[PATCH] testsuite: Fix subexpressions with `scan-assembler-times'

["Maciej W. Rozycki" <macro@embecosm.com>]

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.
---
Hi,

 Verified with the `riscv64-linux-gnu' target and the C language
testsuite.  OK to apply?

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

gcc-test-scan-assembler-times-count.diff
Index: gcc/gcc/testsuite/lib/scanasm.exp
===================================================================
--- gcc.orig/gcc/testsuite/lib/scanasm.exp
+++ gcc/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 {