[llvm] [MIPS]Remove unnecessary SLL instructions on MIPS64el (PR #109386)

[via llvm-commits]

================
@@ -1,14 +1,12 @@
-; RUN: llc -O3 -mcpu=mips64r6 -mtriple=mips64el-unknown-linux-gnuabi64 < %s -o - | FileCheck %s
+; RUN: llc -O3 -mcpu=mips64 -mtriple=mips64el-unknown-linux-gnuabi64 < %s -o - | FileCheck %s
 
-; This test shows the unoptimized result with unnecessary SLLs.
 define noundef signext i32 @xor_and(i32 noundef signext %a, i32 noundef signext %b) local_unnamed_addr {
 ; CHECK-LABEL: xor_and:
 ; CHECK:       # %bb.0: # %entry
 ; CHECK-NEXT:    and $1, $5, $4
-; CHECK-NEXT:    sll $1, $1, 0
-; CHECK-NEXT:    not $1, $1
+; CHECK-NEXT:    daddiu $2, $zero, -1
 ; CHECK-NEXT:    jr $ra
-; CHECK-NEXT:    sll $2, $1, 0
+; CHECK-NEXT:    xor $2, $1, $2
 
 entry:
   %0 = and i32 %b, %a
----------------
yingopq wrote:

The return value type is i32, if we need test i64?
And if we need add test for i16 input parameter?

https://github.com/llvm/llvm-project/pull/109386