added remove dup options

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

@@ -0,0 +1,5 @@
+// RUN: llvm-mc -triple=amdgcn -show-encoding %s 2>&1 | FileCheck --check-prefixes=CHECK %s
+
+v_bfrev_b32 v5, v1
+
+v_bfrev_b32 v5, v1

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/Inputs/amdgpu_asm_remove_duplicates.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_dasm_remove_duplicates.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
+
+0x00,0x00,0x00,0x7e

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

@@ -0,0 +1,5 @@
+; 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]

llvm/test/tools/UpdateTestChecks/update_mc_test_checks/amdgpu-remove-duplicates.test

@@ -0,0 +1,7 @@
+# REQUIRES: amdgpu-registered-target
+## Check that remove duplicate is working
+
+# RUN: cp -f %S/Inputs/amdgpu_asm_remove_duplicates.s %t.s && %update_mc_test_checks --remove-duplicate %t.s
+# RUN: diff -u %S/Inputs/amdgpu_asm_remove_duplicates.s.expected %t.s
+# RUN: cp -f %S/Inputs/amdgpu_dasm_remove_duplicates.txt %t.txt && %update_mc_test_checks --remove-duplicate %t.txt
+# RUN: diff -u %S/Inputs/amdgpu_dasm_remove_duplicates.txt.expected %t.txt

llvm/utils/update_mc_test_checks.py

@@ -118,6 +118,12 @@ def main():
         default=None,
         help="Set a default -march for when neither triple nor arch are found in a RUN line",
     )
+
+    parser.add_argument(
+        "--remove-duplicate",
+        action=argparse.BooleanOptionalAction,
+        help="remove duplicated test line if found",
+    )
     parser.add_argument("tests", nargs="+")
     initial_args = common.parse_commandline_args(parser)
 
@@ -196,6 +202,10 @@ def main():
 
         # find all test line from input
         testlines = [l for l in ti.input_lines if isTestLine(l, mc_mode)]
+        # remove duplicated lines to save running time
+        testlines = list(dict.fromkeys(testlines))
+        common.debug("Valid test line found: ", len(testlines))
+
         run_list_size = len(run_list)
         testnum = len(testlines)
 
@@ -233,7 +243,7 @@ def main():
             raw_prefixes.append(prefixes)
 
         output_lines = []
-        generated_prefixes = []
+        generated_prefixes = {}
         used_prefixes = set()
         prefix_set = set([prefix for p in run_list for prefix in p[0]])
         common.debug("Rewriting FileCheck prefixes:", str(prefix_set))
@@ -298,16 +308,21 @@ def main():
                     else:
                         gen_prefix += getStdCheckLine(prefix, o, mc_mode)
 
-            generated_prefixes.append(gen_prefix.rstrip("\n"))
+            generated_prefixes[input_line] = gen_prefix.rstrip("\n")
 
         # write output
-        prefix_id = 0
+        written_lines = set()
         for input_info in ti.iterlines(output_lines):
             input_line = input_info.line
-            if isTestLine(input_line, mc_mode):
+            if input_line in testlines:
+                if ti.args.remove_duplicate:
+                    if input_line in written_lines:
+                        common.debug("Duplicated line skipped: ", input_line)
+                        continue
+                    else:
+                        written_lines.add(input_line)
                 output_lines.append(input_line)
-                output_lines.append(generated_prefixes[prefix_id])
-                prefix_id += 1
+                output_lines.append(generated_prefixes[input_line])
 
             elif should_add_line_to_output(input_line, prefix_set, mc_mode):
                 output_lines.append(input_line)