Commit Graph

17 Commits

Author SHA1 Message Date
Dan Gohman b7c2400fa7 [WebAssembly] Optimize away return instructions using fallthroughs.
This saves a small amount of code size, and is a first small step toward
passing values on the stack across block boundaries.

Differential Review: http://reviews.llvm.org/D20450

llvm-svn: 270294
2016-05-21 00:21:56 +00:00
Dan Gohman 847afa2231 [WebAssembly] Simplify code that never has to handle physical registers. NFC.
llvm-svn: 270137
2016-05-19 21:07:20 +00:00
Dan Gohman 7100809080 [WebAssembly] Rename $discard to $drop in the assembly output.
llvm-svn: 269862
2016-05-17 23:19:03 +00:00
Dan Gohman 27a11eefcc [WebAssembly] Support physical registers in the rewrite-to-discard optimization.
llvm-svn: 261465
2016-02-21 03:27:22 +00:00
Derek Schuff 90d9e8d370 [WebAssembly] Omit no-op adds for non-mem uses of FrameIndex
Differential Revision: http://reviews.llvm.org/D16554

llvm-svn: 258872
2016-01-26 22:47:43 +00:00
Derek Schuff e7305cc4b3 [WebAssembly] Remove check for FrameIndex operands in WebAssemblyPeephole
This pass runs after FrameIndex elimination, so it should never see FI
operands. NFC

llvm-svn: 258860
2016-01-26 21:08:27 +00:00
JF Bastien 43436716aa WebAssembly NFC: update error message
I forgot to update this one in my previous patch.

llvm-svn: 258853
2016-01-26 20:24:51 +00:00
JF Bastien 1a6c7608b1 WebAssembly: don't optimize memcpy/memmove/memcpy to frame index
r258781 optimized memcpy/memmove/memcpy so the intrinsic call can return its first argument, but missed the frame index case. Teach it to ignore that case so C code doesn't assert out in these cases.

llvm-svn: 258851
2016-01-26 20:22:42 +00:00
Dan Gohman bdf08d5da6 [WebAssembly] Optimize memcpy/memmove/memcpy calls.
These calls return their first argument, but because LLVM uses an intrinsic
with a void return type, they can't use the returned attribute. Generalize
the store results pass to optimize these calls too.

llvm-svn: 258781
2016-01-26 04:01:11 +00:00
Dan Gohman bb3722430f [WebAssembly] Implement unaligned loads and stores.
Differential Revision: http://reviews.llvm.org/D16534

llvm-svn: 258779
2016-01-26 03:39:31 +00:00
Dan Gohman 8394756937 [WebAssembly] Minor code cleanups. NFC.
llvm-svn: 258294
2016-01-20 05:54:22 +00:00
Derek Schuff 9769debf88 [WebAssembly] Implement prolog/epilog insertion and FrameIndex elimination
Summary:
Use the SP32 physical register as the base for FrameIndex
lowering. Update it and the __stack_pointer global var in the prolog and
epilog. Extend the mapping of virtual registers to wasm locals to
include the physical registers.

Rather than modify the target-independent PrologEpilogInserter (which
asserts that there are no virtual registers left) include a
slightly-modified copy for Wasm that does not have this assertion and
only clears the virtual registers if scavenging was needed (which of
course it isn't for wasm).

Differential Revision: http://reviews.llvm.org/D15344

llvm-svn: 255392
2015-12-11 23:49:46 +00:00
Dan Gohman a87629d6d7 [WebAssembly] Fix WebAssemblyPeephole to set Changed to true when making changes.
llvm-svn: 255252
2015-12-10 14:16:34 +00:00
Dan Gohman acc0941bd1 [WebAssembly] Declare that WebAssemblyPeephole does not modify the CFG.
llvm-svn: 255251
2015-12-10 14:12:04 +00:00
Dan Gohman f0b165a7f8 [WebAssembly] Implement ReverseBranchCondition, and re-enable MachineBlockPlacement
This patch introduces a codegen-only instruction currently named br_unless,
which makes it convenient to implement ReverseBranchCondition and re-enable
the MachineBlockPlacement pass. Then in a late pass, it lowers br_unless
back into br_if.

Differential Revision: http://reviews.llvm.org/D14995

llvm-svn: 254826
2015-12-05 03:03:35 +00:00
Dan Gohman 80e34e0a18 [WebAssembly] Fix WebAssembly register numbering for registers added late.
If virtual registers are created late, mappings to WebAssembly
registers need to be added explicitly. This patch adds a function
to do so and teaches WebAssemblyPeephole to use it. This fixes
an out-of-bounds access on the WARegs vector.

llvm-svn: 254094
2015-11-25 21:13:02 +00:00
Dan Gohman 81719f8555 [WebAssembly] Support for register stackifying with load and store instructions.
llvm-svn: 254076
2015-11-25 16:55:01 +00:00