[llvm] [InferAttrs] Handle roundeven like other libm functions (PR #170691)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: None (valadaptive)

<details>
<summary>Changes</summary>

It was previously missing entirely. It behaves like floor, ceil, round,
and trunc, having no side effects.


---
Full diff: https://github.com/llvm/llvm-project/pull/170691.diff


2 Files Affected:

- (modified) llvm/lib/Transforms/Utils/BuildLibCalls.cpp (+3) 
- (modified) llvm/test/Transforms/InferFunctionAttrs/annotate.ll (+9) 


``````````diff
diff --git a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
index 02b73e85d783f..e6642cad189cd 100644
--- a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
@@ -1361,6 +1361,9 @@ bool llvm::inferNonMandatoryLibFuncAttrs(Function &F,
   case LibFunc_nearbyint:
   case LibFunc_nearbyintf:
   case LibFunc_nearbyintl:
+  case LibFunc_roundeven:
+  case LibFunc_roundevenf:
+  case LibFunc_roundevenl:
   case LibFunc_toascii:
   case LibFunc_trunc:
   case LibFunc_truncf:
diff --git a/llvm/test/Transforms/InferFunctionAttrs/annotate.ll b/llvm/test/Transforms/InferFunctionAttrs/annotate.ll
index 25a70a026a0b7..555262559e24d 100644
--- a/llvm/test/Transforms/InferFunctionAttrs/annotate.ll
+++ b/llvm/test/Transforms/InferFunctionAttrs/annotate.ll
@@ -918,6 +918,15 @@ declare float @roundf(float)
 ; CHECK: declare x86_fp80 @roundl(x86_fp80) [[ERRNOMEMONLY_NOFREE_NOUNWIND_WILLRETURN:#[0-9]+]]
 declare x86_fp80 @roundl(x86_fp80)
 
+; CHECK: declare double @roundeven(double) [[MEMNONE_NOFREE_NOUNWIND_WILLRETURN:#[0-9]+]]
+declare double @roundeven(double)
+
+; CHECK: declare float @roundevenf(float) [[MEMNONE_NOFREE_NOUNWIND_WILLRETURN:#[0-9]+]]
+declare float @roundevenf(float)
+
+; CHECK: declare x86_fp80 @roundevenl(x86_fp80) [[MEMNONE_NOFREE_NOUNWIND_WILLRETURN:#[0-9]+]]
+declare x86_fp80 @roundevenl(x86_fp80)
+
 ; CHECK: declare double @scalbln(double, i64) [[ERRNOMEMONLY_NOFREE_NOUNWIND_WILLRETURN:#[0-9]+]]
 declare double @scalbln(double, i64)
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/170691