https://bugs.llvm.org/show_bug.cgi?id=49509
Bug ID: 49509
Summary: [PowerPC] Infinite loop in PeepholeCROps
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: PowerPC
Assignee: unassignedb...@nondot.org
Reporter: nikita....@gmail.com
CC: llvm-bugs@lists.llvm.org, nemanja.i....@gmail.com
; RUN: llc -O2 < %s
target datalayout = "E-m:e-p:32:32-i64:64-n32"
target triple = "powerpc-unknown-linux-gnu"
define void @test() {
bb:
br i1 undef, label %bb2, label %bb1
bb2: ; preds = %bb
%i = select i1 undef, i64 0, i64 72057594037927936
store i64 %i, i64* undef, align 8
ret void
bb1: ; preds = %bb
%i50 = load i8, i8* undef, align 8
%i52 = load i128, i128* null, align 8
%i62 = icmp eq i8 %i50, 0
br i1 undef, label %bb66, label %bb64
bb64: ; preds = %bb63
ret void
bb66: ; preds = %bb63
%i67 = lshr i128 -1, 0
%i68 = xor i128 %i52, -1
%i69 = add i128 0, %i68
%i70 = and i128 %i67, %i69
%i71 = icmp eq i128 %i70, 0
%i74 = select i1 %i62, i64 0, i64 72057594037927936
%i75 = select i1 %i71, i64 144115188075855872, i64 %i74
store i64 %i75, i64* undef, align 8
ret void
}
This enters an infinite combine loop inside PPCDAGToDAGISel::PeepholeCROps().
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