9aa1428174
We can look through invariant group intrinsics for the purposes of simplifying the result of a load. Since intrinsics can't be constants, but we also don't want to completely rewrite load constant folding, we convert the load operand to a constant. For GEPs and bitcasts we just treat them as constants. For invariant group intrinsics, we treat them as a bitcast. Relanding with a check for self-referential values. Reviewed By: lebedev.ri Differential Revision: https://reviews.llvm.org/D101103
52 lines
1.6 KiB
LLVM
52 lines
1.6 KiB
LLVM
; RUN: opt -passes=jump-threading -S < %s | FileCheck %s
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; CHECK: @main
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%struct.wobble = type { i8 }
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define i32 @main() local_unnamed_addr personality i8* undef {
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bb12:
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br i1 false, label %bb13, label %bb28
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bb13: ; preds = %bb12
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br label %bb14
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bb14: ; preds = %bb26, %bb13
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%tmp15 = phi i8* [ %tmp27, %bb26 ], [ undef, %bb13 ]
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%tmp16 = icmp slt i32 5, undef
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%tmp17 = select i1 false, i1 true, i1 %tmp16
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br label %bb18
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bb18: ; preds = %bb14
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br i1 %tmp17, label %bb19, label %bb21
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bb19: ; preds = %bb18
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%tmp20 = or i32 undef, 4
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br label %bb21
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bb21: ; preds = %bb19, %bb18
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%tmp22 = load i8, i8* %tmp15, align 1
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br label %bb23
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bb23: ; preds = %bb21
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br i1 %tmp17, label %bb24, label %bb25
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bb24: ; preds = %bb23
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br label %bb25
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bb25: ; preds = %bb24, %bb23
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invoke void undef(%struct.wobble* undef, i32 0, i32 undef, i8 %tmp22)
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to label %bb26 unwind label %bb33
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bb26: ; preds = %bb25
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%tmp27 = getelementptr inbounds i8, i8* %tmp15, i64 1
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br label %bb14
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bb28: ; preds = %bb12
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unreachable
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bb33: ; preds = %bb25
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%tmp34 = landingpad { i8*, i32 }
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cleanup
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unreachable
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}
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