[SystemZ] Extend memcpy and memset support to all constant lengths

Lengths up to a certain threshold (currently 6 * 256) use a series of MVCs.
Lengths above that threshold use a loop to handle X*256 bytes followed
by a single MVC to handle the excess (if any).  This loop will also be
needed in future when support for variable lengths is added.

Because the same tablegen classes are used to define MVC and CLC,
the patch also has the side-effect of defining a pseudo loop instruction
for CLC.  That instruction isn't used yet (and wouldn't be handled correctly
if it were).  I'm planning to use it soon though.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189331 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 6 deletions

diff --git a/lib/Target/SystemZ/SystemZOperands.td b/lib/Target/SystemZ/SystemZOperands.td
index eb96dba0f2..421e41f11e 100644
--- a/lib/Target/SystemZ/SystemZOperands.td
+++ b/lib/Target/SystemZ/SystemZOperands.td
@@ -219,11 +219,6 @@ def uimm8    : Immediate<i8, [{}], UIMM8, "U8Imm">;
 // i32 immediates
 //===----------------------------------------------------------------------===//
 
-// Immediates for 8-bit lengths.
-def imm32len8 : Immediate<i32, [{
-  return isUInt<8>(N->getZExtValue() - 1);
-}], NOOP_SDNodeXForm, "U32Imm">;
-
 // Immediates for the lower and upper 16 bits of an i32, with the other
 // bits of the i32 being zero.
 def imm32ll16 : Immediate<i32, [{
@@ -358,7 +353,7 @@ def imm64zx32n : Immediate<i64, [{
   return isUInt<32>(-N->getSExtValue());
 }], NEGIMM32, "U32Imm">;
 
-def imm64 : ImmLeaf<i64, [{}]>;
+def imm64 : ImmLeaf<i64, [{}]>, Operand<i64>;
 
 //===----------------------------------------------------------------------===//
 // Floating-point immediates