Don't generate floating point stubs for mips16 code if the function

is actually an instrinsic that will not occur in libc. This list here
is not exhaustive but fixes the one places in test-suite where this occurs.
I have filed a bug against myself to research the full list and add them
to the array of such cases. In the future, actual stub generation will occur
in a later phase and we won't need this code because we will know at that time
during the compilation that in fact no helper function was even needed.

llvm-svn: 188149

2 files changed, 38 insertions, 1 deletions

diff --git a/llvm/lib/Target/Mips/Mips16HardFloat.cpp b/llvm/lib/Target/Mips/Mips16HardFloat.cpp
index 7e456aa6d1e..7374636b833 100644
--- a/llvm/lib/Target/Mips/Mips16HardFloat.cpp
+++ b/llvm/lib/Target/Mips/Mips16HardFloat.cpp
@@ -16,6 +16,7 @@
 #include "llvm/IR/Module.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
+#include <algorithm>
 #include <string>
 
 static void inlineAsmOut
@@ -321,6 +322,17 @@ static void assureFPCallStub(Function &F, Module *M,
 }
 
 //
+// Functions that are inline intrinsics don't need helpers.
+//
+std::string IntrinsicInline[] =
+  {"fabs"};
+
+bool isIntrinsicInline(Function *F) {
+  return std::binary_search(
+    IntrinsicInline, array_endof(IntrinsicInline),
+    F->getName());
+}
+//
 // Returns of float, double and complex need to be handled with a helper
 // function.
 //
@@ -372,7 +384,7 @@ static bool fixupFPReturnAndCall
           // helper functions
           if (Subtarget.getRelocationModel() != Reloc::PIC_ ) {
             Function *F_ =  CI->getCalledFunction();
-            if (F_ && needsFPHelperFromSig(*F_)) {
+            if (F_ && !isIntrinsicInline(F_) && needsFPHelperFromSig(*F_)) {
               assureFPCallStub(*F_, M, Subtarget);
               Modified=true;
             }
diff --git a/llvm/test/CodeGen/Mips/f16abs.ll b/llvm/test/CodeGen/Mips/f16abs.ll
new file mode 100644
index 00000000000..fe3795770b2
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/f16abs.ll
@@ -0,0 +1,25 @@
+; RUN: llc -mtriple=mipsel-linux-gnu -march=mipsel -mcpu=mips16 -soft-float -mips16-hard-float -relocation-model=static < %s | FileCheck %s -check-prefix=static
+
+@y = global double -1.450000e+00, align 8
+@x = common global double 0.000000e+00, align 8
+
+; Function Attrs: nounwind optsize
+define i32 @main() #0 {
+entry:
+  %0 = load double* @y, align 8
+  %call = tail call double @fabs(double %0) #2
+  store double %call, double* @x, align 8
+; static-NOT: 	.ent	__call_stub_fp_fabs
+; static-NOT: 	jal fabs
+  ret i32 0
+}
+
+; Function Attrs: nounwind optsize readnone
+declare double @fabs(double) #1
+
+attributes #0 = { nounwind optsize "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="true" }
+attributes #1 = { nounwind optsize readnone "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="true" }
+attributes #2 = { nounwind optsize readnone }
+
+
+