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59de807f62
This is the groundwork required to implement strictfp. For now, this should be NFC for regular instructoins (many instructions just gain an extra use of a reserved register). Regalloc won't rematerialize instructions with reads of physical registers, but we were suffering from that anyway with the exec reads. Should add it for all the related FP uses (possibly with some extras). I did not add it to either the gpr index mode instructions (or every single VALU instruction) since it's a ridiculous feature already modeled as an arbitrary side effect. Also work towards marking instructions with FP exceptions. This doesn't actually set the bit yet since this would start to change codegen. It seems nofpexcept is currently not implied from the regular IR FP operations. Add it to some MIR tests where I think it might matter.
71 lines
2.6 KiB
YAML
71 lines
2.6 KiB
YAML
# RUN: llc -mtriple=amdgcn-amd-amdhsa -amdgpu-dce-in-ra=0 -verify-machineinstrs -stress-regalloc=1 -start-before=simple-register-coalescing -stop-after=greedy -o - %s | FileCheck %s
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# https://bugs.llvm.org/show_bug.cgi?id=33620
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---
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# This would assert due to the empty live interval created for %9
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# on the last S_NOP with an undef subreg use.
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# CHECK-LABEL: name: expecting_non_empty_interval
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# CHECK: undef %7.sub1:vreg_64 = V_MAC_F32_e32 0, undef %1:vgpr_32, undef %7.sub1, implicit $mode, implicit $exec
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# CHECK-NEXT: SI_SPILL_V64_SAVE %7, %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr32, 0, implicit $exec :: (store 8 into %stack.0, align 4, addrspace 5)
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# CHECK-NEXT: undef %5.sub1:vreg_64 = V_MOV_B32_e32 1786773504, implicit $exec
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# CHECK-NEXT: dead %3:vgpr_32 = V_MUL_F32_e32 0, %5.sub1, implicit $mode, implicit $exec
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# CHECK: S_NOP 0, implicit %6.sub1
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# CHECK-NEXT: %8:vreg_64 = SI_SPILL_V64_RESTORE %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr32, 0, implicit $exec :: (load 8 from %stack.0, align 4, addrspace 5)
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# CHECK-NEXT: S_NOP 0, implicit %8.sub1
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# CHECK-NEXT: S_NOP 0, implicit undef %9.sub0
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name: expecting_non_empty_interval
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tracksRegLiveness: true
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machineFunctionInfo:
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scratchRSrcReg: $sgpr0_sgpr1_sgpr2_sgpr3
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stackPtrOffsetReg: $sgpr32
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body: |
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bb.0:
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successors: %bb.1
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undef %0.sub1:vreg_64 = V_MAC_F32_e32 0, undef %1:vgpr_32, undef %0.sub1, implicit $mode, implicit $exec
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undef %2.sub1:vreg_64 = V_MOV_B32_e32 1786773504, implicit $exec
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dead %3:vgpr_32 = V_MUL_F32_e32 0, %2.sub1, implicit $mode, implicit $exec
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bb.1:
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S_NOP 0, implicit %2.sub1
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S_NOP 0, implicit %0.sub1
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S_NOP 0, implicit undef %0.sub0
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...
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# Similar assert which happens when trying to rematerialize.
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# https://bugs.llvm.org/show_bug.cgi?id=33884
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---
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# CHECK-LABEL: name: rematerialize_empty_interval_has_reference
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# CHECK-NOT: MOV
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# CHECK: undef %1.sub2:vreg_128 = V_MOV_B32_e32 1786773504, implicit $exec
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# CHECK: bb.1:
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# CHECK-NEXT: S_NOP 0, implicit %1.sub2
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# CHECK-NEXT: S_NOP 0, implicit undef %4.sub0
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# CHECK-NEXT: undef %2.sub2:vreg_128 = V_MOV_B32_e32 0, implicit $exec
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# CHECK-NEXT: S_NOP 0, implicit %2.sub2
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name: rematerialize_empty_interval_has_reference
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tracksRegLiveness: true
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machineFunctionInfo:
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scratchRSrcReg: $sgpr0_sgpr1_sgpr2_sgpr3
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stackPtrOffsetReg: $sgpr32
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body: |
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bb.0:
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successors: %bb.1
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undef %0.sub2:vreg_128 = V_MOV_B32_e32 0, implicit $exec
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undef %1.sub2:vreg_128 = V_MOV_B32_e32 1786773504, implicit $exec
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bb.1:
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S_NOP 0, implicit %1.sub2
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S_NOP 0, implicit undef %0.sub0
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S_NOP 0, implicit %0.sub2
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...
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