183 lines
5.5 KiB
LLVM
183 lines
5.5 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -hotcoldsplit -hotcoldsplit-threshold=0 < %s 2>&1 | FileCheck %s
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
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declare void @cold_use(i8*) cold
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declare void @use(i8*)
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; In this CFG, splitting will extract the blocks extract{1,2}. I.e., it will
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; extract a lifetime.start marker, but not the corresponding lifetime.end
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; marker. Make sure that a lifetime.start marker is emitted before the call to
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; the split function, and *only* that marker.
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;
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; entry
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; / \
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; extract1 no-extract1
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; (lt.start) |
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; / |
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; extract2 |
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; \_____ |
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; \ /
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; exit
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; (lt.end)
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;
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; After splitting, we should see:
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;
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; entry
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; / \
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; codeRepl no-extract1
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; (lt.start) |
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; \ /
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; exit
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; (lt.end)
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define void @only_lifetime_start_is_cold() {
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; CHECK-LABEL: @only_lifetime_start_is_cold(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256
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; CHECK-NEXT: [[LOCAL1_CAST:%.*]] = bitcast i256* [[LOCAL1]] to i8*
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; CHECK-NEXT: br i1 undef, label [[CODEREPL:%.*]], label [[NO_EXTRACT1:%.*]]
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; CHECK: codeRepl:
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; CHECK-NEXT: [[LT_CAST:%.*]] = bitcast i256* [[LOCAL1]] to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[LT_CAST]])
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; CHECK-NEXT: [[TARGETBLOCK:%.*]] = call i1 @only_lifetime_start_is_cold.cold.1(i8* [[LOCAL1_CAST]]) #3
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; CHECK-NEXT: br i1 [[TARGETBLOCK]], label [[NO_EXTRACT1]], label [[EXIT:%.*]]
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; CHECK: no-extract1:
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* [[LOCAL1_CAST]])
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; CHECK-NEXT: ret void
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;
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entry:
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%local1 = alloca i256
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%local1_cast = bitcast i256* %local1 to i8*
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br i1 undef, label %extract1, label %no-extract1
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extract1:
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; lt.start
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %local1_cast)
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call void @cold_use(i8* %local1_cast)
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br i1 undef, label %extract2, label %no-extract1
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extract2:
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br label %exit
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no-extract1:
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br label %exit
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exit:
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; lt.end
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %local1_cast)
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ret void
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}
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; In this CFG, splitting will extract the block extract1. I.e., it will extract
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; a lifetime.end marker, but not the corresponding lifetime.start marker. Do
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; not emit a lifetime.end marker after the call to the split function.
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;
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; entry
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; (lt.start)
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; / \
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; no-extract1 extract1
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; (lt.end) (lt.end)
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; \ /
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; exit
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;
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; After splitting, we should see:
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;
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; entry
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; (lt.start)
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; / \
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; no-extract1 codeRepl
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; (lt.end)
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; \ /
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; exit
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define void @only_lifetime_end_is_cold() {
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; CHECK-LABEL: @only_lifetime_end_is_cold(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256
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; CHECK-NEXT: [[LOCAL1_CAST:%.*]] = bitcast i256* [[LOCAL1]] to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* [[LOCAL1_CAST]])
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; CHECK-NEXT: br i1 undef, label [[NO_EXTRACT1:%.*]], label [[CODEREPL:%.*]]
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; CHECK: no-extract1:
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; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* [[LOCAL1_CAST]])
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; CHECK-NEXT: br label [[EXIT:%.*]]
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; CHECK: codeRepl:
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; CHECK-NEXT: call void @only_lifetime_end_is_cold.cold.1(i8* [[LOCAL1_CAST]]) #3
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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; lt.start
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%local1 = alloca i256
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%local1_cast = bitcast i256* %local1 to i8*
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %local1_cast)
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br i1 undef, label %no-extract1, label %extract1
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no-extract1:
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; lt.end
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %local1_cast)
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br label %exit
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extract1:
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; lt.end
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call void @cold_use(i8* %local1_cast)
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %local1_cast)
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br label %exit
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exit:
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ret void
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}
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; In this CFG, splitting will extract the blocks extract{1,2,3}. Lifting the
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; lifetime.end marker would be a miscompile.
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define void @do_not_lift_lifetime_end() {
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; CHECK-LABEL: @do_not_lift_lifetime_end(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256
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; CHECK-NEXT: [[LOCAL1_CAST:%.*]] = bitcast i256* [[LOCAL1]] to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* [[LOCAL1_CAST]])
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; CHECK-NEXT: br label [[HEADER:%.*]]
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; CHECK: header:
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; CHECK-NEXT: call void @use(i8* [[LOCAL1_CAST]])
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; CHECK-NEXT: br i1 undef, label [[EXIT:%.*]], label [[CODEREPL:%.*]]
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; CHECK: codeRepl:
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; CHECK-NEXT: [[TARGETBLOCK:%.*]] = call i1 @do_not_lift_lifetime_end.cold.1(i8* [[LOCAL1_CAST]]) #3
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; CHECK-NEXT: br i1 [[TARGETBLOCK]], label [[HEADER]], label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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; lt.start
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%local1 = alloca i256
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%local1_cast = bitcast i256* %local1 to i8*
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %local1_cast)
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br label %header
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header:
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; If the lifetime.end marker is lifted, this use becomes dead the second time
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; the header block is executed.
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call void @use(i8* %local1_cast)
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br i1 undef, label %exit, label %extract1
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extract1:
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call void @cold_use(i8* %local1_cast)
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br i1 undef, label %extract2, label %extract3
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extract2:
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; Backedge.
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br label %header
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extract3:
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; lt.end
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %local1_cast)
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br label %exit
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exit:
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ret void
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}
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