From: Jakub Jelinek <jakub@redhat.com>
To: Richard Biener <rguenther@suse.de>
Cc: gcc-patches@gcc.gnu.org
Subject: [PATCH] bitint: Handle m_bitfld_load cast in outer m_cast_conditional [PR114555]
Date: Thu, 4 Apr 2024 09:29:38 +0200 [thread overview]
Message-ID: <Zg5W4t/VkV0F5Hvq@tucnak> (raw)
Hi!
We ICE on the following testcase, because we use result of a PHI node
which is only conditional because of a m_cast_conditional on the outermost
loops PHI node argument and so is invalid SSA form.
The following patch fixes it like similar cases elsewhere by adding
needed intervening PHI(s).
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2024-04-04 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/114555
* gimple-lower-bitint.cc (bitint_large_huge::handle_cast): For
m_bitfld_load and save_cast_conditional add any needed PHIs
and adjust t4 accordingly.
* gcc.dg/bitint-103.c: New test.
* gcc.dg/bitint-104.c: New test.
--- gcc/gimple-lower-bitint.cc.jj 2024-03-23 11:19:53.000000000 +0100
+++ gcc/gimple-lower-bitint.cc 2024-04-03 15:31:19.686583203 +0200
@@ -1506,7 +1506,7 @@ bitint_large_huge::handle_cast (tree lhs
if (m_bitfld_load)
{
tree t4;
- if (!save_first)
+ if (!save_first && !save_cast_conditional)
t4 = m_data[m_bitfld_load + 1];
else
t4 = make_ssa_name (m_limb_type);
@@ -1519,6 +1519,24 @@ bitint_large_huge::handle_cast (tree lhs
if (edge_true_true)
add_phi_arg (phi, m_data[m_bitfld_load], edge_true_true,
UNKNOWN_LOCATION);
+ if (save_cast_conditional)
+ for (basic_block bb = gsi_bb (m_gsi);;)
+ {
+ edge e1 = single_succ_edge (bb);
+ edge e2 = find_edge (e1->dest, m_bb), e3;
+ tree t5 = ((e2 && !save_first) ? m_data[m_bitfld_load + 1]
+ : make_ssa_name (m_limb_type));
+ phi = create_phi_node (t5, e1->dest);
+ edge_iterator ei;
+ FOR_EACH_EDGE (e3, ei, e1->dest->preds)
+ add_phi_arg (phi, (e3 == e1 ? t4
+ : build_zero_cst (m_limb_type)),
+ e3, UNKNOWN_LOCATION);
+ t4 = t5;
+ if (e2)
+ break;
+ bb = e1->dest;
+ }
m_data[m_bitfld_load] = t4;
m_data[m_bitfld_load + 2] = t4;
m_bitfld_load = 0;
--- gcc/testsuite/gcc.dg/bitint-103.c.jj 2024-04-03 15:34:19.468113199 +0200
+++ gcc/testsuite/gcc.dg/bitint-103.c 2024-04-03 15:34:05.805300917 +0200
@@ -0,0 +1,16 @@
+/* PR tree-optimization/114555 */
+/* { dg-do compile { target bitint } } */
+/* { dg-options "-std=c23 -O2" } */
+
+#if __BITINT_MAXWIDTH__ >= 1225
+struct S { _BitInt(512) : 98; _BitInt(1225) b : 509; } s;
+_BitInt(1225) a;
+#endif
+
+void
+foo (void)
+{
+#if __BITINT_MAXWIDTH__ >= 1225
+ a ^= (unsigned _BitInt(1025)) s.b;
+#endif
+}
--- gcc/testsuite/gcc.dg/bitint-104.c.jj 2024-04-03 15:36:59.385916107 +0200
+++ gcc/testsuite/gcc.dg/bitint-104.c 2024-04-03 15:36:28.034346850 +0200
@@ -0,0 +1,17 @@
+/* PR tree-optimization/114555 */
+/* { dg-do compile { target bitint } } */
+/* { dg-options "-std=c23 -O -fno-tree-forwprop" } */
+
+#if __BITINT_MAXWIDTH__ >= 4139
+struct S { _BitInt(31) : 6; _BitInt(513) b : 241; } s;
+_BitInt(4139) a;
+#endif
+
+void
+foo (void)
+{
+#if __BITINT_MAXWIDTH__ >= 4139
+ int i = 0;
+ a -= s.b << i;
+#endif
+}
Jakub
next reply other threads:[~2024-04-04 7:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-04 7:29 Jakub Jelinek [this message]
2024-04-04 8:06 ` Richard Biener
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