[llvm] [SDAG] Intersect poison-generating flags after CSE (PR #97434)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,29 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=riscv64 | FileCheck %s
+
+declare void @mumble(i32)
+
+define i32 @f(i32 %0) nounwind {
+; CHECK-LABEL: f:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    addi sp, sp, -16
+; CHECK-NEXT:    sd ra, 8(sp) # 8-byte Folded Spill
+; CHECK-NEXT:    sd s0, 0(sp) # 8-byte Folded Spill
+; CHECK-NEXT:    mv s0, a0
+; CHECK-NEXT:    negw a0, a0
+; CHECK-NEXT:    call mumble
+; CHECK-NEXT:    li a0, 4
+; CHECK-NEXT:    subw a0, a0, s0
+; CHECK-NEXT:    ld ra, 8(sp) # 8-byte Folded Reload
+; CHECK-NEXT:    ld s0, 0(sp) # 8-byte Folded Reload
+; CHECK-NEXT:    addi sp, sp, 16
+; CHECK-NEXT:    ret
+  %2 = sub nuw i32 0, %0
+  call void @mumble(i32 %2)
+  %3 = sub i32 1, %0
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arsenm wrote:

Use named values in tests 

https://github.com/llvm/llvm-project/pull/97434