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| author | Jakub Jelinek <jakub@redhat.com> | 2013-03-05 07:04:14 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2013-03-05 07:04:14 +0100 |
| commit | 86efb5cd550babd6bf69ead21cc73f0012c55a97 (patch) | |
| tree | 19a88c3e3d27c85213863432bf8347f0776184b1 /gcc | |
| parent | 85f5dbea3df7d0a97401259a273db2b8d02119e8 (diff) | |
| download | gcc-86efb5cd550babd6bf69ead21cc73f0012c55a97.zip gcc-86efb5cd550babd6bf69ead21cc73f0012c55a97.tar.gz gcc-86efb5cd550babd6bf69ead21cc73f0012c55a97.tar.bz2 | |
re PR rtl-optimization/56494 (ICE in simplify_truncation, at simplify-rtx.c:619)
PR rtl-optimization/56494
* simplify-rtx.c (simplify_truncation): If C is narrower than A,
optimize (truncate:A (subreg:B (truncate:C X) 0)) into
(subreg:A (truncate:C X) 0) instead of (truncate:A X).
* gcc.dg/pr56494.c: New test.
From-SVN: r196451
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/simplify-rtx.c | 13 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr56494.c | 13 |
4 files changed, 34 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3abc676..2678b16 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2013-03-05 Jakub Jelinek <jakub@redhat.com> + PR rtl-optimization/56494 + * simplify-rtx.c (simplify_truncation): If C is narrower than A, + optimize (truncate:A (subreg:B (truncate:C X) 0)) into + (subreg:A (truncate:C X) 0) instead of (truncate:A X). + PR middle-end/56461 * sel-sched-ir.c (free_sched_pools): Release succs_info_pool.stack[succs_info_pool.max_top] vectors too diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 3f04b8b..43700cf 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -757,8 +757,17 @@ simplify_truncation (enum machine_mode mode, rtx op, && SCALAR_INT_MODE_P (GET_MODE (SUBREG_REG (op))) && GET_CODE (SUBREG_REG (op)) == TRUNCATE && subreg_lowpart_p (op)) - return simplify_gen_unary (TRUNCATE, mode, XEXP (SUBREG_REG (op), 0), - GET_MODE (XEXP (SUBREG_REG (op), 0))); + { + rtx inner = XEXP (SUBREG_REG (op), 0); + if (GET_MODE_PRECISION (mode) + <= GET_MODE_PRECISION (GET_MODE (SUBREG_REG (op)))) + return simplify_gen_unary (TRUNCATE, mode, inner, GET_MODE (inner)); + else + /* If subreg above is paradoxical and C is narrower + than A, return (subreg:A (truncate:C X) 0). */ + return simplify_gen_subreg (mode, SUBREG_REG (op), + GET_MODE (SUBREG_REG (op)), 0); + } /* (truncate:A (truncate:B X)) is (truncate:A X). */ if (GET_CODE (op) == TRUNCATE) diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 19c64d6..4529bcf 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2013-03-05 Jakub Jelinek <jakub@redhat.com> + + PR rtl-optimization/56494 + * gcc.dg/pr56494.c: New test. + 2013-01-04 Eric Botcazou <ebotcazou@adacore.com> * gcc.dg/pr56424.c: New test. diff --git a/gcc/testsuite/gcc.dg/pr56494.c b/gcc/testsuite/gcc.dg/pr56494.c new file mode 100644 index 0000000..e73d674 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr56494.c @@ -0,0 +1,13 @@ +/* PR rtl-optimization/56494 */ +/* { dg-do compile } */ +/* { dg-options "-O2 -ftracer -w" } */ + +char a; +short b; +void bar (int); + +void +foo (void) +{ + bar ((!!b ? : (a *= a / 0)) >= (a = b)); +} |