6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-05 13:26:55 +00:00
Code Issues Projects Releases Wiki Activity

Distribute (A + B) * C to (A * C) + (B * C) to make use of NEON multiplier

Browse Source 
accumulator forwarding:
vadd d3, d0, d1
vmul d3, d3, d2
=>
vmul d3, d0, d2
vmla d3, d1, d2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128665 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2011-03-31 19:38:48 +00:00
parent a52d7da1d8
commit 463d358f1d
4 changed files with 80 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
lib/Target/ARM/ARMSubtarget.h
View File

@@ -61,6 +61,10 @@ protected:
/// whether the FP VML[AS] instructions are slow (if so, don't use them).
bool SlowFPVMLx;
/// HasVMLxForwarding - If true, NEON has special multiplier accumulator
/// forwarding to allow mul + mla being issued back to back.
bool HasVMLxForwarding;
/// SlowFPBrcc - True if floating point compare + branch is slow.
bool SlowFPBrcc;
@@ -182,6 +186,7 @@ protected:
bool hasT2ExtractPack() const { return HasT2ExtractPack; }
bool hasDataBarrier() const { return HasDataBarrier; }
bool useFPVMLx() const { return !SlowFPVMLx; }
bool hasVMLxForwarding() const { return HasVMLxForwarding; }
bool isFPBrccSlow() const { return SlowFPBrcc; }
bool isFPOnlySP() const { return FPOnlySP; }
bool prefers32BitThumb() const { return Pref32BitThumb; }