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17 lines
819 B
LLVM
17 lines
819 B
LLVM
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; RUN: opt -S -instcombine < %s | FileCheck %s
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; In PR20059 ( http://llvm.org/pr20059 ), shufflevector operations are reordered/removed
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; for an srem operation. This is not a valid optimization because it may cause a trap
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; on div-by-zero.
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; CHECK-LABEL: @do_not_reorder
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; CHECK: %splat1 = shufflevector <4 x i32> %p1, <4 x i32> undef, <4 x i32> zeroinitializer
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; CHECK-NEXT: %splat2 = shufflevector <4 x i32> %p2, <4 x i32> undef, <4 x i32> zeroinitializer
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; CHECK-NEXT: %retval = srem <4 x i32> %splat1, %splat2
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define <4 x i32> @do_not_reorder(<4 x i32> %p1, <4 x i32> %p2) {
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%splat1 = shufflevector <4 x i32> %p1, <4 x i32> undef, <4 x i32> zeroinitializer
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%splat2 = shufflevector <4 x i32> %p2, <4 x i32> undef, <4 x i32> zeroinitializer
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%retval = srem <4 x i32> %splat1, %splat2
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ret <4 x i32> %retval
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}
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