[gcc r14-5789] testsuite: Fix subexpressions with `scan-assembler-times'

[Maciej W. Rozycki <macro@gcc.gnu.org>]

https://gcc.gnu.org/g:ba0869323e1d45b1328b4cb723cb139a2e2146c3

commit r14-5789-gba0869323e1d45b1328b4cb723cb139a2e2146c3
Author: Maciej W. Rozycki <macro@embecosm.com>
Date:   Thu Nov 23 16:13:59 2023 +0000

    testsuite: Fix subexpressions with `scan-assembler-times'
    
    We have an issue with `scan-assembler-times' handling expressions using
    subexpressions as produced by capturing parentheses `()' in an odd way,
    and one that is inconsistent with `scan-assembler', `scan-assembler-not',
    etc.  The problem comes from calling `regexp' with `-inline -all', which
    causes a list to be returned that would otherwise be placed in match
    variables.
    
    Consequently if we have say:
    
    /* { dg-final { scan-assembler-times "\\s(foo|bar)\\s" 1 } } */
    
    in a test case and there is a lone `foo' present in output being matched,
    then our invocation of `regexp -inline -all' in `scan-assembler-times'
    will return:
    
    { foo } foo
    
    and that in turn will confuse our match count calculation as `llength'
    will return 2 rather than 1, making the test fail even though `foo' was
    only actually matched once.
    
    It seems unclear why we chose to call `regexp' in such an odd way in the
    first place just to figure out the number of matches.  The first version
    of TCL that supports the `-all' option to `regexp' is 8.3, and according
    to its documentation[1][2] `regexp' already returns the number of matches
    found whenever `-all' has been used *unless* `-inline' has also been used.
    
    Remove the `-inline' option then along with the `llength' invocation.
    
    References:
    
    [1] "Tcl Built-In Commands - regexp manual page",
        <https://www.tcl.tk/man/tcl8.2.3/TclCmd/regexp.html>
    
    [2] "Tcl Built-In Commands - regexp manual page",
        <https://www.tcl.tk/man/tcl8.3/TclCmd/regexp.html>
    
            gcc/testsuite/
            * lib/scanasm.exp (scan-assembler-times): Remove the `-inline'
            option to `regexp' and the wrapping `llength' call.

Diff:
---
 gcc/testsuite/lib/scanasm.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/lib/scanasm.exp b/gcc/testsuite/lib/scanasm.exp
index 85ee54ff9a8..4fbf65744e9 100644
--- a/gcc/testsuite/lib/scanasm.exp
+++ b/gcc/testsuite/lib/scanasm.exp
@@ -505,7 +505,7 @@ proc scan-assembler-times { args } {
     close $fd
     regsub -all {(^|\n)[[:space:]]*\.section[[:space:]]*\.gnu\.lto_(?:[^\n]*\n(?![[:space:]]*\.(section|text|data|bss)))*[^\n]*\n} $text {\1} text
 
-    set result_count [llength [regexp -inline -all -- $pattern $text]]
+    set result_count [regexp -all -- $pattern $text]
     if {$result_count == $times} {
 	pass "$testcase scan-assembler-times $pp_pattern $times"
     } else {