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* [gcc r11-10363] c, c++: Fix up excess precision handling of scalar_to_vector conversion [PR107358]
@ 2022-11-04 8:31 Jakub Jelinek
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From: Jakub Jelinek @ 2022-11-04 8:31 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:57da0797a73f32c879bca77e121a4f55fcc57ce1
commit r11-10363-g57da0797a73f32c879bca77e121a4f55fcc57ce1
Author: Jakub Jelinek <jakub@redhat.com>
Date: Mon Oct 24 17:53:16 2022 +0200
c, c++: Fix up excess precision handling of scalar_to_vector conversion [PR107358]
As mentioned earlier in the C++ excess precision support mail, the following
testcase is broken with excess precision both in C and C++ (though just in C++
it was triggered in real-world code).
scalar_to_vector is called in both FEs after the excess precision promotions
(or stripping of EXCESS_PRECISION_EXPR), so we can then get invalid
diagnostics that say float vector + float involves truncation (on ia32
from long double to float).
The following patch fixes that by calling scalar_to_vector on the operands
before the excess precision promotions, let scalar_to_vector just do the
diagnostics (it does e.g. fold_for_warn so it will fold
EXCESS_PRECISION_EXPR around REAL_CST to constants etc.) but will then
do the actual conversions using the excess precision promoted operands
(so say if we have vector double + (float + float) we don't actually do
vector double + (float) ((long double) float + (long double) float)
but
vector double + (double) ((long double) float + (long double) float)
2022-10-24 Jakub Jelinek <jakub@redhat.com>
PR c++/107358
gcc/c/
* c-typeck.c (build_binary_op): Pass operands before excess precision
promotions to scalar_to_vector call.
gcc/testsuite/
* c-c++-common/pr107358.c: New test.
(cherry picked from commit 65e3274e363cb2c6bfe6b5e648916eb7696f7e2f)
Diff:
---
gcc/c/c-typeck.c | 4 ++--
gcc/testsuite/c-c++-common/pr107358.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index 53b86f37cad..84b44081f0e 100644
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -11764,8 +11764,8 @@ build_binary_op (location_t location, enum tree_code code,
if ((gnu_vector_type_p (type0) && code1 != VECTOR_TYPE)
|| (gnu_vector_type_p (type1) && code0 != VECTOR_TYPE))
{
- enum stv_conv convert_flag = scalar_to_vector (location, code, op0, op1,
- true);
+ enum stv_conv convert_flag = scalar_to_vector (location, code, orig_op0,
+ orig_op1, true);
switch (convert_flag)
{
diff --git a/gcc/testsuite/c-c++-common/pr107358.c b/gcc/testsuite/c-c++-common/pr107358.c
new file mode 100644
index 00000000000..d976da7393a
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr107358.c
@@ -0,0 +1,30 @@
+/* PR c++/107358 */
+/* { dg-do compile { target c } } */
+/* { dg-options "-O2 -fexcess-precision=standard" } */
+
+typedef float __attribute__((vector_size (4 * sizeof (float)))) A;
+typedef double __attribute__((vector_size (2 * sizeof (double)))) B;
+
+void
+foo (A *x)
+{
+ *x = *x - 124.225514990f;
+}
+
+void
+bar (A *x, float y)
+{
+ *x = *x - y;
+}
+
+void
+baz (B *x)
+{
+ *x = *x + 124.225514990f;
+}
+
+void
+qux (B *x, double y)
+{
+ *x = *x + y;
+}
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