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llvm-project/llvm/test/CodeGen/SystemZ/dag-combine-03.ll

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[SelectionDAG] Handle big endian target BITCAST in computeKnownBits() The BITCAST handling in computeKnownBits() previously only worked for little endian. This patch reverses the iteration over elements for a big endian target which allows this to work in this case also. SystemZ test case. Review: Eli Friedman https://reviews.llvm.org/D44249 llvm-svn: 327764
2018-03-17 16:04:00 +08:00
; Test that DAGCombiner gets helped by getKnownBitsForTargetNode() when
; BITCAST nodes are involved on a big-endian target.
;
; RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 < %s | FileCheck %s
define void @fun() {
entry:
br label %lab0
lab0:
%phi = phi i64 [ %sel, %lab0 ], [ 0, %entry ]
%add = add nuw nsw i64 %phi, 1
[SystemZ] make test immune to scalarization improvements; NFC The undef operands mean this test is probably still too fragile to accomplish what the comments suggest. llvm-svn: 349164
2018-12-15 01:28:52 +08:00
%add2 = add nuw nsw i64 %phi, 2
[SelectionDAG] Handle big endian target BITCAST in computeKnownBits() The BITCAST handling in computeKnownBits() previously only worked for little endian. This patch reverses the iteration over elements for a big endian target which allows this to work in this case also. SystemZ test case. Review: Eli Friedman https://reviews.llvm.org/D44249 llvm-svn: 327764
2018-03-17 16:04:00 +08:00
%cmp = icmp eq i64 %add, undef
[SystemZ] make test immune to scalarization improvements; NFC The undef operands mean this test is probably still too fragile to accomplish what the comments suggest. llvm-svn: 349164
2018-12-15 01:28:52 +08:00
%cmp2 = icmp eq i64 %add2, undef
[SelectionDAG] Handle big endian target BITCAST in computeKnownBits() The BITCAST handling in computeKnownBits() previously only worked for little endian. This patch reverses the iteration over elements for a big endian target which allows this to work in this case also. SystemZ test case. Review: Eli Friedman https://reviews.llvm.org/D44249 llvm-svn: 327764
2018-03-17 16:04:00 +08:00
%ins = insertelement <2 x i1> undef, i1 %cmp, i32 0
[SystemZ] make test immune to scalarization improvements; NFC The undef operands mean this test is probably still too fragile to accomplish what the comments suggest. llvm-svn: 349164
2018-12-15 01:28:52 +08:00
%ins2 = insertelement <2 x i1> undef, i1 %cmp2, i32 0
%xor = xor <2 x i1> %ins, %ins2
[SelectionDAG] Handle big endian target BITCAST in computeKnownBits() The BITCAST handling in computeKnownBits() previously only worked for little endian. This patch reverses the iteration over elements for a big endian target which allows this to work in this case also. SystemZ test case. Review: Eli Friedman https://reviews.llvm.org/D44249 llvm-svn: 327764
2018-03-17 16:04:00 +08:00
%extr = extractelement <2 x i1> %xor, i32 0
; The EXTRACT_VECTOR_ELT is done first into an i32, and then AND:ed with
; 1. The AND is not actually necessary since the element contains a CC (i1)
; value. Test that the BITCAST nodes in the DAG when computing KnownBits is
; handled so that the AND is removed. If this succeeds, this results in a CHI
; instead of TMLL.
; CHECK-LABEL: # %bb.0:
; CHECK: chi
; CHECK-NOT: tmll
; CHECK: j
%sel = select i1 %extr, i64 %add, i64 0
br label %lab0
}