1469d82e1c
As defined in LangRef, branching on `undef` is undefined behavior. This PR aims to remove undefined behavior from tests. As UB tests break Alive2 and may be the root cause of breaking future optimizations. Here's an Alive2 proof for one of the examples: https://alive2.llvm.org/ce/z/TncxhP
132 lines
3.6 KiB
LLVM
132 lines
3.6 KiB
LLVM
; RUN: opt -S -passes='require<memoryssa>' %s | FileCheck %s
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; REQUIRES: asserts
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK-LABEL: @func(i1 %arg)
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; Function Attrs: noinline
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define dso_local void @func(i1 %arg) unnamed_addr #0 align 2 {
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entry:
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%NoFinalize.addr = alloca i8, align 1
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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%call8 = call zeroext i1 @foo()
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br i1 %call8, label %if.then9, label %while.cond
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if.then9: ; preds = %entry
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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br label %while.cond
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while.cond: ; preds = %cleanup, %if.then9, %entry
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%call34 = call zeroext i1 @foo()
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call void @blah()
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br i1 %call34, label %while.body, label %while.end
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while.body: ; preds = %while.cond
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%call35 = call zeroext i1 @foo()
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br i1 %call35, label %if.end37, label %if.then36
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if.then36: ; preds = %while.body
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store i32 2, ptr undef, align 4
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br label %cleanup
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if.end37: ; preds = %while.body
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%call38 = call zeroext i1 @foo()
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br i1 %call38, label %if.end46, label %land.lhs.true
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land.lhs.true: ; preds = %if.end37
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call void @blah()
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%call41 = call zeroext i1 @foo()
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br i1 %call41, label %if.then42, label %if.end46
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if.then42: ; preds = %land.lhs.true
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call void @blah()
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br label %if.end46
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if.end46: ; preds = %if.then42, %land.lhs.true, %if.end37
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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br label %cleanup
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cleanup: ; preds = %if.end46, %if.then36
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call void @blah()
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br label %while.cond
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while.end: ; preds = %while.cond
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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%call93 = call zeroext i1 @foo()
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br i1 %call93, label %if.end120, label %if.then94
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if.then94: ; preds = %while.end
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store i32 0, ptr undef, align 4
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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br label %for.cond
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for.cond: ; preds = %for.body, %if.then94
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br i1 %arg, label %for.body, label %if.end120
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for.body: ; preds = %for.cond
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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br label %for.cond
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if.end120: ; preds = %for.cond, %while.end
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%val = load i8, ptr %NoFinalize.addr, align 1
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ret void
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}
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; Function Attrs: noinline
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declare hidden void @blah() unnamed_addr #0 align 2
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; Function Attrs: noinline
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declare hidden i1 @foo() local_unnamed_addr #0 align 2
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attributes #0 = { noinline }
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