AMDGPU: Refactor exp instructions
Structure the definitions a bit more like the other classes.
The main change here is to split EXP with the done bit set
to a separate opcode, so we can set mayLoad = 1 so that it won't
be reordered before the other exp stores, since this has the special
constraint that if the done bit is set then this should be the last
exp in she shader.
Previously all exp instructions were inferred to have unmodeled
side effects.
llvm-svn: 288695
diff --git a/llvm/lib/Target/AMDGPU/SIInsertSkips.cpp b/llvm/lib/Target/AMDGPU/SIInsertSkips.cpp
index 9df0838..91e4bf75 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertSkips.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertSkips.cpp
@@ -159,16 +159,15 @@
MachineBasicBlock::iterator Insert = SkipBB->begin();
// Exec mask is zero: Export to NULL target...
- BuildMI(*SkipBB, Insert, DL, TII->get(AMDGPU::EXP))
- .addImm(0)
+ BuildMI(*SkipBB, Insert, DL, TII->get(AMDGPU::EXP_DONE))
.addImm(0x09) // V_008DFC_SQ_EXP_NULL
- .addImm(0)
- .addImm(1)
- .addImm(1)
.addReg(AMDGPU::VGPR0, RegState::Undef)
.addReg(AMDGPU::VGPR0, RegState::Undef)
.addReg(AMDGPU::VGPR0, RegState::Undef)
- .addReg(AMDGPU::VGPR0, RegState::Undef);
+ .addReg(AMDGPU::VGPR0, RegState::Undef)
+ .addImm(1) // vm
+ .addImm(0) // compr
+ .addImm(0); // en
// ... and terminate wavefront.
BuildMI(*SkipBB, Insert, DL, TII->get(AMDGPU::S_ENDPGM));