[VectorCombine] scalarizeLoadExtract - don't create scalar loads if a… · llvm/llvm-project@548d057 (original) (raw)

Original file line number	Diff line number	Diff line change
@@ -24,3 +24,15 @@ define void @multiple_extract(ptr %p) {
24	24	store i32 %e1, ptr %p1, align 4
25	25	ret void
26	26	}
	27	+
	28	+; infinite loop if we fold an extract that is waiting to be erased
	29	+define void @unused_extract(ptr %p) {
	30	+; CHECK-LABEL: @unused_extract(
	31	+; CHECK-NEXT: ret void
	32	+;
	33	+%load = load <4 x float>, ptr %p, align 8
	34	+%shuffle0 = shufflevector <4 x float> zeroinitializer, <4 x float> %load, <4 x i32> <i32 0, i32 4, i32 1, i32 5>
	35	+%shuffle1 = shufflevector <4 x float> %shuffle0, <4 x float> zeroinitializer, <4 x i32> <i32 0, i32 4, i32 poison, i32 poison>
	36	+%extract = extractelement <4 x float> %load, i64 1
	37	+ret void
	38	+}