[compiler-rt] 43d308d - [compiler-rt] Add support for big endian for Arm's __negdf2vfp (#127096)

[via llvm-commits]

Author: Victor Campos
Date: 2025-02-17T11:43:36Z
New Revision: 43d308dd0d9ef18d35ea6dcc9283fcbc93066820

URL: https://github.com/llvm/llvm-project/commit/43d308dd0d9ef18d35ea6dcc9283fcbc93066820
DIFF: https://github.com/llvm/llvm-project/commit/43d308dd0d9ef18d35ea6dcc9283fcbc93066820.diff

LOG: [compiler-rt] Add support for big endian for Arm's __negdf2vfp (#127096)

In soft floating-point ABI, this function takes the double argument as a
pair of registers r0 and r1.

The ordering of these two registers follow the endianness rules,
therefore the register on which the bit flipping must happen depends on
the endianness.

Added: 
    

Modified: 
    compiler-rt/lib/builtins/arm/negdf2vfp.S

Removed: 
    


################################################################################
diff  --git a/compiler-rt/lib/builtins/arm/negdf2vfp.S b/compiler-rt/lib/builtins/arm/negdf2vfp.S
index b7cf91877e38c..329c6de757f68 100644
--- a/compiler-rt/lib/builtins/arm/negdf2vfp.S
+++ b/compiler-rt/lib/builtins/arm/negdf2vfp.S
@@ -20,7 +20,11 @@ DEFINE_COMPILERRT_FUNCTION(__negdf2vfp)
 #if defined(COMPILER_RT_ARMHF_TARGET)
 	vneg.f64 d0, d0
 #else
-	eor	r1, r1, #-2147483648	// flip sign bit on double in r0/r1 pair
+#if _YUGA_BIG_ENDIAN
+	eor	r0, r0, #0x80000000	// flip sign bit on double in r0/r1 pair
+#else
+	eor	r1, r1, #0x80000000	// flip sign bit on double in r0/r1 pair
+#endif
 #endif
 	bx	lr
 END_COMPILERRT_FUNCTION(__negdf2vfp)