diff mbox series

[committed] arm: correctly define __ARM_FEATURE_CLZ

Message ID 20221219150626.2972660-1-rearnsha@arm.com
State New
Headers show
Series [committed] arm: correctly define __ARM_FEATURE_CLZ | expand

Commit Message

Richard Earnshaw Dec. 19, 2022, 3:06 p.m. UTC 
The ACLE requires that __ARM_FEATURE_CLZ be defined if the hardware
supports it; it's also clear that this doesn't mean the current ISA,
so we must define this even when compiling for Thumb1 if the target
supports CLZ in A32.

This brings GCC into alignment with Clang.

gcc/ChangeLog:

	* config/arm/arm-c.cc (__ARM_FEATURE_CLZ): Fix definition of
	preprocessor macro when target has CLZ in another ISA.
---
 gcc/config/arm/arm-c.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/gcc/config/arm/arm-c.cc b/gcc/config/arm/arm-c.cc
index 86c56bf2680..202898fa041 100644
--- a/gcc/config/arm/arm-c.cc
+++ b/gcc/config/arm/arm-c.cc
@@ -238,8 +238,12 @@  arm_cpu_builtins (struct cpp_reader* pfile)
     builtin_define_with_int_value ("__ARM_FEATURE_LDREX",
 				   TARGET_ARM_FEATURE_LDREX);
 
+  /* ACLE says that __ARM_FEATURE_CLZ is defined if the hardware
+     supports it; it's also clear that this doesn't mean the current
+     ISA, so we define this even when compiling for Thumb1 if the
+     target supports CLZ in A32.  */
   def_or_undef_macro (pfile, "__ARM_FEATURE_CLZ",
-		      ((TARGET_ARM_ARCH >= 5 && !TARGET_THUMB)
+		      ((TARGET_ARM_ARCH >= 5 && arm_arch_notm)
 		       || TARGET_ARM_ARCH_ISA_THUMB >=2));
 
   def_or_undef_macro (pfile, "__ARM_FEATURE_NUMERIC_MAXMIN",