[PATCH] D48552: [Power9] Add __float128 library call for frem

[Stefan Pintilie via Phabricator via llvm-commits]

stefanp created this revision.
stefanp added reviewers: nemanjai, kbarton, hfinkel, sfertile, syzaara, lei.

We do not have a hardware instruction for `frem` but we can call `fmodf128` from libm.


https://reviews.llvm.org/D48552

Files:
  lib/Target/PowerPC/PPCISelLowering.cpp
  test/CodeGen/PowerPC/f128-arith.ll


Index: test/CodeGen/PowerPC/f128-arith.ll
===================================================================
--- test/CodeGen/PowerPC/f128-arith.ll
+++ test/CodeGen/PowerPC/f128-arith.ll
@@ -175,3 +175,17 @@
 ; CHECK: xscvdpqp
 ; CHECK: blr
 }
+
+ at a = common global fp128 0xL00000000000000000000000000000000, align 16
+ at b = common global fp128 0xL00000000000000000000000000000000, align 16
+
+define fp128 @qp_frem() #0 {
+entry:
+  %0 = load fp128, fp128* @a, align 16
+  %1 = load fp128, fp128* @b, align 16
+  %rem = frem fp128 %0, %1
+  ret fp128 %rem
+; CHECK-LABEL: qp_frem
+; CHECK: bl fmodf128
+; CHECK: blr
+}
Index: lib/Target/PowerPC/PPCISelLowering.cpp
===================================================================
--- lib/Target/PowerPC/PPCISelLowering.cpp
+++ lib/Target/PowerPC/PPCISelLowering.cpp
@@ -823,6 +823,7 @@
         setOperationAction(ISD::FCOS , MVT::f128, Expand);
         setOperationAction(ISD::FPOW, MVT::f128, Expand);
         setOperationAction(ISD::FPOWI, MVT::f128, Expand);
+        setOperationAction(ISD::FREM, MVT::f128, Expand);
       }
 
     }
@@ -1059,6 +1060,7 @@
     setLibcallName(RTLIB::FMIN_F128, "fminf128");
     setLibcallName(RTLIB::FMAX_F128, "fmaxf128");
     setLibcallName(RTLIB::POWI_F128, "__powikf2");
+    setLibcallName(RTLIB::REM_F128, "fmodf128");
   }
 
   // Darwin long double math library functions have $LDBL128 appended.


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