[llvm] [AMDGPU][SDAG] Support source modifiers on select integer operands (PR #147325)

[Janek van Oirschot via llvm-commits]

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@@ -4358,9 +4358,10 @@ define <2 x half> @v_fneg_select_infloop_regression_v2f16(<2 x half> %arg, i1 %a
 ; SI-NEXT:    v_lshlrev_b32_e32 v1, 16, v1
 ; SI-NEXT:    v_or_b32_e32 v0, v0, v1
 ; SI-NEXT:    v_and_b32_e32 v1, 1, v2
-; SI-NEXT:    v_cmp_eq_u32_e32 vcc, 1, v1
-; SI-NEXT:    v_cndmask_b32_e64 v0, v0, 0, vcc
 ; SI-NEXT:    v_xor_b32_e32 v0, 0x80008000, v0
+; SI-NEXT:    v_mov_b32_e32 v2, 0x80008000
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JanekvO wrote:

Why does this explicitly add the constant?

https://github.com/llvm/llvm-project/pull/147325