[llvm] [GlobalIsel] Combine G_SELECT (PR #74116)

[Thorsten Schütt via llvm-commits]

================
@@ -1155,21 +1345,18 @@ define i32 @multiccmp2(i32 %s0, i32 %s1, i32 %s2, i32 %s3, i32 %x, i32 %y) #0 {
 ; GISEL-NEXT:    stp x20, x19, [sp, #16] ; 16-byte Folded Spill
 ; GISEL-NEXT:    stp x29, x30, [sp, #32] ; 16-byte Folded Spill
 ; GISEL-NEXT:    mov x19, x0
-; GISEL-NEXT:    mov x20, x3
-; GISEL-NEXT:    mov x21, x5
-; GISEL-NEXT:    cmp w0, w1
-; GISEL-NEXT:    cset w8, gt
+; GISEL-NEXT:    mov x20, x2
+; GISEL-NEXT:    mov x21, x3
+; GISEL-NEXT:    mov x22, x5
 ; GISEL-NEXT:    cmp w2, w3
-; GISEL-NEXT:    cset w22, ne
-; GISEL-NEXT:    and w8, w8, w22
-; GISEL-NEXT:    tst w8, #0x1
-; GISEL-NEXT:    csel w0, w5, w4, ne
+; GISEL-NEXT:    csel w8, w5, w4, ne
+; GISEL-NEXT:    cmp w0, w1
+; GISEL-NEXT:    csel w0, w8, w4, gt
 ; GISEL-NEXT:    bl _callee
-; GISEL-NEXT:    cmp w19, w20
-; GISEL-NEXT:    cset w8, eq
-; GISEL-NEXT:    and w8, w22, w8
-; GISEL-NEXT:    tst w8, #0x1
-; GISEL-NEXT:    csel w0, w0, w21, ne
+; GISEL-NEXT:    cmp w19, w21
+; GISEL-NEXT:    csel w8, w0, w22, eq
+; GISEL-NEXT:    cmp w20, w21
+; GISEL-NEXT:    csel w0, w8, w22, ne
----------------
tschuett wrote:

win

https://github.com/llvm/llvm-project/pull/74116