[llvm] [InstSimplify] Optimize maximumnum and minimumnum (PR #139581)

[Matt Arsenault via llvm-commits]

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@@ -218,6 +348,22 @@ define <2 x float> @test_minimum_const_inf_nnan_comm_vec(<2 x float> %x) {
   ret <2 x float> %r
 }
 
+define <2 x float> @test_maximumnum_const_inf_nnan_comm_vec(<2 x float> %x) {
+; CHECK-LABEL: @test_maximumnum_const_inf_nnan_comm_vec(
+; CHECK-NEXT:    ret <2 x float> splat (float 0x7FF0000000000000)
+;
+  %r = call nnan <2 x float> @llvm.maximumnum.v2f32(<2 x float> <float 0x7ff0000000000000, float 0x7ff0000000000000>, <2 x float> %x)
+  ret <2 x float> %r
+}
+
+define <2 x float> @test_minimumnum_const_inf_nnan_comm_vec(<2 x float> %x) {
+; CHECK-LABEL: @test_minimumnum_const_inf_nnan_comm_vec(
+; CHECK-NEXT:    ret <2 x float> [[X:%.*]]
+;
+  %r = call nnan <2 x float> @llvm.minimumnum.v2f32(<2 x float> <float 0x7ff0000000000000, float 0x7ff0000000000000>, <2 x float> %x)
+  ret <2 x float> %r
+}
+
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arsenm wrote:

Test a vector with poison elements, and mixed snan and qnan 

https://github.com/llvm/llvm-project/pull/139581