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| author | Heejin Ahn <aheejin@gmail.com> | 2019-04-23 21:30:30 +0000 |
|---|---|---|
| committer | Heejin Ahn <aheejin@gmail.com> | 2019-04-23 21:30:30 +0000 |
| commit | b9f282d384fc9b94734ffdf5e505b772a889b214 (patch) | |
| tree | 5e746f5fd877a49ba60356da4cf061a2f4986491 /llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp | |
| parent | a746f2b73c39c2043cb75cd4210f87c2b3e347cc (diff) | |
| download | bcm5719-llvm-b9f282d384fc9b94734ffdf5e505b772a889b214.tar.gz bcm5719-llvm-b9f282d384fc9b94734ffdf5e505b772a889b214.zip | |
[WebAssembly] Emit br_table for most switch instructions
Summary:
Always convert switches to br_tables unless there is only one case,
which is equivalent to a simple branch. This reduces code size for wasm,
and we defer possible jump table optimizations to the VM.
Addresses PR41502.
Reviewers: kripken, sunfish
Subscribers: dschuff, sbc100, jgravelle-google, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D60966
llvm-svn: 359038
Diffstat (limited to 'llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp index 7bad4972c4f..105b1360ac2 100644 --- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp +++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp @@ -270,6 +270,11 @@ WebAssemblyTargetLowering::WebAssemblyTargetLowering( MaxStoresPerMemset = 1; MaxStoresPerMemsetOptSize = 1; } + + // Always convert switches to br_tables unless there is only one case, which + // is equivalent to a simple branch. This reduces code size for wasm, and we + // defer possible jump table optimizations to the VM. + setMinimumJumpTableEntries(2); } TargetLowering::AtomicExpansionKind |
