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
190 lines
4.8 KiB
LLVM
190 lines
4.8 KiB
LLVM
; RUN: opt -passes=licm -verify-memoryssa -S %s | FileCheck %s
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; REQUIRES: asserts
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target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64"
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target triple = "s390x-ibm-linux"
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@g_77 = external dso_local global i16, align 2
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; CHECK-LABEL: @f1(i1 %arg)
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define void @f1(i1 %arg) {
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entry:
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store i16 undef, ptr @g_77, align 2
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br label %loop_pre
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unreachablelabel: ; No predecessors
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br label %loop_pre
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loop_pre:
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br label %for.cond.header
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for.cond.header:
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store i32 0, ptr undef, align 4
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br i1 %arg, label %for.body, label %for.end
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for.body:
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%tmp1 = load volatile i16, ptr undef, align 2
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br label %for.end
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for.end:
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br i1 %arg, label %func.exit, label %for.cond.header
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func.exit:
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ret void
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}
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@g_159 = external dso_local global i32, align 4
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; CHECK-LABEL: @f2(i1 %arg)
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define void @f2(i1 %arg) {
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entry:
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br label %for.header.first
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for.header.first:
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br label %for.body.first
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for.body.first:
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store i32 0, ptr @g_159, align 4
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br i1 %arg, label %for.body.first, label %for.end.first
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for.end.first:
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br i1 %arg, label %lor.end, label %for.header.first
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lor.end:
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br label %for.pre
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unreachablelabel: ; No predecessors
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br label %for.pre
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for.pre:
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br label %for.header.second
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for.header.second:
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store i32 undef, ptr undef, align 4
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br label %for.header.second
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}
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@g_271 = external dso_local global i8, align 2
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@g_427 = external dso_local unnamed_addr global [9 x i16], align 2
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; CHECK-LABEL: @f3(i1 %arg)
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define void @f3(i1 %arg) {
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entry:
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br label %for.preheader
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for.preheader:
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store volatile i8 undef, ptr @g_271, align 2
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br i1 %arg, label %for.preheader, label %for.end
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for.end:
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br label %lbl_1058.i
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unreachablelabel: ; No predecessors
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br label %lbl_1058.i
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lbl_1058.i:
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br label %for.cond3.preheader.i
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for.cond3.preheader.i:
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%tmp1 = load i16, ptr getelementptr inbounds ([9 x i16], ptr @g_427, i64 0, i64 2), align 2
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%conv620.i129 = zext i16 %tmp1 to i32
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%cmp621.i130 = icmp ugt i32 undef, %conv620.i129
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%conv622.i131 = zext i1 %cmp621.i130 to i32
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store i32 %conv622.i131, ptr undef, align 4
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br i1 %arg, label %func.exit, label %for.cond3.preheader.i
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func.exit:
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ret void
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}
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@g_6 = external dso_local unnamed_addr global [3 x i32], align 4
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@g_244 = external dso_local global i64, align 8
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@g_1164 = external dso_local global i64, align 8
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; CHECK-LABEL: @f4(i1 %arg)
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define void @f4(i1 %arg) {
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entry:
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br label %for.cond8.preheader
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for.cond8.preheader:
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store i32 0, ptr getelementptr inbounds ([3 x i32], ptr @g_6, i64 0, i64 2), align 4
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br i1 %arg, label %if.end, label %for.cond8.preheader
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if.end:
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br i1 %arg, label %cleanup1270, label %for.cond504.preheader
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for.cond504.preheader:
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store i64 undef, ptr @g_244, align 8
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br label %cleanup1270
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for.cond559.preheader:
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store i64 undef, ptr @g_1164, align 8
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br i1 %arg, label %for.cond559.preheader, label %cleanup1270
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cleanup1270:
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ret void
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}
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@g_1504 = external dso_local local_unnamed_addr global ptr, align 8
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define void @f5(i1 %arg) {
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bb:
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tail call fastcc void @f21()
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br label %bb12.outer
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bb12.outer.loopexit: ; No predecessors!
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br label %bb12.outer
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bb12.outer: ; preds = %bb12.outer.loopexit, %bb
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br i1 %arg, label %bb12.outer.split.us, label %bb12.preheader
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bb12.preheader: ; preds = %bb12.outer
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br label %bb12
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bb12.outer.split.us: ; preds = %bb12.outer
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br label %bb16.us.us
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bb16.us.us: ; preds = %bb16.us.us, %bb12.outer.split.us
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br label %bb16.us.us
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bb12: ; preds = %bb77.1, %bb12.preheader
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br i1 %arg, label %bb25.preheader, label %bb77
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bb25.preheader: ; preds = %bb12.1, %bb12
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br label %bb25
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bb25: ; preds = %l0, %bb25.preheader
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br i1 %arg, label %bb62, label %bb71.thread
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bb62: ; preds = %bb25
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br i1 %arg, label %bb92.loopexit, label %l0
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l0: ; preds = %bb62
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br label %bb25
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bb71.thread: ; preds = %bb25
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br label %bb92
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bb77: ; preds = %bb12
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%tmp78 = load ptr, ptr @g_1504, align 8
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%tmp79 = load volatile ptr, ptr %tmp78, align 8
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br i1 %arg, label %bb91, label %bb12.1
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bb91: ; preds = %bb77.1, %bb77
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unreachable
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bb92.loopexit: ; preds = %bb62
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br label %bb92
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bb92: ; preds = %bb92.loopexit, %bb71.thread
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ret void
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bb12.1: ; preds = %bb77
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br i1 %arg, label %bb25.preheader, label %bb77.1
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bb77.1: ; preds = %bb12.1
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br i1 %arg, label %bb91, label %bb12
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}
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declare void @f21()
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