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[WebAssembly] Add a TODO comment for a possible future optimization.
author
Dan Gohman
<dan433584@gmail.com>
Wed, 23 Dec 2015 00:22:04 +0000
(
00:22
+0000)
committer
Dan Gohman
<dan433584@gmail.com>
Wed, 23 Dec 2015 00:22:04 +0000
(
00:22
+0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256306
91177308
-0d34-0410-b5e6-
96231b3b80d8
lib/Target/WebAssembly/WebAssemblyRegNumbering.cpp
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diff --git
a/lib/Target/WebAssembly/WebAssemblyRegNumbering.cpp
b/lib/Target/WebAssembly/WebAssemblyRegNumbering.cpp
index
0a94533
..
f621db0
100644
(file)
--- a/
lib/Target/WebAssembly/WebAssemblyRegNumbering.cpp
+++ b/
lib/Target/WebAssembly/WebAssemblyRegNumbering.cpp
@@
-82,7
+82,8
@@
bool WebAssemblyRegNumbering::runOnMachineFunction(MachineFunction &MF) {
}
// Then assign regular WebAssembly registers for all remaining used
- // virtual registers.
+ // virtual registers. TODO: Consider sorting the registers by frequency of
+ // use, to maximize usage of small immediate fields.
unsigned NumArgRegs = MFI.getParams().size();
unsigned NumVRegs = MF.getRegInfo().getNumVirtRegs();
unsigned NumStackRegs = 0;