diff options
| author | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2018-03-05 22:13:58 +0000 |
|---|---|---|
| committer | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2018-03-05 22:13:58 +0000 |
| commit | 36ec77582591940a4605548156b11122b3fd76e0 (patch) | |
| tree | c7c2c5cdf293033049f224f00c35f10f0d73b21d | |
| parent | c751e2cd4cc2e15f626c8c9ee6cfeb7fcf48410f (diff) | |
| download | gcc-36ec77582591940a4605548156b11122b3fd76e0.tar.gz | |
PR target/84700
* combine.c (combine_simplify_rtx): Don't try to simplify if
if_then_else_cond returned non-NULL, but either true_rtx or false_rtx
are equal to x.
* gcc.target/powerpc/pr84700.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@258263 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/combine.c | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/powerpc/pr84700.c | 12 |
4 files changed, 29 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5630a84a949..716e77abc99 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2018-03-05 Jakub Jelinek <jakub@redhat.com> + + PR target/84700 + * combine.c (combine_simplify_rtx): Don't try to simplify if + if_then_else_cond returned non-NULL, but either true_rtx or false_rtx + are equal to x. + 2018-03-05 Segher Boessenkool <segher@kernel.crashing.org> * config/rs6000/rs6000.c (rs6000_loop_align): Don't align tiny loops diff --git a/gcc/combine.c b/gcc/combine.c index ddea5b18fe0..a4efd11703c 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5734,7 +5734,11 @@ combine_simplify_rtx (rtx x, machine_mode op0_mode, int in_dest, /* If everything is a comparison, what we have is highly unlikely to be simpler, so don't use it. */ && ! (COMPARISON_P (x) - && (COMPARISON_P (true_rtx) || COMPARISON_P (false_rtx)))) + && (COMPARISON_P (true_rtx) || COMPARISON_P (false_rtx))) + /* Similarly, if we end up with one of the expressions the same + as the original, it is certainly not simpler. */ + && ! rtx_equal_p (x, true_rtx) + && ! rtx_equal_p (x, false_rtx)) { rtx cop1 = const0_rtx; enum rtx_code cond_code = simplify_comparison (NE, &cond, &cop1); diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 9f9afb0df12..ca2986b6221 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2018-03-05 Jakub Jelinek <jakub@redhat.com> + + PR target/84700 + * gcc.target/powerpc/pr84700.c: New test. + 2018-03-05 Nathan Sidwell <nathan@acm.org> PR c++/84702 diff --git a/gcc/testsuite/gcc.target/powerpc/pr84700.c b/gcc/testsuite/gcc.target/powerpc/pr84700.c new file mode 100644 index 00000000000..c89094a56d3 --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/pr84700.c @@ -0,0 +1,12 @@ +/* PR target/84700 */ +/* { dg-do compile } */ +/* { dg-options "-O1 -misel" } */ + +long long int +foo (long long int x) +{ + long long int a = x < 2; + int b = a >= 0; + + return a + ((x == 0) ? a : b); +} |