[compiler-rt] compiler-rt/arm: Check for overflow when adding float denorms (PR #185245)

[Keith Packard via llvm-commits]

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@@ -113,6 +113,15 @@ LOCAL_LABEL(done_align):
   // aSignificand += bSignificand;
   adds r4, r4, r5
 
+  // Check for denorm result
+  cmp  r2, #0
+  bne  1f
+
+  // Add carry bit to exponent
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keith-packard wrote:

I've added `// branch if result is not denormal` to agree with the sense of the branch.

https://github.com/llvm/llvm-project/pull/185245