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| author | Andrew Carlotti <andrew.carlotti@arm.com> | 2022-11-07 14:35:08 +0000 |
|---|---|---|
| committer | Andrew Carlotti <andrew.carlotti@arm.com> | 2022-11-21 16:00:51 +0000 |
| commit | 2aec4088835ae5996ef818b326a0ff133307dbc5 (patch) | |
| tree | ae61e5cda81a5165b736fea2cedbb4a923b688a4 | |
| parent | eea52e38dd81b6632546b7cf933479986c972c69 (diff) | |
| download | gcc-2aec4088835ae5996ef818b326a0ff133307dbc5.zip gcc-2aec4088835ae5996ef818b326a0ff133307dbc5.tar.gz gcc-2aec4088835ae5996ef818b326a0ff133307dbc5.tar.bz2 | |
Modify test, to prevent the next patch breaking it
The upcoming c[lt]z idiom recognition patch eliminates the need for a
brute force computation of the iteration count of these loops. The test
is intended to verify that ivcanon can determine the loop count when the
condition is given by a chain of constant computations.
We replace the constant operations with a more complicated chain that should
resist future idiom recognition.
gcc/testsuite/ChangeLog:
* gcc.dg/pr77975.c: Make tests more robust.
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr77975.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/gcc/testsuite/gcc.dg/pr77975.c b/gcc/testsuite/gcc.dg/pr77975.c index 148cebd..a187ce2 100644 --- a/gcc/testsuite/gcc.dg/pr77975.c +++ b/gcc/testsuite/gcc.dg/pr77975.c @@ -7,10 +7,11 @@ unsigned int foo (unsigned int *b) { - unsigned int a = 3; + unsigned int a = 8; while (a) { - a >>= 1; + a += 5; + a &= 44; *b += a; } return a; @@ -21,10 +22,11 @@ foo (unsigned int *b) unsigned int bar (unsigned int *b) { - unsigned int a = 7; + unsigned int a = 3; while (a) { - a >>= 1; + a += 5; + a &= 44; *b += a; } return a; |