[llvm] [LegalizeDAG] Freeze index when converting insert_elt/insert_subvector to load/store on stack. (PR #86850)

[Craig Topper via llvm-commits]

================
@@ -123,9 +123,10 @@ define void @insert_32xi8_idx(ptr %src, ptr %dst, i8 %in, i32 %idx) nounwind {
 ; CHECK-NEXT:    bstrins.d $sp, $zero, 4, 0
 ; CHECK-NEXT:    xvld $xr0, $a0, 0
 ; CHECK-NEXT:    xvst $xr0, $sp, 0
-; CHECK-NEXT:    addi.d $a0, $sp, 0
-; CHECK-NEXT:    bstrins.d $a0, $a3, 4, 0
-; CHECK-NEXT:    st.b $a2, $a0, 0
+; CHECK-NEXT:    bstrpick.d $a0, $a3, 31, 0
+; CHECK-NEXT:    addi.d $a3, $sp, 0
+; CHECK-NEXT:    bstrins.d $a3, $a0, 4, 0
----------------
topperc wrote:

This could probably be fixed by adding SimplifyDemandedBitsForTargetNode support for bstrins and bstrpick.

https://github.com/llvm/llvm-project/pull/86850