added a script to update llvm-mc test file (#107246)

Added a script to update the test file generated by llvm-mc binary. The
script accepts .s and .txt for asm and dasm.

For mc test I am targetting there is no function name which can be used
as a key, thus no clear mapping between input and output. The script
assumes the test are always line-by-line and it update the output marker
for each test line-by-line.

---------

Co-authored-by: Alexander Richardson <[email protected]>

Author: broxigarchen

llvm/test/tools/UpdateTestChecks/lit.local.cfg

@@ -52,3 +52,7 @@ if os.path.isfile(llvm_mca_path):
 split_file_path = os.path.join(config.llvm_tools_dir, "split-file")
 if os.path.isfile(split_file_path):
     add_update_script_substition("%update_test_body")
+
+llvm_mc_path = os.path.join(config.llvm_tools_dir, "llvm-mc")
+if os.path.isfile(llvm_mc_path):
+    add_update_script_substition("%update_mc_test_checks")

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_asm.s

@@ -0,0 +1,3 @@
+// RUN: llvm-mc -triple=amdgcn -show-encoding %s 2>&1 | FileCheck --check-prefixes=CHECK %s
+
+v_bfrev_b32 v5, v1

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_asm.s.expected

@@ -0,0 +1,5 @@
+; NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py
+// RUN: llvm-mc -triple=amdgcn -show-encoding %s 2>&1 | FileCheck --check-prefixes=CHECK %s
+
+v_bfrev_b32 v5, v1
+// CHECK: v_bfrev_b32_e32 v5, v1                  ; encoding: [0x01,0x71,0x0a,0x7e]

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_asm_err.s

@@ -0,0 +1,3 @@
+// RUN: not llvm-mc -triple=amdgcn -show-encoding %s 2>&1 | FileCheck --check-prefixes=CHECK %s
+
+v_bfrev_b32 v5, v299

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_asm_err.s.expected

@@ -0,0 +1,5 @@
+; NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py
+// RUN: not llvm-mc -triple=amdgcn -show-encoding %s 2>&1 | FileCheck --check-prefixes=CHECK %s
+
+v_bfrev_b32 v5, v299
+// CHECK: :[[@LINE-1]]:17: error: register index is out of range

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_dasm.txt

@@ -0,0 +1,5 @@
+# RUN: llvm-mc -triple=amdgcn -mcpu=gfx1100 -disassemble -show-encoding %s 2>&1 | FileCheck -check-prefixes=CHECK %s
+
+0x00,0x00,0x00,0x7e
+
+0xfd,0xb8,0x0a,0x7f

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_dasm.txt.expected

@@ -0,0 +1,8 @@
+; NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py
+# RUN: llvm-mc -triple=amdgcn -mcpu=gfx1100 -disassemble -show-encoding %s 2>&1 | FileCheck -check-prefixes=CHECK %s
+
+0x00,0x00,0x00,0x7e
+# CHECK: v_nop                                   ; encoding: [0x00,0x00,0x00,0x7e]
+
+0xfd,0xb8,0x0a,0x7f
+# CHECK: :[[@LINE-1]]:1: warning: invalid instruction encoding

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_multirun_dasm.txt

@@ -0,0 +1,6 @@
+# RUN: llvm-mc -triple=amdgcn -mcpu=tonga -disassemble -show-encoding %s 2>&1 | FileCheck -check-prefixes=CHECK,CHECKA %s
+# RUN: llvm-mc -triple=amdgcn -mcpu=gfx1100 -disassemble -show-encoding %s 2>&1 | FileCheck -check-prefixes=CHECK,CHECKB %s
+
+0x00,0x00,0x00,0x7e
+
+0x01,0x71,0x0a,0x7e

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_multirun_dasm.txt.expected

@@ -0,0 +1,10 @@
+; NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py
+# RUN: llvm-mc -triple=amdgcn -mcpu=tonga -disassemble -show-encoding %s 2>&1 | FileCheck -check-prefixes=CHECK,CHECKA %s
+# RUN: llvm-mc -triple=amdgcn -mcpu=gfx1100 -disassemble -show-encoding %s 2>&1 | FileCheck -check-prefixes=CHECK,CHECKB %s
+
+0x00,0x00,0x00,0x7e
+# CHECK: v_nop                                   ; encoding: [0x00,0x00,0x00,0x7e]
+
+0x01,0x71,0x0a,0x7e
+# CHECKA: v_movrelsd_b32_e32 v5, v1               ; encoding: [0x01,0x71,0x0a,0x7e]
+# CHECKB: v_bfrev_b32_e32 v5, v1                  ; encoding: [0x01,0x71,0x0a,0x7e]

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/amdgpu-basic.test

@@ -0,0 +1,11 @@
+# REQUIRES: amdgpu-registered-target
+## Check that basic asm/dasm process is correct
+
+# RUN: cp -f %S/Inputs/amdgpu_asm.s %t.s && %update_mc_test_checks %t.s
+# RUN: diff -u %S/Inputs/amdgpu_asm.s.expected %t.s
+# RUN: cp -f %S/Inputs/amdgpu_asm_err.s %t.s && %update_mc_test_checks %t.s
+# RUN: diff -u %S/Inputs/amdgpu_asm_err.s.expected %t.s
+# RUN: cp -f %S/Inputs/amdgpu_dasm.txt %t.txt && %update_mc_test_checks %t.txt
+# RUN: diff -u %S/Inputs/amdgpu_dasm.txt.expected %t.txt
+# RUN: cp -f %S/Inputs/amdgpu_multirun_dasm.txt %t.txt && %update_mc_test_checks %t.txt
+# RUN: diff -u %S/Inputs/amdgpu_multirun_dasm.txt.expected %t.txt