forked from OSchip/llvm-project
23 lines
1.0 KiB
LLVM
23 lines
1.0 KiB
LLVM
; RUN: llc < %s -march=arm64
|
|
|
|
; This test case tests an infinite loop bug in DAG combiner.
|
|
; It just tries to do the following replacing endlessly:
|
|
; (1) Replacing.3 0x2c509f0: v4i32 = any_extend 0x2c4cd08 [ORD=4]
|
|
; With: 0x2c4d128: v4i32 = sign_extend 0x2c4cd08 [ORD=4]
|
|
;
|
|
; (2) Replacing.2 0x2c4d128: v4i32 = sign_extend 0x2c4cd08 [ORD=4]
|
|
; With: 0x2c509f0: v4i32 = any_extend 0x2c4cd08 [ORD=4]
|
|
; As we think the (2) optimization from SIGN_EXTEND to ANY_EXTEND is
|
|
; an optimization to replace unused bits with undefined bits, we remove
|
|
; the (1) optimization (It doesn't make sense to replace undefined bits
|
|
; with signed bits).
|
|
|
|
define <4 x i32> @infiniteLoop(<4 x i32> %in0, <4 x i16> %in1) {
|
|
entry:
|
|
%cmp.i = icmp sge <4 x i16> %in1, <i16 32767, i16 32767, i16 -1, i16 -32768>
|
|
%sext.i = sext <4 x i1> %cmp.i to <4 x i32>
|
|
%mul.i = mul <4 x i32> %in0, %sext.i
|
|
%sext = shl <4 x i32> %mul.i, <i32 16, i32 16, i32 16, i32 16>
|
|
%vmovl.i.i = ashr <4 x i32> %sext, <i32 16, i32 16, i32 16, i32 16>
|
|
ret <4 x i32> %vmovl.i.i
|
|
} |