812e64ef0c
Patch to fix some of the regressions in D77804. By folding to rotate/funnel-shift by constant amounts for illegal types, we prevent SimplifyDemandedBits from destroying the patterns prematurely, allowing us to use the rotate/funnel-shift legalization that was added in D112443. Differential Revision: https://reviews.llvm.org/D113192
20 lines
702 B
LLVM
20 lines
702 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=thumbv8--linux-gnueabihf | FileCheck %s
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;; This used to cause a backend crash about not being able to
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;; select ROTL. Make sure if generates the basic VSHL/VSHR.
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define <2 x i64> @testcase(<2 x i64>* %in) {
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; CHECK-LABEL: testcase:
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; CHECK: @ %bb.0:
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; CHECK-NEXT: vld1.64 {d16, d17}, [r0]
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; CHECK-NEXT: vshr.u64 q9, q8, #8
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; CHECK-NEXT: vshl.i64 q8, q8, #56
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; CHECK-NEXT: vorr q0, q8, q9
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; CHECK-NEXT: bx lr
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%1 = load <2 x i64>, <2 x i64>* %in
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%2 = lshr <2 x i64> %1, <i64 8, i64 8>
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%3 = shl <2 x i64> %1, <i64 56, i64 56>
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%4 = or <2 x i64> %2, %3
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ret <2 x i64> %4
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}
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