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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2015-07-03 16:37:26 +0200 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2015-07-03 16:37:26 +0200 |
| commit | ab1d746dcedf646029bbbfbb7f85156e8dc63c1e (patch) | |
| tree | d9bc9e4d6bba935d16a93352112cf875a52ad20b /gcc | |
| parent | ed3caa8c2aceecd0b1e4f0eb06f723f7849f8183 (diff) | |
| download | gcc-ab1d746dcedf646029bbbfbb7f85156e8dc63c1e.zip gcc-ab1d746dcedf646029bbbfbb7f85156e8dc63c1e.tar.gz gcc-ab1d746dcedf646029bbbfbb7f85156e8dc63c1e.tar.bz2 | |
re PR rtl-optimization/66706 (Redundant bitmask instruction on x >> (n & 32))
PR rtl-optimization/66706
* gcc.target/powerpc/shift-int.c: New testcase.
From-SVN: r225382
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/powerpc/shift-int.c | 23 |
2 files changed, 28 insertions, 0 deletions
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 05344971..493b730 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2015-07-03 Segher Boessenkool <segher@kernel.crashing.org> + + PR rtl-optimization/66706 + * gcc.target/powerpc/shift-int.c: New testcase. + 2015-07-03 H.J. Lu <hongjiu.lu@intel.com> PR target/66746. diff --git a/gcc/testsuite/gcc.target/powerpc/shift-int.c b/gcc/testsuite/gcc.target/powerpc/shift-int.c new file mode 100644 index 0000000..fe696ea --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/shift-int.c @@ -0,0 +1,23 @@ +/* Check that shifts do not get unnecessary extends. + See PR66706 for a case where this failed. */ + +/* { dg-do compile } */ +/* { dg-options "-O2" } */ + +/* Each function should compile to exactly two instructions. */ +/* { dg-final { scan-assembler-times {(?n)^\s+[a-z]} 16 } } */ +/* { dg-final { scan-assembler-times {(?n)^\s+blr} 8 } } */ + + +typedef unsigned u; +typedef signed s; + +u rot(u x, u n) { return (x << n) | (x >> (32 - n)); } +u shl(u x, u n) { return x << n; } +u shr(u x, u n) { return x >> n; } +s asr(s x, u n) { return x >> n; } + +u roti(u x) { return (x << 23) | (x >> 9); } +u shli(u x) { return x << 23; } +u shri(u x) { return x >> 23; } +s asri(s x) { return x >> 23; } |