Bugzilla Link	49509
Resolution	FIXED
Resolved on	Mar 29, 2021 16:55
Version	trunk
OS	Linux
Blocks	#48246
CC	@jrmuizel,@nemanjai,@nagisa
Fixed by commit(s)	2489cba 8ca5690

Extended Description

; 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().