[llvm] [AMDGPU] New GFX11 v_cmp_tru_* aliases for integer comparisons (PR #118976)

[Jay Foad via llvm-commits]

https://github.com/jayfoad created https://github.com/llvm/llvm-project/pull/118976

This is for compatibility with SP3. It only affects GFX11 because the
v_cmp_t_* instructions were removed in GFX12.


>From 355226113d31bdbe328c930b6e6e04788bac03ad Mon Sep 17 00:00:00 2001
From: Jay Foad <jay.foad at amd.com>
Date: Fri, 6 Dec 2024 14:06:03 +0000
Subject: [PATCH] [AMDGPU] New GFX11 v_cmp_tru_* aliases for integer
 comparisons

This is for compatibility with SP3. It only affects GFX11 because the
v_cmp_t_* instructions were removed in GFX12.
---
 llvm/lib/Target/AMDGPU/VOPCInstructions.td  | 11 +++++++++++
 llvm/test/MC/AMDGPU/gfx11_asm_vopc_alias.s  | 14 ++++++++++++++
 llvm/test/MC/AMDGPU/gfx11_asm_vopcx_alias.s | 14 ++++++++++++++
 3 files changed, 39 insertions(+)
 create mode 100644 llvm/test/MC/AMDGPU/gfx11_asm_vopc_alias.s
 create mode 100644 llvm/test/MC/AMDGPU/gfx11_asm_vopcx_alias.s

diff --git a/llvm/lib/Target/AMDGPU/VOPCInstructions.td b/llvm/lib/Target/AMDGPU/VOPCInstructions.td
index 0a4b51c4ac631d..9bf043ea334fea 100644
--- a/llvm/lib/Target/AMDGPU/VOPCInstructions.td
+++ b/llvm/lib/Target/AMDGPU/VOPCInstructions.td
@@ -1956,6 +1956,17 @@ defm V_CMPX_CLASS_F16_fake16 : VOPCX_Real_t16_gfx11_gfx12<0x0fd, "v_cmpx_class_f
 defm V_CMPX_CLASS_F32     : VOPCX_Real_gfx11_gfx12<0x0fe>;
 defm V_CMPX_CLASS_F64     : VOPCX_Real_gfx11_gfx12<0x0ff>;
 
+let AssemblerPredicate = isGFX11Only in {
+  def : AMDGPUMnemonicAlias<"v_cmp_tru_i32", "v_cmp_t_i32">;
+  def : AMDGPUMnemonicAlias<"v_cmp_tru_u32", "v_cmp_t_u32">;
+  def : AMDGPUMnemonicAlias<"v_cmp_tru_i64", "v_cmp_t_i64">;
+  def : AMDGPUMnemonicAlias<"v_cmp_tru_u64", "v_cmp_t_u64">;
+  def : AMDGPUMnemonicAlias<"v_cmpx_tru_i32", "v_cmpx_t_i32">;
+  def : AMDGPUMnemonicAlias<"v_cmpx_tru_u32", "v_cmpx_t_u32">;
+  def : AMDGPUMnemonicAlias<"v_cmpx_tru_i64", "v_cmpx_t_i64">;
+  def : AMDGPUMnemonicAlias<"v_cmpx_tru_u64", "v_cmpx_t_u64">;
+}
+
 //===----------------------------------------------------------------------===//
 // GFX10.
 //===----------------------------------------------------------------------===//
diff --git a/llvm/test/MC/AMDGPU/gfx11_asm_vopc_alias.s b/llvm/test/MC/AMDGPU/gfx11_asm_vopc_alias.s
new file mode 100644
index 00000000000000..2b95e6a9487465
--- /dev/null
+++ b/llvm/test/MC/AMDGPU/gfx11_asm_vopc_alias.s
@@ -0,0 +1,14 @@
+// NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py UTC_ARGS: --version 5
+// RUN: llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64 -show-encoding %s | FileCheck -check-prefix=GFX11 %s
+
+v_cmp_tru_i32 vcc, v1, v2
+// GFX11: v_cmp_t_i32_e32 vcc, v1, v2             ; encoding: [0x01,0x05,0x8e,0x7c]
+
+v_cmp_tru_u32 vcc, v1, v2
+// GFX11: v_cmp_t_u32_e32 vcc, v1, v2             ; encoding: [0x01,0x05,0x9e,0x7c]
+
+v_cmp_tru_i64 vcc, v[1:2], v[2:3]
+// GFX11: v_cmp_t_i64_e32 vcc, v[1:2], v[2:3]     ; encoding: [0x01,0x05,0xae,0x7c]
+
+v_cmp_tru_u64 vcc, v[1:2], v[2:3]
+// GFX11: v_cmp_t_u64_e32 vcc, v[1:2], v[2:3]     ; encoding: [0x01,0x05,0xbe,0x7c]
diff --git a/llvm/test/MC/AMDGPU/gfx11_asm_vopcx_alias.s b/llvm/test/MC/AMDGPU/gfx11_asm_vopcx_alias.s
new file mode 100644
index 00000000000000..636ec3c19d70f1
--- /dev/null
+++ b/llvm/test/MC/AMDGPU/gfx11_asm_vopcx_alias.s
@@ -0,0 +1,14 @@
+// NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py UTC_ARGS: --version 5
+// RUN: llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64 -show-encoding %s | FileCheck -check-prefix=GFX11 %s
+
+v_cmpx_tru_i32 v1, v2
+// GFX11: v_cmpx_t_i32_e32 v1, v2                 ; encoding: [0x01,0x05,0x8e,0x7d]
+
+v_cmpx_tru_u32 v1, v2
+// GFX11: v_cmpx_t_u32_e32 v1, v2                 ; encoding: [0x01,0x05,0x9e,0x7d]
+
+v_cmpx_tru_i64 v[1:2], v[2:3]
+// GFX11: v_cmpx_t_i64_e32 v[1:2], v[2:3]         ; encoding: [0x01,0x05,0xae,0x7d]
+
+v_cmpx_tru_u64 v[1:2], v[2:3]
+// GFX11: v_cmpx_t_u64_e32 v[1:2], v[2:3]         ; encoding: [0x01,0x05,0xbe,0x7d]