8cda83a5db
Don't lower BUILD_VECTORs to BYTE_MASK, but instead expose the BUILD_VECTORs to the DAGCombiner and select them to VGBM in Select(). This allows the DAGCombiner to understand the constant vector values. For floating point, only all-zeros vectors are now generated with VGBM, as it turned out to be somewhat complicated to handle any arbitrary constants, while in practice this is very rare and hardly needed. The SystemZ ISD opcodes z_byte_mask, z_vzero and z_vones have been removed. Review: Ulrich Weigand https://reviews.llvm.org/D57152 llvm-svn: 353325
37 lines
1.2 KiB
LLVM
37 lines
1.2 KiB
LLVM
; Test that the dag combiner can understand that some vector operands are
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; all-zeros and then optimize the logical operations.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
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define void @f1() {
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; CHECK-LABEL: f1:
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; CHECK: vno
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; CHECK-NOT: vno
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bb:
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%tmp = shufflevector <2 x i64> undef, <2 x i64> undef, <2 x i32> zeroinitializer
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br label %bb1
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bb1: ; preds = %bb
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%tmp2 = load i64, i64* undef, align 8
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%tmp3 = insertelement <2 x i64> undef, i64 %tmp2, i32 1
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%tmp4 = icmp ne <2 x i64> undef, zeroinitializer
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%tmp5 = xor <2 x i1> %tmp4, zeroinitializer
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%tmp6 = xor <2 x i1> zeroinitializer, %tmp5
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%tmp7 = and <2 x i64> %tmp3, %tmp
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%tmp8 = icmp ne <2 x i64> %tmp7, zeroinitializer
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%tmp9 = xor <2 x i1> zeroinitializer, %tmp8
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%tmp10 = icmp ne <2 x i64> undef, zeroinitializer
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%tmp11 = xor <2 x i1> %tmp10, %tmp9
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%tmp12 = and <2 x i1> %tmp6, %tmp11
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%tmp13 = extractelement <2 x i1> %tmp12, i32 0
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br i1 %tmp13, label %bb14, label %bb15
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bb14: ; preds = %bb1
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store i64 undef, i64* undef, align 8
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br label %bb15
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bb15: ; preds = %bb14, %bb1
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unreachable
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}
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