtractHighSubvector function currently calls getVectorNumElements on a type that in specific cases might be scalable. Since this function only has correct behaviour at the moment on scalable types anyway, the function can just return false when given a fixed type. Differential Revision: https://reviews.llvm.org/D109163 (cherry picked from commit b297531ece896fb9ec36f001a74aef144082602b)
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@ -13680,6 +13680,8 @@ static bool isEssentiallyExtractHighSubvector(SDValue N) {
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N = N.getOperand(0);
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if (N.getOpcode() != ISD::EXTRACT_SUBVECTOR)
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return false;
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if (N.getOperand(0).getValueType().isScalableVector())
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return false;
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return cast<ConstantSDNode>(N.getOperand(1))->getAPIntValue() ==
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N.getOperand(0).getValueType().getVectorNumElements() / 2;
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}
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20
test/CodeGen/AArch64/sve-no-typesize-warnings.ll
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20
test/CodeGen/AArch64/sve-no-typesize-warnings.ll
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@ -0,0 +1,20 @@
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s | FileCheck %s
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target triple = "aarch64-unknown-linux-gnu"
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define <4 x i32> @sve_no_typesize_warning(<vscale x 8 x i16> %a, <4 x i16> %b) #0 {
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; CHECK-LABEL: sve_no_typesize_warning:
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; CHECK: // %bb.0:
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; CHECK-NEXT: uaddl v0.4s, v0.4h, v1.4h
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; CHECK-NEXT: ret
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%a.lo = call <4 x i16> @llvm.experimental.vector.extract.v4i16.nxv8i16(<vscale x 8 x i16> %a, i64 0)
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%a.lo.zext = zext <4 x i16> %a.lo to <4 x i32>
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%b.zext = zext <4 x i16> %b to <4 x i32>
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%add = add <4 x i32> %a.lo.zext, %b.zext
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ret <4 x i32> %add
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}
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declare <4 x i16> @llvm.experimental.vector.extract.v4i16.nxv8i16(<vscale x 8 x i16>, i64)
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attributes #0 = { "target-features"="+sve" }
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