[libunwind] NFC: Use macros to accommodate differences in representation of PowerPC assemblers
Summary:
This NFC patch replaces the representation of registers and the left shift operator in the PowerPC assembly code to allow it to be consumed by the GNU flavored assembler and the AIX assembler.
* Registers - change the representation of PowperPC registers from %rn, %fn, %vsn, and %vrn to the register number alone, e.g., n. The GNU flavored assembler and the AIX assembler are able to determine the register kind based on the context of the instruction in which the register is used.
* Left shift operator - use macro PPC_LEFT_SHIFT to represent the left shift operator. The left shift operator in the AIX assembly language is < instead of <<
Reviewed by: sfertile, MaskRay, compnerd
Differential Revision: https://reviews.llvm.org/D101179
NOKEYCHECK=True
GitOrigin-RevId: 8408d3f2d814b19da450ff162f47981b55a9703a
diff --git a/src/assembly.h b/src/assembly.h
index f5ca35c..76ef825 100644
--- a/src/assembly.h
+++ b/src/assembly.h
@@ -216,4 +216,8 @@
#endif
#endif /* __arm__ */
+#if defined(__ppc__) || defined(__powerpc64__)
+#define PPC_LEFT_SHIFT(index) << (index)
+#endif
+
#endif /* UNWIND_ASSEMBLY_H */