diff options
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/combine.c | 7 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/aarch64/pr68651_1.c | 16 |
4 files changed, 34 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ff297bc..98d6fefe 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2016-01-05 Kyrylo Tkachov <kyrylo.tkachov@arm.com> + + PR rtl-optimization/68651 + * combine.c (combine_simplify_rtx): Canonicalize x + x into + x << 1. + 2016-01-05 Nathan Sidwell <nathan@acm.org> * alias.c (compare_base_decls): Use symtab_node::get. diff --git a/gcc/combine.c b/gcc/combine.c index fd38488..d088031 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5895,6 +5895,13 @@ combine_simplify_rtx (rtx x, machine_mode op0_mode, int in_dest, || XEXP (temp, 1) != XEXP (x, 0))))) return temp; } + + /* Canonicalize x + x into x << 1. */ + if (GET_MODE_CLASS (mode) == MODE_INT + && rtx_equal_p (XEXP (x, 0), XEXP (x, 1)) + && !side_effects_p (XEXP (x, 0))) + return simplify_gen_binary (ASHIFT, mode, XEXP (x, 0), const1_rtx); + break; case MINUS: diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 9ff53ae..4ab864e 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-01-05 Kyrylo Tkachov <kyrylo.tkachov@arm.com> + + PR rtl-optimization/68651 + * gcc.target/aarch64/pr68651_1.c: New test. + 2016-01-05 David Malcolm <dmalcolm@redhat.com> PR c/69122 diff --git a/gcc/testsuite/gcc.target/aarch64/pr68651_1.c b/gcc/testsuite/gcc.target/aarch64/pr68651_1.c new file mode 100644 index 0000000..ef9456f --- /dev/null +++ b/gcc/testsuite/gcc.target/aarch64/pr68651_1.c @@ -0,0 +1,16 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -mcpu=cortex-a53" } */ + +int +foo (int x) +{ + return (x * 2) & 65535; +} +/* { dg-final { scan-assembler "ubfiz\tw\[0-9\]*, w\[0-9\]*.*\n" } } */ + +int +bar (int x, int y) +{ + return (x * 2) | y; +} +/* { dg-final { scan-assembler "orr\tw\[0-9\]*, w\[0-9\]*, w\[0-9\]*, lsl 1.*\n" } } */ |