In LLVM FMA3 operands are dst, src1, src2, src3, however dst is not encoded as it...

Patch by Chris Bieneman.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188866 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86CodeEmitter.cpp b/lib/Target/X86/X86CodeEmitter.cpp
index 5d72b4469eaf01569e99693e1b8bb117778231c9..0f9c562eb50bc635018387be5f434bb2fc393832 100644 (file)
--- a/lib/Target/X86/X86CodeEmitter.cpp
+++ b/lib/Target/X86/X86CodeEmitter.cpp
@@ -985,8 +985,14 @@ void Emitter<CodeEmitter>::emitVEXOpcodePrefix(uint64_t TSFlags,
       if (X86II::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
         VEX_R = 0x0;
 
-      if (HasVEX_4V)
-        VEX_4V = getVEXRegisterEncoding(MI, 1);
+      if (HasVEX_4V) {
+        if (HasMemOp4)
+          VEX_4V = getVEXRegisterEncoding(MI, 1);
+        else
+          // FMA3 instructions operands are dst, src1, src2, src3
+          // dst and src1 are the same and not encoded separately
+          VEX_4V = getVEXRegisterEncoding(MI, 2);
+      }
 
       if (X86II::isX86_64ExtendedReg(
                           MI.getOperand(MemOperand+X86::AddrBaseReg).getReg()))

diff --git a/test/ExecutionEngine/fma3-jit.ll b/test/ExecutionEngine/fma3-jit.ll
new file mode 100644 (file)
index 0000000..25eaa65
--- /dev/null
+++ b/test/ExecutionEngine/fma3-jit.ll
@@ -0,0 +1,18 @@
+; RUN: %lli %s | FileCheck %s
+; REQUIRES: fma3
+; CHECK: 12.000000
+
+@msg_double = internal global [4 x i8] c"%f\0A\00"
+
+declare i32 @printf(i8*, ...)
+
+define i32 @main() {
+  %fma = tail call double @llvm.fma.f64(double 3.0, double 3.0, double 3.0) nounwind readnone
+
+  %ptr1 = getelementptr [4 x i8]* @msg_double, i32 0, i32 0
+  call i32 (i8*,...)* @printf(i8* %ptr1, double %fma)
+
+  ret i32 0
+}
+
+declare double @llvm.fma.f64(double, double, double) nounwind readnone