https://github.com/AaronBallman created https://github.com/llvm/llvm-project/pull/115332
This paper is defining the translation-time behavior of initialization with a signaling NaN. Clang has always supported the correct behavior. >From 60f4b4792fc0919de2e973b366d7c6379893e2a1 Mon Sep 17 00:00:00 2001 From: Aaron Ballman <aa...@aaronballman.com> Date: Thu, 7 Nov 2024 10:50:47 -0500 Subject: [PATCH] [C2y] Add conformance test for WG14 N3364 This paper is defining the translation-time behavior of initialization with a signaling NaN. Clang has always supported the correct behavior. --- clang/docs/ReleaseNotes.rst | 5 +++++ clang/test/C/C2y/n3364.c | 35 +++++++++++++++++++++++++++++++++++ clang/www/c_status.html | 2 +- 3 files changed, 41 insertions(+), 1 deletion(-) create mode 100644 clang/test/C/C2y/n3364.c diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 3e7d8e15110f9d..ae0ec259cf52c2 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -286,6 +286,11 @@ C2y Feature Support language modes but is now rejected (all of the other qualifiers and storage class specifiers were previously rejected). +- Updated conformance for `N3364 <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3364.pdf>`_ + on floating-point translation-time initialization with signaling NaN. This + paper adopts Clang's existing practice, so there were no changes to compiler + behavior. + C23 Feature Support ^^^^^^^^^^^^^^^^^^^ diff --git a/clang/test/C/C2y/n3364.c b/clang/test/C/C2y/n3364.c new file mode 100644 index 00000000000000..277b2643edd6bc --- /dev/null +++ b/clang/test/C/C2y/n3364.c @@ -0,0 +1,35 @@ +// RUN: %clang_cc1 -verify -std=c2y -Wall -pedantic -emit-llvm -o - %s +// RUN: %clang_cc1 -verify -Wall -pedantic -emit-llvm -o - %s +// expected-no-diagnostics + +/* WG14 N3364: Yes + * Give consistent wording for SNAN initialization v3 + * + * Ensure that initializing from a signaling NAN (optionally with a unary + or + * -) at translation time behaves correctly at runtime. + */ + +#define FLT_SNAN __builtin_nansf("1") +#define DBL_SNAN __builtin_nans("1") +#define LD_SNAN __builtin_nansl("1") + +float f1 = FLT_SNAN; +float f2 = +FLT_SNAN; +float f3 = -FLT_SNAN; +// CHECK: @f1 = {{.*}}global float 0x7FF0000020000000 +// CHECK: @f2 = {{.*}}global float 0x7FF0000020000000 +// CHECK: @f3 = {{.*}}global float 0xFFF0000020000000 + +double d1 = DBL_SNAN; +double d2 = +DBL_SNAN; +double d3 = -DBL_SNAN; +// CHECK: @d1 = {{.*}}global double 0x7FF0000000000001 +// CHECK: @d2 = {{.*}}global double 0x7FF0000000000001 +// CHECK: @d3 = {{.*}}global double 0xFFF0000000000001 + +long double ld1 = LD_SNAN; +long double ld2 = +LD_SNAN; +long double ld3 = -LD_SNAN; +// CHECK: @ld1 = {{.*}}global {{double 0x7FF0000000000001|x86_fp80 0xK7FFF8000000000000001|fp128 0xL00000000000000017FFF000000000000}} +// CHECK: @ld2 = {{.*}}global {{double 0x7FF0000000000001|x86_fp80 0xK7FFF8000000000000001|fp128 0xL00000000000000017FFF000000000000}} +// CHECK: @ld3 = {{.*}}global {{double 0xFFF0000000000001|x86_fp80 0xKFFFF8000000000000001|fp128 0xL0000000000000001FFFF000000000000}} diff --git a/clang/www/c_status.html b/clang/www/c_status.html index e66424290e6d50..989a572ae70fb6 100644 --- a/clang/www/c_status.html +++ b/clang/www/c_status.html @@ -231,7 +231,7 @@ <h2 id="c2y">C2y implementation status</h2> <tr> <td>Give consistent wording for SNAN initialization v3</td> <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3364.pdf";>N3364</a></td> - <td class="unknown" align="center">Unknown</td> + <td class="full" align="center">Yes</td> </tr> <tr> <td>Case range expressions v3.1</td> _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
