[llvm] [NFC][AMDGPU] Pre-commit test for setcc removal by using add/sub carryout (PR #155118)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+;; Test that carryout from 64-bit add/sub (synthesized from two 32-bit adds/subs) is utilized
+;; (i.e. no additional compare is generated).
+
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 < %s | FileCheck %s
+
+%0 = type { i64, i64, i32, i32 }
+%1 = type { [64 x [8 x i64]] }
+%struct.uint96 = type { i64, i32 }
+%struct.uint64pair = type { i64, i64 }
+
+declare {i64, i1} @llvm.uadd.with.overflow.i64(i64, i64)
+declare {i64, i1} @llvm.usub.with.overflow.i64(i64, i64)
+
+declare {<2 x i64>, <2 x i1>} @llvm.uadd.with.overflow.v2i64(<2 x i64>, <2 x i64>)
+declare {<2 x i64>, <2 x i1>} @llvm.usub.with.overflow.v2i64(<2 x i64>, <2 x i64>)
+
+define hidden %struct.uint96 @add64_32(i64 %val64A, i64 %val64B, i32 %val32) {
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arsenm wrote:

Don't need the hidden. Can you add a v_ prefix to these tests, and add some variants with SGPR inputs? 

https://github.com/llvm/llvm-project/pull/155118