[committed] vect: Check partial vector param for supports_partial_vectors [PR104015]
Kewen.Lin
linkw@linux.ibm.com
Fri Jan 14 13:06:56 GMT 2022
Hi,
As described in PR104015, the function partial_vectors_supported_p
mainly checks optabs for partial vectors support query, but we
still have one parameter param_vect_partial_vector_usage to control
the capability.
Power9 introduces vector with length instructions (for
len_load/len_store) but we don't enable partial vector on it by
default. It should be considered as not supporting partial vector by
default. This fix is to make the flag supports_partial_vectors check
param_vect_partial_vector_usage accordingly.
This was approved by Richard in the PR, thanks Richard and Andre for
the comments, pushed via r12-6582.
BR,
Kewen
-----
gcc/ChangeLog:
PR tree-optimization/104015
* tree-vect-loop.c (vect_analyze_loop): Check
param_vect_partial_vector_usage for supports_partial_vectors.
---
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index ba67de490bb..49d53fb3383 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -3026,7 +3026,8 @@ vect_analyze_loop (class loop *loop, vec_info_shared *shared)
vector_modes[0] = autodetected_vector_mode;
mode_i = 0;
- bool supports_partial_vectors = partial_vectors_supported_p ();
+ bool supports_partial_vectors =
+ partial_vectors_supported_p () && param_vect_partial_vector_usage != 0;
poly_uint64 first_vinfo_vf = LOOP_VINFO_VECT_FACTOR (first_loop_vinfo);
while (1)
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