Division by pow-of-2 is not cheap on SPU, do it with

shifts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120022 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/CellSPU/SPUISelLowering.cpp b/lib/Target/CellSPU/SPUISelLowering.cpp
index 014fbbedb706373f6511aabed8914bf538f61b8b..0fa511eade3bca8ee10758e479d0f8205028ccea 100644 (file)
--- a/lib/Target/CellSPU/SPUISelLowering.cpp
+++ b/lib/Target/CellSPU/SPUISelLowering.cpp
@@ -97,8 +97,6 @@ namespace {
 SPUTargetLowering::SPUTargetLowering(SPUTargetMachine &TM)
   : TargetLowering(TM, new TargetLoweringObjectFileELF()),
     SPUTM(TM) {
-  // Fold away setcc operations if possible.
-  setPow2DivIsCheap();
 
   // Use _setjmp/_longjmp instead of setjmp/longjmp.
   setUseUnderscoreSetJmp(true);

diff --git a/test/CodeGen/CellSPU/div_ops.ll b/test/CodeGen/CellSPU/div_ops.ll
new file mode 100644 (file)
index 0000000..0c93d83
--- /dev/null
+++ b/test/CodeGen/CellSPU/div_ops.ll
@@ -0,0 +1,22 @@
+; RUN: llc --march=cellspu %s -o - | FileCheck %s
+
+; signed division rounds towards zero, rotma don't.
+define i32 @sdivide (i32 %val )
+{
+; CHECK: rotmai
+; CHECK: rotmi
+; CHECK: a
+; CHECK: rotmai
+; CHECK: bi $lr
+   %rv = sdiv i32 %val, 4
+   ret i32 %rv
+}
+
+define i32 @udivide (i32 %val )
+{
+; CHECK: rotmi
+; CHECK: bi $lr
+   %rv = udiv i32 %val, 4
+   ret i32 %rv
+}
+