1f88d80408
As branch on undef is immediate undefined behavior, there is no need to mark one of the edges as feasible. We can leave all the edges non-feasible. In IPSCCP, we can replace the branch with an unreachable terminator. Differential Revision: https://reviews.llvm.org/D126962
61 lines
2.2 KiB
LLVM
61 lines
2.2 KiB
LLVM
; RUN: opt -function-specialization -func-specialization-max-iters=2 -func-specialization-size-threshold=20 -func-specialization-avg-iters-cost=20 -function-specialization-for-literal-constant=true -S < %s | FileCheck %s
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declare hidden i1 @compare(ptr) align 2
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declare hidden { i8, ptr } @getType(ptr) align 2
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; CHECK-LABEL: @foo
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; CHECK-LABEL: @foo.1
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; CHECK-LABEL: @foo.2
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define internal void @foo(ptr %TLI, ptr %DL, ptr %Ty, ptr %ValueVTs, ptr %Offsets, i64 %StartingOffset) {
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entry:
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%VT = alloca i64, align 8
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br i1 false, label %if.then, label %if.end4
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if.then: ; preds = %entry
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ret void
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if.end4: ; preds = %entry
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%cmp = call zeroext i1 @compare(ptr undef)
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br i1 %cmp, label %for.body, label %for.cond16
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for.body: ; preds = %if.end4
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%add13 = add i64 %StartingOffset, undef
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call void @foo(ptr %TLI, ptr %DL, ptr undef, ptr %ValueVTs, ptr %Offsets, i64 %add13)
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unreachable
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for.cond16: ; preds = %for.cond34, %if.end4
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%call27 = call { i8, ptr } @getType(ptr %VT)
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br label %for.cond34
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for.cond34: ; preds = %for.body37, %for.cond16
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br i1 undef, label %for.body37, label %for.cond16
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for.body37: ; preds = %for.cond34
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%tobool39 = icmp ne ptr %Offsets, null
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br label %for.cond34
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}
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define hidden { ptr, i32 } @bar(ptr %this) {
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entry:
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%Offsets = alloca i64, align 8
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%cmp26 = call zeroext i1 @compare(ptr undef)
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br i1 %cmp26, label %for.body28, label %for.cond.cleanup27
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for.cond.cleanup27: ; preds = %entry
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ret { ptr, i32 } undef
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for.body28: ; preds = %entry
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%call33 = call zeroext i1 @compare(ptr undef)
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br i1 %call33, label %if.then34, label %if.end106
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if.then34: ; preds = %for.body28
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call void @foo(ptr %this, ptr undef, ptr undef, ptr undef, ptr null, i64 0)
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unreachable
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if.end106: ; preds = %for.body28
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call void @foo(ptr %this, ptr undef, ptr undef, ptr undef, ptr %Offsets, i64 0)
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unreachable
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}
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