[compiler-rt] 0729d00 - Reland "[compiler-rt][BF16] Provide __truncsfbf2 only when __bf16 is available"

[Phoebe Wang via llvm-commits]

Author: Phoebe Wang
Date: 2022-08-10T13:27:21+08:00
New Revision: 0729d00135ccbe1514a49168bbf26986823235c2

URL: https://github.com/llvm/llvm-project/commit/0729d00135ccbe1514a49168bbf26986823235c2
DIFF: https://github.com/llvm/llvm-project/commit/0729d00135ccbe1514a49168bbf26986823235c2.diff

LOG: Reland "[compiler-rt][BF16] Provide __truncsfbf2 only when __bf16 is available"

Disable the build on macOS due to the bot fail.

Reviewed By: bkramer

Differential Revision: https://reviews.llvm.org/D131147

Added: 
    

Modified: 
    compiler-rt/cmake/builtin-config-ix.cmake
    compiler-rt/lib/builtins/CMakeLists.txt
    compiler-rt/lib/builtins/fp_trunc.h
    compiler-rt/lib/builtins/truncdfbf2.c
    compiler-rt/lib/builtins/truncsfbf2.c

Removed: 
    


################################################################################
diff  --git a/compiler-rt/cmake/builtin-config-ix.cmake b/compiler-rt/cmake/builtin-config-ix.cmake
index 5aa2114fab93f..62e8281b919cf 100644
--- a/compiler-rt/cmake/builtin-config-ix.cmake
+++ b/compiler-rt/cmake/builtin-config-ix.cmake
@@ -30,6 +30,14 @@ _Float16 foo(_Float16 x) {
 "
 )
 
+builtin_check_c_compiler_source(COMPILER_RT_HAS_BFLOAT16
+"
+__bf16 foo(__bf16 x) {
+ return x;
+}
+"
+)
+
 builtin_check_c_compiler_source(COMPILER_RT_HAS_ASM_LSE
 "
 asm(\".arch armv8-a+lse\");

diff  --git a/compiler-rt/lib/builtins/CMakeLists.txt b/compiler-rt/lib/builtins/CMakeLists.txt
index 6143457cc9339..05c37930dae83 100644
--- a/compiler-rt/lib/builtins/CMakeLists.txt
+++ b/compiler-rt/lib/builtins/CMakeLists.txt
@@ -699,6 +699,8 @@ else ()
 
   append_list_if(COMPILER_RT_HAS_FLOAT16 -DCOMPILER_RT_HAS_FLOAT16 BUILTIN_CFLAGS)
 
+  append_list_if(COMPILER_RT_HAS_BFLOAT16 -DCOMPILER_RT_HAS_BFLOAT16 BUILTIN_CFLAGS)
+
   append_list_if(COMPILER_RT_HAS_STD_C11_FLAG -std=c11 BUILTIN_CFLAGS)
 
   # These flags would normally be added to CMAKE_C_FLAGS by the llvm

diff  --git a/compiler-rt/lib/builtins/fp_trunc.h b/compiler-rt/lib/builtins/fp_trunc.h
index 7a54564a3520a..91f614528ab3f 100644
--- a/compiler-rt/lib/builtins/fp_trunc.h
+++ b/compiler-rt/lib/builtins/fp_trunc.h
@@ -60,7 +60,7 @@ typedef uint16_t dst_rep_t;
 static const int dstSigBits = 10;
 
 #elif defined DST_BFLOAT
-typedef uint16_t dst_t;
+typedef __bf16 dst_t;
 typedef uint16_t dst_rep_t;
 #define DST_REP_C UINT16_C
 static const int dstSigBits = 7;

diff  --git a/compiler-rt/lib/builtins/truncdfbf2.c b/compiler-rt/lib/builtins/truncdfbf2.c
index dbd54dcd50caf..b87385eeaca05 100644
--- a/compiler-rt/lib/builtins/truncdfbf2.c
+++ b/compiler-rt/lib/builtins/truncdfbf2.c
@@ -6,8 +6,11 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if defined(COMPILER_RT_HAS_BFLOAT16)
 #define SRC_DOUBLE
 #define DST_BFLOAT
 #include "fp_trunc_impl.inc"
 
 COMPILER_RT_ABI dst_t __truncdfbf2(double a) { return __truncXfYf2__(a); }
+
+#endif

diff  --git a/compiler-rt/lib/builtins/truncsfbf2.c b/compiler-rt/lib/builtins/truncsfbf2.c
index 6bed116af9868..42ddab32a2f1c 100644
--- a/compiler-rt/lib/builtins/truncsfbf2.c
+++ b/compiler-rt/lib/builtins/truncsfbf2.c
@@ -6,8 +6,11 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if defined(COMPILER_RT_HAS_BFLOAT16)
 #define SRC_SINGLE
 #define DST_BFLOAT
 #include "fp_trunc_impl.inc"
 
 COMPILER_RT_ABI dst_t __truncsfbf2(float a) { return __truncXfYf2__(a); }
+
+#endif