22 lines
899 B
LLVM
22 lines
899 B
LLVM
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
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; When the extractelement is converted to a load the store can be re-used.
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; This will, however, introduce a cycle into the selection DAG (the load
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; of the extractelement index is dependent on the store, and so after the
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; conversion it becomes dependent on the new load, which is dependent on
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; the index). Make sure we skip the store, and conservatively instead
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; use a store to the stack.
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define float @foo(i32* %i, <4 x float>* %v) {
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; CHECK-LABEL: foo:
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; CHECK: movaps %xmm0, -[[OFFSET:[0-9]+]](%rsp)
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; CHECK: movss -[[OFFSET]](%rsp,{{.*}}), %xmm0 {{.*}}
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; CHECK-NEXT: retq
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%1 = load <4 x float>, <4 x float>* %v, align 16
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%mul = fmul <4 x float> %1, %1
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store <4 x float> %mul, <4 x float>* %v, align 16
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%2 = load i32, i32* %i, align 4
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%vecext = extractelement <4 x float> %mul, i32 %2
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ret float %vecext
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}
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