2018-08-16 01:04:58 +08:00
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; RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -disable-early-taildup -disable-cgp -systemz-subreg-liveness < %s | FileCheck %s
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; Check for successful compilation.
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[SelectionDAG] Compute known bits of CopyFromReg
Summary:
Teach SelectionDAG how to compute known bits of ISD::CopyFromReg if
the virtual reg used has one def only.
This can be particularly useful when calling isBaseWithConstantOffset()
with the ISD::CopyFromReg argument, as more optimizations may get enabled
in the result.
Also add a missing truncation on X86, found by testing of this patch.
Change-Id: Id1c9fceec862d118c54a5b53adf72ada5d6daefa
Reviewers: bogner, craig.topper, RKSimon
Reviewed By: RKSimon
Subscribers: lebedev.ri, nemanjai, jvesely, nhaehnle, javed.absar, jsji, jdoerfert, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D59535
llvm-svn: 357745
2019-04-05 15:44:09 +08:00
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; CHECK: lhi {{%r[0-9]+}}, -5
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2018-08-16 01:04:58 +08:00
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target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64"
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target triple = "s390x-ibm-linux"
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; Function Attrs: nounwind
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define void @main() #0 {
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bb:
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%tmp = xor i8 0, -5
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%tmp1 = sext i8 %tmp to i32
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%tmp2 = icmp sgt i8 0, -1
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br label %bb3
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bb3: ; preds = %bb15, %bb
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%tmp4 = phi i64 [ %tmp16, %bb15 ], [ -1, %bb ]
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br i1 undef, label %bb14, label %bb5
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bb5: ; preds = %bb3
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%tmp6 = or i1 %tmp2, false
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2018-11-17 07:13:38 +08:00
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%tmp7 = select i1 %tmp6, i32 0, i32 100
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2018-08-16 01:04:58 +08:00
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%tmp8 = ashr i32 %tmp1, %tmp7
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%tmp9 = zext i32 %tmp8 to i64
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%tmp10 = shl i64 %tmp9, 48
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%tmp11 = ashr exact i64 %tmp10, 48
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%tmp12 = and i64 %tmp11, %tmp4
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%tmp13 = trunc i64 %tmp12 to i32
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store i32 %tmp13, i32* undef, align 4
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br label %bb15
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bb14: ; preds = %bb3
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br label %bb15
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bb15: ; preds = %bb14, %bb5
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%tmp16 = phi i64 [ %tmp4, %bb14 ], [ %tmp12, %bb5 ]
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br label %bb3
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}
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attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="z13" "target-features"="+transactional-execution,+vector" "unsafe-fp-math"="false" "use-soft-float"="false" }
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