https://gcc.gnu.org/g:f7b7fe16579ac13d7fd48e7f9a6082778a0a99f7
commit r15-6885-gf7b7fe16579ac13d7fd48e7f9a6082778a0a99f7 Author: Andrew Pinski <quic_apin...@quicinc.com> Date: Mon Jan 13 10:14:45 2025 -0800 c++: Add support for vec_dup to constexpr [PR118445] With the addition of supporting operations on the SVE scalable vector types, the vec_duplicate tree will show up in expressions and the constexpr handling was not done for this tree code. This is a simple fix to treat VEC_DUPLICATE like any other unary operator and allows the constexpr-add-1.C testcase to work. Built and tested for aarch64-linux-gnu. PR c++/118445 gcc/cp/ChangeLog: * constexpr.cc (cxx_eval_constant_expression): Handle VEC_DUPLICATE like a "normal" unary operator. (potential_constant_expression_1): Likewise. gcc/testsuite/ChangeLog: * g++.target/aarch64/sve/constexpr-add-1.C: New test. Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com> Diff: --- gcc/cp/constexpr.cc | 2 ++ gcc/testsuite/g++.target/aarch64/sve/constexpr-add-1.C | 16 ++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/gcc/cp/constexpr.cc b/gcc/cp/constexpr.cc index 1345bc124efb..0896576fd28e 100644 --- a/gcc/cp/constexpr.cc +++ b/gcc/cp/constexpr.cc @@ -8005,6 +8005,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t, case BIT_NOT_EXPR: case TRUTH_NOT_EXPR: case FIXED_CONVERT_EXPR: + case VEC_DUPLICATE_EXPR: r = cxx_eval_unary_expression (ctx, t, lval, non_constant_p, overflow_p); break; @@ -10344,6 +10345,7 @@ potential_constant_expression_1 (tree t, bool want_rval, bool strict, bool now, case UNARY_PLUS_EXPR: case UNARY_LEFT_FOLD_EXPR: case UNARY_RIGHT_FOLD_EXPR: + case VEC_DUPLICATE_EXPR: unary: return RECUR (TREE_OPERAND (t, 0), rval); diff --git a/gcc/testsuite/g++.target/aarch64/sve/constexpr-add-1.C b/gcc/testsuite/g++.target/aarch64/sve/constexpr-add-1.C new file mode 100644 index 000000000000..43489560c8a8 --- /dev/null +++ b/gcc/testsuite/g++.target/aarch64/sve/constexpr-add-1.C @@ -0,0 +1,16 @@ +/* { dg-do compile } */ + +/* PR C++/118445 */ + +#include <arm_sve.h> + +/* See if constexpr handles VEC_DUPLICATE and SVE. */ +constexpr svfloat32_t f(svfloat32_t b, float a) +{ + return b + a; +} + +svfloat32_t g(void) +{ + return f((svfloat32_t){1.0}, 2.0); +}