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* [gcc r12-2854] target/101788 - avoid decomposing hard-register "loads"
@ 2021-08-11 14:24 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2021-08-11 14:24 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:2cb02e065ff015a69db918eb545a00cd6edf0194
commit r12-2854-g2cb02e065ff015a69db918eb545a00cd6edf0194
Author: Richard Biener <rguenther@suse.de>
Date: Wed Aug 11 14:10:52 2021 +0200
target/101788 - avoid decomposing hard-register "loads"
This avoids decomposing hard-register accesses that masquerade as
loads.
2021-08-11 Richard Biener <rguenther@suse.de>
PR target/101877
* tree-ssa-forwprop.c (pass_forwprop::execute): Do not decompose
hard-register accesses.
Diff:
---
gcc/tree-ssa-forwprop.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gcc/tree-ssa-forwprop.c b/gcc/tree-ssa-forwprop.c
index bd64b8e46bc..5b30d4c1a76 100644
--- a/gcc/tree-ssa-forwprop.c
+++ b/gcc/tree-ssa-forwprop.c
@@ -3190,7 +3190,8 @@ pass_forwprop::execute (function *fun)
|| (fun->curr_properties & PROP_gimple_lvec))
&& gimple_assign_load_p (stmt)
&& !gimple_has_volatile_ops (stmt)
- && !stmt_can_throw_internal (cfun, stmt))
+ && !stmt_can_throw_internal (cfun, stmt)
+ && (!VAR_P (rhs) || !DECL_HARD_REGISTER (rhs)))
optimize_vector_load (&gsi);
else if (code == COMPLEX_EXPR)
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