[llvm] [NVPTX] fold movs into loads and stores (PR #144581)

[Artem Belevich via llvm-commits]

================
@@ -514,15 +512,15 @@ define half @reduce_fmin_half_reassoc_nonpow2(<7 x half> %in) {
 ; CHECK-NEXT:  // %bb.0:
 ; CHECK-NEXT:    ld.param.b32 %r1, [reduce_fmin_half_reassoc_nonpow2_param_0+8];
 ; CHECK-NEXT:    mov.b32 {%rs5, %rs6}, %r1;
-; CHECK-NEXT:    ld.param.v4.b16 {%rs1, %rs2, %rs3, %rs4}, [reduce_fmin_half_reassoc_nonpow2_param_0];
-; CHECK-NEXT:    mov.b32 %r2, {%rs1, %rs2};
-; CHECK-NEXT:    mov.b32 %r3, {%rs3, %rs4};
+; CHECK-NEXT:    ld.param.v2.b32 {%r2, %r3}, [reduce_fmin_half_reassoc_nonpow2_param_0];
+; CHECK-NEXT:    mov.b32 {%rs3, %rs4}, %r3;
+; CHECK-NEXT:    mov.b32 {%rs1, %rs2}, %r2;
----------------
Artem-B wrote:

Why do we still have these moves, even though `%rs1-8` do not seem to be used anywhere?

https://github.com/llvm/llvm-project/pull/144581