rename option nvptx-rsqrt-approx-opt

Author: AlexMaclean

llvm/lib/Target/NVPTX/NVPTXISelDAGToDAG.cpp

@@ -31,8 +31,8 @@ using namespace llvm;
 #define PASS_NAME "NVPTX DAG->DAG Pattern Instruction Selection"
 
 static cl::opt<bool>
-    DisableRsqrtOpt("nvptx-disable-rsqrt-opt", cl::init(false), cl::Hidden,
-                    cl::desc("Disable reciprocal sqrt optimization"));
+    EnableRsqrtOpt("nvptx-rsqrt-approx-opt", cl::init(true), cl::Hidden,
+                   cl::desc("Enable reciprocal sqrt optimization"));
 
 /// createNVPTXISelDag - This pass converts a legalized DAG into a
 /// NVPTX-specific DAG, ready for instruction scheduling.
@@ -78,7 +78,7 @@ bool NVPTXDAGToDAGISel::allowUnsafeFPMath() const {
   return TL->allowUnsafeFPMath(*MF);
 }
 
-bool NVPTXDAGToDAGISel::doRsqrtOpt() const { return !DisableRsqrtOpt; }
+bool NVPTXDAGToDAGISel::doRsqrtOpt() const { return EnableRsqrtOpt; }
 
 /// Select - Select instructions not customized! Used for
 /// expanded, promoted and normal instructions.

llvm/test/CodeGen/NVPTX/rsqrt-opt.ll

@@ -1,10 +1,10 @@
 ; RUN: llc < %s -march=nvptx64 | FileCheck %s --check-prefixes CHECK,CHECK-APPROX-OPT,CHECK-SQRT-NOOPT
 ; RUN: llc < %s -march=nvptx64 -nvptx-prec-sqrtf32=0 | FileCheck %s --check-prefixes CHECK,CHECK-APPROX-OPT,CHECK-SQRT-OPT
-; RUN: llc < %s -march=nvptx64 -nvptx-disable-rsqrt-opt | FileCheck %s --check-prefixes CHECK,CHECK-APPROX-NOOPT,CHECK-SQRT-NOOPT
+; RUN: llc < %s -march=nvptx64 -nvptx-rsqrt-approx-opt=0 | FileCheck %s --check-prefixes CHECK,CHECK-APPROX-NOOPT,CHECK-SQRT-NOOPT
 ;
 ; RUN: %if ptxas %{ llc < %s -march=nvptx64 | %ptxas-verify %}
 ; RUN: %if ptxas %{ llc < %s -march=nvptx64 -nvptx-prec-sqrtf32=0 | %ptxas-verify %}
-; RUN: %if ptxas %{ llc < %s -march=nvptx64 -nvptx-disable-rsqrt-opt | %ptxas-verify %}
+; RUN: %if ptxas %{ llc < %s -march=nvptx64 -nvptx-rsqrt-approx-opt=0 | %ptxas-verify %}
 
 
 ; CHECK-LABEL: .func{{.*}}test1