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| author | Tamar Christina <tamar.christina@arm.com> | 2020-12-14 15:20:05 +0000 |
|---|---|---|
| committer | Tamar Christina <tamar.christina@arm.com> | 2020-12-14 15:20:11 +0000 |
| commit | 159b0bd9ce263dfb791eff5133b0ca0207201c84 (patch) | |
| tree | b001f9064efae2eb5665b19470366439076c9669 /gcc | |
| parent | 470a25b638fedcaa37ce0c4101f11b87e1fa7d79 (diff) | |
| download | gcc-159b0bd9ce263dfb791eff5133b0ca0207201c84.zip gcc-159b0bd9ce263dfb791eff5133b0ca0207201c84.tar.gz gcc-159b0bd9ce263dfb791eff5133b0ca0207201c84.tar.bz2 | |
middle-end: Exclude TOP permute from blend considerations
Similarly to UNKNOWN permutes, TOP needs to be excluded from being considered
for blends because it produces no permute to check.
gcc/ChangeLog:
PR middle-end/98264
* tree-vect-slp-patterns.c (linear_loads_p): Exclude TOP permute.
gcc/testsuite/ChangeLog:
PR middle-end/98264
* gcc.target/i386/pr98264.c: New test.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/pr98264.c | 22 | ||||
| -rw-r--r-- | gcc/tree-vect-slp-patterns.c | 3 |
2 files changed, 24 insertions, 1 deletions
diff --git a/gcc/testsuite/gcc.target/i386/pr98264.c b/gcc/testsuite/gcc.target/i386/pr98264.c new file mode 100644 index 0000000..ea23527 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr98264.c @@ -0,0 +1,22 @@ +/* { dg-do compile } */ +/* { dg-additional-options "-O3 -w" } */ + +a[], g[], h[]; +double b, c; +double j[]; +i; +l() { + int e = 0; + for (; e < 80; e += 4) { + a[0] = h[e]; + a[1] = h[e + 1]; + j[0] = a[0] - c; + j[1] = a[1] + b; + __attribute__(()) k = *(double *)a, e, f = e = 0; + *g = k; + double *d = j; + for (; e < 2; e++) + if (d[e]) + i = f; + } +} diff --git a/gcc/tree-vect-slp-patterns.c b/gcc/tree-vect-slp-patterns.c index bb2830d..fede889 100644 --- a/gcc/tree-vect-slp-patterns.c +++ b/gcc/tree-vect-slp-patterns.c @@ -240,7 +240,8 @@ linear_loads_p (slp_tree_to_load_perm_map_t *perm_cache, slp_tree root) { complex_load_perm_t res = linear_loads_p (perm_cache, child); kind = vect_merge_perms (kind, res.first); - if (kind == PERM_UNKNOWN) + /* Unknown and Top are not valid on blends as they produce no permute. */ + if (kind == PERM_UNKNOWN || kind == PERM_TOP) return retval; all_loads.safe_push (res.second); } |