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Iterate over all elements and count the number of uses among them for each used load. Then make sure to REPLICATE the load which has the most uses in order to minimize the number of needed element insertions. Review: Ulrich Weigand https://reviews.llvm.org/D54322 llvm-svn: 346637
20 lines
640 B
LLVM
20 lines
640 B
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
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; Test a vector which is built with elements from two loads replicates the
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; load with most elements having its value.
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; CHECK: vlef
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; CHECK-NOT: vlvgf
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define void @update(i32* %src1, i32* %src2, <4 x i32>* %dst) {
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bb:
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%tmp = load i32, i32* %src1
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%tmp1 = load i32, i32* %src2
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%tmp2 = insertelement <4 x i32> undef, i32 %tmp, i32 0
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%tmp3 = insertelement <4 x i32> %tmp2, i32 %tmp1, i32 1
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%tmp4 = insertelement <4 x i32> %tmp3, i32 %tmp1, i32 2
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%tmp5 = insertelement <4 x i32> %tmp4, i32 %tmp1, i32 3
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store <4 x i32> %tmp5, <4 x i32>* %dst
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ret void
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}
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