[libc][math][c++23] Add {ceil,floor,round,roundeven,trunc}bf16 math functions (#152352)

This PR implements the following basic math functions for BFloat16 type
along with the tests:
- ceilbf16
- floorbf16
- roundbf16
- roundevenbf16
- truncbf16

---------

Signed-off-by: Krishna Pandey <[email protected]>

Author: krishna2803

libc/config/baremetal/aarch64/entrypoints.txt

@@ -757,7 +757,12 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)

libc/config/baremetal/arm/entrypoints.txt

@@ -760,7 +760,12 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)

libc/config/baremetal/riscv/entrypoints.txt

@@ -760,7 +760,12 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)

libc/config/darwin/aarch64/entrypoints.txt

@@ -590,7 +590,12 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)

libc/config/darwin/x86_64/entrypoints.txt

@@ -233,7 +233,12 @@ set(TARGET_LIBM_ENTRYPOINTS
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS

libc/config/gpu/amdgpu/entrypoints.txt

@@ -616,7 +616,12 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS

libc/config/gpu/nvptx/entrypoints.txt

@@ -617,7 +617,12 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS

libc/config/linux/aarch64/entrypoints.txt

@@ -844,7 +844,12 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 if(LLVM_LIBC_FULL_BUILD)

libc/config/linux/arm/entrypoints.txt

@@ -460,7 +460,12 @@ set(TARGET_LIBM_ENTRYPOINTS
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 set(TARGET_LLVMLIBC_ENTRYPOINTS

libc/config/linux/riscv/entrypoints.txt

@@ -863,7 +863,12 @@ endif()
 
 list(APPEND TARGET_LIBM_ENTRYPOINTS
   # bfloat16 entrypoints
+  libc.src.math.ceilbf16
   libc.src.math.fabsbf16
+  libc.src.math.floorbf16
+  libc.src.math.roundbf16
+  libc.src.math.roundevenbf16
+  libc.src.math.truncbf16
 )
 
 if(LIBC_COMPILER_HAS_FIXED_POINT)