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| author | Dan Gohman <dan433584@gmail.com> | 2015-12-14 22:37:23 +0000 |
|---|---|---|
| committer | Dan Gohman <dan433584@gmail.com> | 2015-12-14 22:37:23 +0000 |
| commit | a712a6c4ce53588b1ee332b3cc1e14ed6d015f38 (patch) | |
| tree | 347e4da40d8f45aa03de2ec134382238fffa359b /llvm/lib/Target/WebAssembly | |
| parent | db9a91e32466b7f99fdf7f198d8b736f216bb34d (diff) | |
| download | bcm5719-llvm-a712a6c4ce53588b1ee332b3cc1e14ed6d015f38.tar.gz bcm5719-llvm-a712a6c4ce53588b1ee332b3cc1e14ed6d015f38.zip | |
[WebAssembly] Avoid adding redundant EXPR_STACK uses.
llvm-svn: 255563
Diffstat (limited to 'llvm/lib/Target/WebAssembly')
| -rw-r--r-- | llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp index d890310ac50..0b04a6355a9 100644 --- a/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp +++ b/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp @@ -78,9 +78,10 @@ static void ImposeStackOrdering(MachineInstr *MI, MachineRegisterInfo &MRI) { ImposeStackInputOrdering(MI); // Also read the opaque EXPR_STACK register. - MI->addOperand(MachineOperand::CreateReg(WebAssembly::EXPR_STACK, - /*isDef=*/false, - /*isImp=*/true)); + if (!MI->readsRegister(WebAssembly::EXPR_STACK)) + MI->addOperand(MachineOperand::CreateReg(WebAssembly::EXPR_STACK, + /*isDef=*/false, + /*isImp=*/true)); // Also, mark any inputs to this instruction as being consumed by an // instruction on the expression stack. |
