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

[Thorsten Schütt via llvm-commits]

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@@ -552,14 +557,26 @@ define i64 @gccbug(i64 %x0, i64 %x1) {
 }
 
 define i32 @select_ororand(i32 %w0, i32 %w1, i32 %w2, i32 %w3) {
-; CHECK-LABEL: select_ororand:
-; CHECK:       ; %bb.0:
-; CHECK-NEXT:    cmp w3, #4
-; CHECK-NEXT:    ccmp w2, #2, #0, gt
-; CHECK-NEXT:    ccmp w1, #13, #2, ge
-; CHECK-NEXT:    ccmp w0, #0, #4, ls
-; CHECK-NEXT:    csel w0, w3, wzr, eq
-; CHECK-NEXT:    ret
+; SDISEL-LABEL: select_ororand:
+; SDISEL:       ; %bb.0:
+; SDISEL-NEXT:    cmp w3, #4
+; SDISEL-NEXT:    ccmp w2, #2, #0, gt
+; SDISEL-NEXT:    ccmp w1, #13, #2, ge
+; SDISEL-NEXT:    ccmp w0, #0, #4, ls
+; SDISEL-NEXT:    csel w0, w3, wzr, eq
+; SDISEL-NEXT:    ret
+;
+; GISEL-LABEL: select_ororand:
+; GISEL:       ; %bb.0:
+; GISEL-NEXT:    cmp w3, #4
+; GISEL-NEXT:    csel w8, w3, wzr, gt
+; GISEL-NEXT:    cmp w2, #2
+; GISEL-NEXT:    csel w8, w8, wzr, lt
+; GISEL-NEXT:    cmp w1, #13
+; GISEL-NEXT:    csel w8, w3, w8, hi
+; GISEL-NEXT:    cmp w0, #0
+; GISEL-NEXT:    csel w0, w3, w8, eq
+; GISEL-NEXT:    ret
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tschuett wrote:

The combiner has eliminated the three logical binary operations through chaining, but now we have 4 selects.

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