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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues_text/target_missing/host_missing/accel_missing/1788
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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+Floating point rounding fails on mps3-an547 amd cortex-m55 while using LLVM-embedded-toolchain-for-Arm and Picolibic.
+Description of problem:
+Rounding of long double gives unexpected result. Simple code as example:
+```
+#include <math.h>
+int main(void)
+{
+  long double value = -8.5L;
+  long rounded_value = lrintl(value);
+  if( -8 == rounded_value )
+  {
+    return 0;
+  }
+  return 1;
+}
+```
+Steps to reproduce:
+1. Checkout project: [LLVM-embedded-toolchain-for-ARM](https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm)
+2. Configure it with option -DLLVM_TOOLCHAIN_LIBRARY_VARIANTS=armv8.1m.main_hard_nofp_mve 
+3. Build project
+4. Run Picolbic tests with ninja picolibc_armv8.1m.main_hard_nofp_mve-test
+
+As a result long_double test fails with incorrect rounding.
+Last qemu version which successfully execute mentioned test is: qemu 7.0.0 downloaded via [qemu-7.0.0](https://download.qemu.org/qemu-7.0.0.tar.bz2). 
+Issue is present since qemu version 7.1.
+Additional information:
+As a result long_double test fails with incorrect rounding.
+Last qemu version which successfully execute mentioned test is: qemu 7.0.0 downloaded via [qemu-7.0.0](https://download.qemu.org/qemu-7.0.0.tar.bz2). 
+Issue is present since qemu version 7.1.