commit 3964fe0f5e6622f68cc9059358b08e1fd7cc4d36
author Dave Rodgman <dave.rodgman@arm.com> Thu May 25 18:53:57 2023 +0100
committer Dave Rodgman <dave.rodgman@arm.com> Thu May 25 18:53:57 2023 +0100
tree 48f8141f872db5082f2cc0d971f5ecff5c26a451
parent 12b14b2c977c5671690507ed819ea11babf4c59e

Improve ISA detection

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>

library/bn_mul.h

diff --git a/library/bn_mul.h b/library/bn_mul.h
index 2aea1e8..83b65cd 100644
--- a/library/bn_mul.h
+++ b/library/bn_mul.h
@@ -660,7 +660,8 @@
 
 #if defined(__arm__)
 
-#if defined(__thumb__) && !defined(__thumb2__) && !defined(__ARMCC_VERSION)
+#if defined(__thumb__) && !defined(__thumb2__)
+#if !defined(__ARMCC_VERSION)
 /*
  * Thumb 1 ISA. This code path does not work on armclang.
  */
@@ -745,10 +746,13 @@
          : "r0", "r1", "r2", "r3", "r4", "r5",  \
            "r6", MULADDC_SCRATCH_CLOBBER, "r8", "r9", "cc" \
          );
+#endif /* !defined(__ARMCC_VERSION) */
 
 #elif (__ARM_ARCH >= 6) && \
     defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
-/* Armv6-M with DSP Instruction Set Extensions */
+/* Armv6-M (or later) with DSP Instruction Set Extensions.
+ * Requires support for either Thumb 2 or Arm ISA.
+ */
 
 #define MULADDC_X1_INIT                            \
     {                                              \
@@ -813,7 +817,7 @@
         );                                                   \
     }
 
-#elif defined(__thumb2__) || !defined(__thumb__)
+#else
 /* Thumb 2 or Arm ISA, without DSP extensions */
 
 #define MULADDC_X1_INIT                                 \