let strictfp only work for libm

Author: diggerlin

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -9392,7 +9392,9 @@ bool SelectionDAGBuilder::visitStrNLenCall(const CallInst &I) {
 bool SelectionDAGBuilder::visitUnaryFloatCall(const CallInst &I,
                                               unsigned Opcode) {
   // We already checked this call's prototype; verify it doesn't modify errno.
-  if (!I.onlyReadsMemory())
+  // Do not perform optimizations for call sites that require strict
+  // floating-point semantics.
+  if (!I.onlyReadsMemory() || I.isStrictFP())
     return false;
 
   SDNodeFlags Flags;
@@ -9412,7 +9414,9 @@ bool SelectionDAGBuilder::visitUnaryFloatCall(const CallInst &I,
 bool SelectionDAGBuilder::visitBinaryFloatCall(const CallInst &I,
                                                unsigned Opcode) {
   // We already checked this call's prototype; verify it doesn't modify errno.
-  if (!I.onlyReadsMemory())
+  // Do not perform optimizations for call sites that require strict
+  // floating-point semantics.
+  if (!I.onlyReadsMemory() || I.isStrictFP())
     return false;
 
   SDNodeFlags Flags;
@@ -9445,11 +9449,10 @@ void SelectionDAGBuilder::visitCall(const CallInst &I) {
 
     // Check for well-known libc/libm calls.  If the function is internal, it
     // can't be a library call.  Don't do the check if marked as nobuiltin for
-    // some reason or the call site requires strict floating point semantics.
+    // some reason.
     LibFunc Func;
-    if (!I.isNoBuiltin() && !I.isStrictFP() && !F->hasLocalLinkage() &&
-        F->hasName() && LibInfo->getLibFunc(*F, Func) &&
-        LibInfo->hasOptimizedCodeGen(Func)) {
+    if (!I.isNoBuiltin() && !F->hasLocalLinkage() && F->hasName() &&
+        LibInfo->getLibFunc(*F, Func) && LibInfo->hasOptimizedCodeGen(Func)) {
       switch (Func) {
       default: break;
       case LibFunc_bcmp:

llvm/test/CodeGen/PowerPC/milicode32.ll

@@ -64,8 +64,9 @@ entry:
   %str.addr = alloca ptr, align 4
   store ptr %str, ptr %str.addr, align 4
   %0 = load ptr, ptr %str.addr, align 4
-  %call = call i32 @strlen(ptr noundef %0)
+  %call = call i32 @strlen(ptr noundef %0) #0
   ret i32 %call
 }
 
 declare i32 @strlen(ptr noundef) nounwind
+attributes #0 = { strictfp }