[llvm] [LIT] Print discovered tests and percentages (PR #66057)

[via llvm-commits]

https://github.com/madhur13490 created https://github.com/llvm/llvm-project/pull/66057:

This patch adds "nice-to-have" feature in lit.
it prints the total number of discovered tests at the beginning. It is covenient to see the total number of tests and avoid scrolling up to the beginning of log.

Further, this patch also prints %ge of tests.

Differential Revision: https://reviews.llvm.org/D159081

>From 1a563b1556b9ab30a51d6593912249171a51a2a2 Mon Sep 17 00:00:00 2001
From: Madhur A <madhura at nvidia.com>
Date: Thu, 17 Aug 2023 14:50:36 +0530
Subject: [PATCH] [LIT] Print discovered tests and percentages

This patch adds "nice-to-have" feature in lit.
it prints the total number of discovered tests at the beginning.
It is covenient to see the total number of tests and avoid
scrolling up to the beginning of log.

Further, this patch also prints %ge of tests.

Differential Revision: https://reviews.llvm.org/D159081
---
 llvm/utils/lit/lit/main.py | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/llvm/utils/lit/lit/main.py b/llvm/utils/lit/lit/main.py
index 6858961752a66f1..70230eda48af86f 100755
--- a/llvm/utils/lit/lit/main.py
+++ b/llvm/utils/lit/lit/main.py
@@ -311,6 +311,7 @@ def print_histogram(tests):
 
 def print_results(tests, elapsed, opts):
     tests_by_code = {code: [] for code in lit.Test.ResultCode.all_codes()}
+    total_tests = len(tests)
     for test in tests:
         tests_by_code[test.result.code].append(test)
 
@@ -321,7 +322,7 @@ def print_results(tests, elapsed, opts):
             opts.shown_codes,
         )
 
-    print_summary(tests_by_code, opts.quiet, elapsed)
+    print_summary(total_tests, tests_by_code, opts.quiet, elapsed)
 
 
 def print_group(tests, code, shown_codes):
@@ -336,10 +337,11 @@ def print_group(tests, code, shown_codes):
     sys.stdout.write("\n")
 
 
-def print_summary(tests_by_code, quiet, elapsed):
+def print_summary(total_tests, tests_by_code, quiet, elapsed):
     if not quiet:
         print("\nTesting Time: %.2fs" % elapsed)
 
+    print("\nTotal Discovered Tests: %s" %(total_tests))
     codes = [c for c in lit.Test.ResultCode.all_codes() if not quiet or c.isFailure]
     groups = [(c.label, len(tests_by_code[c])) for c in codes]
     groups = [(label, count) for label, count in groups if count]
@@ -352,4 +354,4 @@ def print_summary(tests_by_code, quiet, elapsed):
     for (label, count) in groups:
         label = label.ljust(max_label_len)
         count = str(count).rjust(max_count_len)
-        print("  %s: %s" % (label, count))
+        print("  %s: %s (%.2f%%)" % (label, count, float(count) / total_tests * 100))