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ARM64: give MOV priority over shorter ORR when printing aliases.

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MOV is almost always the right thing to print if possile. People understand it.

This will be tested when the TableGen "should I print this Alias" heuristic is
fixed (very soon).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208958 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2014-05-16 09:41:03 +00:00
parent 7d80c1a8ac
commit 22f4151e3b
1 changed files with 17 additions and 11 deletions
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28
lib/Target/ARM64/ARM64InstrInfo.td
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@ -708,8 +708,23 @@ defm ORN : LogicalReg<0b01, 1, "orn",
BinOpFrag<(or node:$LHS, (not node:$RHS))>>;
defm ORR : LogicalReg<0b01, 0, "orr", or>;
def : InstAlias<"mov $dst, $src", (ORRWrs GPR32:$dst, WZR, GPR32:$src, 0)>;
def : InstAlias<"mov $dst, $src", (ORRXrs GPR64:$dst, XZR, GPR64:$src, 0)>;
// FIXME: these aliases are named so that they get considered by TableGen before
// the already instantiated anonymous_ABC ones. Some kind of explicit priority
// system would be better.
def AA_MOVWr : InstAlias<"mov $dst, $src",
(ORRWrs GPR32:$dst, WZR, GPR32:$src, 0)>;
def AA_MOVXr : InstAlias<"mov $dst, $src",
(ORRXrs GPR64:$dst, XZR, GPR64:$src, 0)>;
def AA_MVNWr : InstAlias<"mvn $Wd, $Wm",
(ORNWrs GPR32:$Wd, WZR, GPR32:$Wm, 0)>;
def AA_MVNXr : InstAlias<"mvn $Xd, $Xm",
(ORNXrs GPR64:$Xd, XZR, GPR64:$Xm, 0)>;
def AA_MVNWrs : InstAlias<"mvn $Wd, $Wm$sh",
(ORNWrs GPR32:$Wd, WZR, GPR32:$Wm, logical_shift32:$sh)>;
def AA_MVNXrs : InstAlias<"mvn $Xd, $Xm$sh",
(ORNXrs GPR64:$Xd, XZR, GPR64:$Xm, logical_shift64:$sh)>;
def : InstAlias<"tst $src1, $src2",
(ANDSWri WZR, GPR32:$src1, logical_imm32:$src2)>;
@ -726,15 +741,6 @@ def : InstAlias<"tst $src1, $src2, $sh",
def : InstAlias<"tst $src1, $src2, $sh",
(ANDSXrs XZR, GPR64:$src1, GPR64:$src2, logical_shift64:$sh)>;
def : InstAlias<"mvn $Wd, $Wm",
(ORNWrs GPR32:$Wd, WZR, GPR32:$Wm, 0)>;
def : InstAlias<"mvn $Xd, $Xm",
(ORNXrs GPR64:$Xd, XZR, GPR64:$Xm, 0)>;
def : InstAlias<"mvn $Wd, $Wm, $sh",
(ORNWrs GPR32:$Wd, WZR, GPR32:$Wm, logical_shift32:$sh)>;
def : InstAlias<"mvn $Xd, $Xm, $sh",
(ORNXrs GPR64:$Xd, XZR, GPR64:$Xm, logical_shift64:$sh)>;
def : Pat<(not GPR32:$Wm), (ORNWrr WZR, GPR32:$Wm)>;
def : Pat<(not GPR64:$Xm), (ORNXrr XZR, GPR64:$Xm)>;