[llvm] [AMDGPU] Remove unused True16 patterns. (PR #163784)

[Ivan Kosarev via llvm-commits]

https://github.com/kosarev created https://github.com/llvm/llvm-project/pull/163784

No tests seem to need them here or downstream.

>From 17a4259893c85559979398b342f6f436201c76e2 Mon Sep 17 00:00:00 2001
From: Ivan Kosarev <ivan.kosarev at amd.com>
Date: Thu, 16 Oct 2025 14:44:10 +0100
Subject: [PATCH] [AMDGPU] Remove unused True16 patterns.

No tests seem to need them here or downstream.
---
 llvm/lib/Target/AMDGPU/SIInstructions.td | 24 ------------------------
 1 file changed, 24 deletions(-)

diff --git a/llvm/lib/Target/AMDGPU/SIInstructions.td b/llvm/lib/Target/AMDGPU/SIInstructions.td
index 27e5ee9cd4d62..74d41532170a6 100644
--- a/llvm/lib/Target/AMDGPU/SIInstructions.td
+++ b/llvm/lib/Target/AMDGPU/SIInstructions.td
@@ -3481,30 +3481,6 @@ def : GCNPat<
 >;
 } // End True16Predicate
 
-let True16Predicate = UseRealTrue16Insts in {
-def : GCNPat<
-  (fcanonicalize (f16 (VOP3Mods f16:$src, i32:$src_mods))),
-  (V_MUL_F16_t16_e64 0, (i16 CONST.FP16_ONE), $src_mods, $src, 0/*Clamp*/, /*omod*/0, /*opsel*/0)
->;
-
-def : GCNPat<
-  (fcanonicalize (f16 (fneg (VOP3Mods f16:$src, i32:$src_mods)))),
-  (V_MUL_F16_t16_e64 0, (i16 CONST.FP16_NEG_ONE), $src_mods, $src, 0/*Clamp*/, /*omod*/0, /*opsel*/0)
->;
-} // End True16Predicate
-
-let True16Predicate = UseFakeTrue16Insts in {
-def : GCNPat<
-  (fcanonicalize (f16 (VOP3Mods f16:$src, i32:$src_mods))),
-  (V_MUL_F16_fake16_e64 0, (i32 CONST.FP16_ONE), $src_mods, $src)
->;
-
-def : GCNPat<
-  (fcanonicalize (f16 (fneg (VOP3Mods f16:$src, i32:$src_mods)))),
-  (V_MUL_F16_fake16_e64 0, (i32 CONST.FP16_NEG_ONE), $src_mods, $src)
->;
-} // End True16Predicate
-
 def : GCNPat<
   (fcanonicalize (v2f16 (VOP3PMods v2f16:$src, i32:$src_mods))),
   (V_PK_MUL_F16 0, (i32 CONST.FP16_ONE), $src_mods, $src, DSTCLAMP.NONE)