rust: compiler_builtins: __subsf3 for ppc64le

    powerpc64le-linux-gnu-ld: rust/core.o: in function `<core::core_arch::powerpc::altivec::vector_float as core::ops::arith::Neg>::neg':
    core.bd923ab8a410e564-cgu.0:(.text+0x2a5b8): undefined reference to `__subsf3'

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

rust/Makefile

@@ -396,7 +396,7 @@ rust-analyzer:
 		$(RUST_LIB_SRC) > $(objtree)/rust-project.json
 
 redirect-intrinsics = \
-	__addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \
+	__addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __subsf3 __unordsf2 \
 	__adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \
 	__muloti4 __multi3 \
 	__udivmodti4 __udivti3 __umodti3 \

rust/compiler_builtins.rs

@@ -44,6 +44,7 @@ define_panicking_intrinsics!("`f32` should not be used", {
     __ltsf2,
     __mulsf3,
     __nesf2,
+    __subsf3,
     __unordsf2,
 });