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R600: improve inputs/interpolation handling

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Use one intrinsic for all sorts of interpolation.
Use two separate unexpanded instructions to represent INTERP_XY and _ZW -
this will allow to eliminate one part if it's not used.
Track liveness of special interpolation regs instead of reserving them -
this will allow to reuse those regs, lowering reg pressure.

Patch By: Vadim Girlin

v2[Vincent Lejeune]: Rebased against current llvm master

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174394 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard
2013-02-05 17:09:14 +00:00
parent ebc535bc4a
commit 29b15a3780
10 changed files with 129 additions and 251 deletions
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1
lib/Target/R600/R600InstrInfo.cpp
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@@ -104,7 +104,6 @@ bool R600InstrInfo::isPlaceHolderOpcode(unsigned Opcode) const {
switch (Opcode) {
default: return false;
case AMDGPU::RETURN:
case AMDGPU::RESERVE_REG:
return true;
}
}