37 lines
1.3 KiB
LLVM
37 lines
1.3 KiB
LLVM
; RUN: llc < %s -march=x86-64 -mattr=+sse2 | FileCheck %s
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; This test makes sure that the compiler does not crash with an
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; assertion failure when trying to fold a vector shift left
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; by immediate count if the type of the input vector is different
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; to the result type.
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;
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; This happens for example when lowering a shift left of a MVT::v16i8 vector.
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; This is custom lowered into the following sequence:
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; count << 5
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; A = VSHLI(MVT::v8i16, r & (char16)15, 4)
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; B = BITCAST MVT::v16i8, A
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; VSELECT(r, B, count);
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; count += count
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; C = VSHLI(MVT::v8i16, r & (char16)63, 2)
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; D = BITCAST MVT::v16i8, C
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; r = VSELECT(r, C, count);
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; count += count
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; VSELECT(r, r+r, count);
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; count = count << 5;
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;
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; Where 'r' is a vector of type MVT::v16i8, and
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; 'count' is the vector shift count.
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define <16 x i8> @do_not_crash(i8*, i32*, i64*, i32, i64, i8) {
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entry:
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store i8 %5, i8* %0
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%L5 = load i8, i8* %0
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%I8 = insertelement <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>, i8 %L5, i32 7
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%B51 = shl <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>, %I8
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ret <16 x i8> %B51
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}
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; CHECK-LABEL: do_not_crash
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; CHECK: ret
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