[llvm] 1c72c90 - [InferAttrs] Handle roundeven like other libm functions (#170691)

[via llvm-commits]

Author: valadaptive
Date: 2025-12-04T17:50:19Z
New Revision: 1c72c90b8acd2069588eba0c568d5ffa2f6db2e9

URL: https://github.com/llvm/llvm-project/commit/1c72c90b8acd2069588eba0c568d5ffa2f6db2e9
DIFF: https://github.com/llvm/llvm-project/commit/1c72c90b8acd2069588eba0c568d5ffa2f6db2e9.diff

LOG: [InferAttrs] Handle roundeven like other libm functions (#170691)

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

Added: 
    

Modified: 
    llvm/lib/Transforms/Utils/BuildLibCalls.cpp
    llvm/test/Transforms/InferFunctionAttrs/annotate.ll

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
index 213869fb993d7..05c882da38d61 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_round:
   case LibFunc_roundf:
   case LibFunc_roundl:
+  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 4a0a20b71dfde..f5020a93250ea 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) [[MEMNONE_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)