[llvm] [X86] Create special case for (a-b) - (a<b) -> sbb a, b (PR #161388)

[via llvm-commits]

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@@ -365,3 +365,17 @@ define i32 @uge_sext_add(i32 %0, i32 %1, i32 %2) {
   %6 = add nsw i32 %5, %0
   ret i32 %6
 }
+
+define i32 @sub_sub_ugt(i32 %a, i32 %b) {
+; CHECK-LABEL: sub_sub_ugt:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    cmpl %edi, %esi
+; CHECK-NEXT:    sbbl %esi, %eax
+; CHECK-NEXT:    retq
+  %cmp = icmp ugt i32 %a, %b
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AZero13 wrote:

Yeah I think. 

https://github.com/llvm/llvm-project/pull/161388