82309831c3
One of the transforms in LoopSimplifyCFG demands that the LCSSA form is truly maintained for all values, tokens included, otherwise it may end up creating a use that is not dominated by def (and Phi creation for tokens is impossible). Detect this situation and prevent transform for it early. Differential Revision: https://reviews.llvm.org/D129984 Reviewed By: efriedma
83 lines
3.7 KiB
LLVM
83 lines
3.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes='loop-mssa(licm,loop-simplifycfg)' < %s | FileCheck %s
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; Here we end un sinking a user of token down from the loop, therefore breaching LCSSA form.
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; Then, LoopSimplifyCFG expcets that LCSSA form is maintained, and remains unaware that
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; it may be penetrated by tokens. As result, it may end up breaking dominance between def and
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; use by introducing fake temporary edges.
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define i8 addrspace(1)* @test_gc_relocate() gc "statepoint-example" {
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; CHECK-LABEL: @test_gc_relocate(
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; CHECK-NEXT: br label [[BB1:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: switch i32 undef, label [[BB43:%.*]] [
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; CHECK-NEXT: i32 1, label [[BB18:%.*]]
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; CHECK-NEXT: ]
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; CHECK: bb18:
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; CHECK-NEXT: switch i32 undef, label [[BB43]] [
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; CHECK-NEXT: i32 0, label [[BB28:%.*]]
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; CHECK-NEXT: ]
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; CHECK: bb28:
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; CHECK-NEXT: [[TMP34:%.*]] = call token (i64, i32, i8 addrspace(1)* (i64, i32, i32, i32)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_p1i8i64i32i32i32f(i64 2882400000, i32 0, i8 addrspace(1)* (i64, i32, i32, i32)* nonnull elementtype(i8 addrspace(1)* (i64, i32, i32, i32)) @barney.4, i32 4, i32 0, i64 undef, i32 5, i32 5, i32 undef, i32 0, i32 0) [ "deopt"(), "gc-live"(i8 addrspace(1)* undef) ]
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; CHECK-NEXT: br i1 false, label [[BB57:%.*]], label [[BB36:%.*]]
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; CHECK: bb36:
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; CHECK-NEXT: switch i32 undef, label [[BB43]] [
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; CHECK-NEXT: i32 1, label [[BB39:%.*]]
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; CHECK-NEXT: ]
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; CHECK: bb39:
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; CHECK-NEXT: switch i32 undef, label [[BB43]] [
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; CHECK-NEXT: i32 1, label [[BB45:%.*]]
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; CHECK-NEXT: ]
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; CHECK: bb43:
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; CHECK-NEXT: unreachable
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; CHECK: bb45:
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; CHECK-NEXT: br label [[BB1]]
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; CHECK: bb57:
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; CHECK-NEXT: [[TMP35_LE:%.*]] = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token [[TMP34]], i32 0, i32 0)
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; CHECK-NEXT: ret i8 addrspace(1)* [[TMP35_LE]]
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;
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br label %bb1
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bb1: ; preds = %bb45, %0
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switch i32 undef, label %bb43 [
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i32 1, label %bb18
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]
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bb18: ; preds = %bb1
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switch i32 undef, label %bb43 [
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i32 0, label %bb28
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]
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bb28: ; preds = %bb18
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%tmp34 = call token (i64, i32, i8 addrspace(1)* (i64, i32, i32, i32)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_p1i8i64i32i32i32f(i64 2882400000, i32 0, i8 addrspace(1)* (i64, i32, i32, i32)* nonnull elementtype(i8 addrspace(1)* (i64, i32, i32, i32)) @barney.4, i32 4, i32 0, i64 undef, i32 5, i32 5, i32 undef, i32 0, i32 0) [ "deopt"(), "gc-live"(i8 addrspace(1)* undef) ]
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%tmp35 = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %tmp34, i32 0, i32 0) ; (undef, undef)
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br i1 false, label %bb57, label %bb36
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bb36: ; preds = %bb28
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switch i32 undef, label %bb43 [
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i32 1, label %bb39
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]
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bb39: ; preds = %bb36
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switch i32 undef, label %bb43 [
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i32 1, label %bb45
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]
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bb43: ; preds = %bb39, %bb36, %bb18, %bb1
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unreachable
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bb45: ; preds = %bb39
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br label %bb1
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bb57: ; preds = %bb28
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ret i8 addrspace(1)* %tmp35
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}
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declare i8 addrspace(1)* @barney.4(i64, i32, i32, i32)
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declare i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token, i32 immarg, i32 immarg) #0
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declare token @llvm.experimental.gc.statepoint.p0f_p1i8i64i32i32i32f(i64 immarg, i32 immarg, i8 addrspace(1)* (i64, i32, i32, i32)*, i32 immarg, i32 immarg, ...)
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attributes #0 = { nounwind readnone }
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