* [PATCH] bitint: Handle VCE from large/huge _BitInt SSA_NAME from load [PR114156]
@ 2024-03-01 8:11 Jakub Jelinek
2024-03-01 9:46 ` Richard Biener
0 siblings, 1 reply; 2+ messages in thread
From: Jakub Jelinek @ 2024-03-01 8:11 UTC (permalink / raw)
To: Richard Biener; +Cc: gcc-patches
Hi!
When adding checks in which case not to merge a VIEW_CONVERT_EXPR from
large/huge _BitInt to vector/complex etc., I missed the case of loads.
Those are handled differently later.
Anyway, I think the load case is something we can handle just fine,
so the following patch does that instead of preventing the merging
gimple_lower_bitint; we'd then copy from memory to memory and and do the
vce only on the second one, it is just better to vce the first one.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2024-03-01 Jakub Jelinek <jakub@redhat.com>
PR middle-end/114156
* gimple-lower-bitint.cc (bitint_large_huge::lower_stmt): Allow
rhs1 of a VCE to have no underlying variable if it is a load and
handle that case.
* gcc.dg/bitint-96.c: New test.
--- gcc/gimple-lower-bitint.cc.jj 2024-02-24 12:44:27.993108306 +0100
+++ gcc/gimple-lower-bitint.cc 2024-02-29 19:28:59.442020619 +0100
@@ -5329,6 +5329,22 @@ bitint_large_huge::lower_stmt (gimple *s
gimple_assign_set_rhs1 (stmt, rhs1);
gimple_assign_set_rhs_code (stmt, SSA_NAME);
}
+ else if (m_names == NULL
+ || !bitmap_bit_p (m_names, SSA_NAME_VERSION (rhs1)))
+ {
+ gimple *g = SSA_NAME_DEF_STMT (rhs1);
+ gcc_assert (gimple_assign_load_p (g));
+ tree mem = gimple_assign_rhs1 (g);
+ tree ltype = TREE_TYPE (lhs);
+ addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (mem));
+ if (as != TYPE_ADDR_SPACE (ltype))
+ ltype
+ = build_qualified_type (ltype,
+ TYPE_QUALS (ltype)
+ | ENCODE_QUAL_ADDR_SPACE (as));
+ rhs1 = build1 (VIEW_CONVERT_EXPR, ltype, mem);
+ gimple_assign_set_rhs1 (stmt, rhs1);
+ }
else
{
int part = var_to_partition (m_map, rhs1);
--- gcc/testsuite/gcc.dg/bitint-96.c.jj 2024-02-29 19:37:27.441032088 +0100
+++ gcc/testsuite/gcc.dg/bitint-96.c 2024-02-29 19:36:34.815753879 +0100
@@ -0,0 +1,17 @@
+/* PR middle-end/114156 */
+/* { dg-do compile { target bitint } } */
+/* { dg-options "-O2" } */
+/* { dg-additional-options "-msse2" { target i?86-*-* x86_64-*-* } } */
+
+#if __BITINT_MAXWIDTH__ >= 128
+_BitInt(128) a, b;
+#else
+int a, b;
+#endif
+
+void
+foo (void)
+{
+ int u = b;
+ __builtin_memmove (&a, &b, sizeof (a));
+}
Jakub
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] bitint: Handle VCE from large/huge _BitInt SSA_NAME from load [PR114156]
2024-03-01 8:11 [PATCH] bitint: Handle VCE from large/huge _BitInt SSA_NAME from load [PR114156] Jakub Jelinek
@ 2024-03-01 9:46 ` Richard Biener
0 siblings, 0 replies; 2+ messages in thread
From: Richard Biener @ 2024-03-01 9:46 UTC (permalink / raw)
To: Jakub Jelinek; +Cc: gcc-patches
On Fri, 1 Mar 2024, Jakub Jelinek wrote:
> Hi!
>
> When adding checks in which case not to merge a VIEW_CONVERT_EXPR from
> large/huge _BitInt to vector/complex etc., I missed the case of loads.
> Those are handled differently later.
> Anyway, I think the load case is something we can handle just fine,
> so the following patch does that instead of preventing the merging
> gimple_lower_bitint; we'd then copy from memory to memory and and do the
> vce only on the second one, it is just better to vce the first one.
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
OK.
Richard.
> 2024-03-01 Jakub Jelinek <jakub@redhat.com>
>
> PR middle-end/114156
> * gimple-lower-bitint.cc (bitint_large_huge::lower_stmt): Allow
> rhs1 of a VCE to have no underlying variable if it is a load and
> handle that case.
>
> * gcc.dg/bitint-96.c: New test.
>
> --- gcc/gimple-lower-bitint.cc.jj 2024-02-24 12:44:27.993108306 +0100
> +++ gcc/gimple-lower-bitint.cc 2024-02-29 19:28:59.442020619 +0100
> @@ -5329,6 +5329,22 @@ bitint_large_huge::lower_stmt (gimple *s
> gimple_assign_set_rhs1 (stmt, rhs1);
> gimple_assign_set_rhs_code (stmt, SSA_NAME);
> }
> + else if (m_names == NULL
> + || !bitmap_bit_p (m_names, SSA_NAME_VERSION (rhs1)))
> + {
> + gimple *g = SSA_NAME_DEF_STMT (rhs1);
> + gcc_assert (gimple_assign_load_p (g));
> + tree mem = gimple_assign_rhs1 (g);
> + tree ltype = TREE_TYPE (lhs);
> + addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (mem));
> + if (as != TYPE_ADDR_SPACE (ltype))
> + ltype
> + = build_qualified_type (ltype,
> + TYPE_QUALS (ltype)
> + | ENCODE_QUAL_ADDR_SPACE (as));
> + rhs1 = build1 (VIEW_CONVERT_EXPR, ltype, mem);
> + gimple_assign_set_rhs1 (stmt, rhs1);
> + }
> else
> {
> int part = var_to_partition (m_map, rhs1);
> --- gcc/testsuite/gcc.dg/bitint-96.c.jj 2024-02-29 19:37:27.441032088 +0100
> +++ gcc/testsuite/gcc.dg/bitint-96.c 2024-02-29 19:36:34.815753879 +0100
> @@ -0,0 +1,17 @@
> +/* PR middle-end/114156 */
> +/* { dg-do compile { target bitint } } */
> +/* { dg-options "-O2" } */
> +/* { dg-additional-options "-msse2" { target i?86-*-* x86_64-*-* } } */
> +
> +#if __BITINT_MAXWIDTH__ >= 128
> +_BitInt(128) a, b;
> +#else
> +int a, b;
> +#endif
> +
> +void
> +foo (void)
> +{
> + int u = b;
> + __builtin_memmove (&a, &b, sizeof (a));
> +}
>
> Jakub
>
>
--
Richard Biener <rguenther@suse.de>
SUSE Software Solutions Germany GmbH,
Frankenstrasse 146, 90461 Nuernberg, Germany;
GF: Ivo Totev, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)
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