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[AMDGPU] Make VGPR_16_Lo128 allocatable (#173309)

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Allows allocation of V_FMAMK_F16/V_FMAAK_F16 registers in
real true16 mode.
This commit is contained in:
Stanislav Mekhanoshin 2026-01-14 10:40:05 -08:00 committed by GitHub
parent 1f5c445c4b
commit 65ab8fe54b
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GPG Key ID: B5690EEEBB952194
2 changed files with 13 additions and 8 deletions
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2
llvm/lib/Target/AMDGPU/SIRegisterInfo.td
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@ -614,9 +614,9 @@ def VGPR_16 : SIRegisterClass<"AMDGPU", Reg16Types.types, 16,
def VGPR_16_Lo128 : SIRegisterClass<"AMDGPU", Reg16Types.types, 16,
(add (interleave (sequence "VGPR%u_LO16", 0, 127),
(sequence "VGPR%u_HI16", 0, 127)))> {
let AllocationPriority = !add(2, !mul(BaseClassPriority, BaseClassScaleFactor));
let Size = 16;
let GeneratePressureSet = 0;
let isAllocatable = 0;
// This is the base class for VGPR{0..127}_{LO16,HI16}.
let BaseClassOrder = 16;

19
llvm/test/CodeGen/AMDGPU/fmamk_fmaak-t16.mir
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@ -1,10 +1,5 @@
# RUN: not llc -mtriple=amdgcn -mcpu=gfx1100 -mattr=+real-true16 -run-pass=none -filetype=null %s 2>&1 | FileCheck -check-prefix=GFX11 %s
# RUN: not llc -mtriple=amdgcn -mcpu=gfx1100 -mattr=+real-true16 -start-before=greedy,0 -stop-after=virtregrewriter,2 -o - %s 2>&1 | FileCheck -check-prefix=GFX11 %s
# FIXME: There is no allocatable 16-bit VGPR class and these instructions
# do not have VOP3 forms for allocatable VGPR_16 to be used.
# GFX11: Cannot use non-allocatable class 'VGPR_16_Lo128' for virtual register
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
# RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -mattr=+real-true16 -start-before=greedy,0 -stop-after=virtregrewriter,2 -o - %s | FileCheck -check-prefix=GFX11 %s
---
name: v_fmamk_f16
@ -12,6 +7,11 @@ tracksRegLiveness: true
body: |
bb.0:
liveins: $vgpr0, $vgpr1
; GFX11-LABEL: name: v_fmamk_f16
; GFX11: liveins: $vgpr0, $vgpr1
; GFX11-NEXT: {{ $}}
; GFX11-NEXT: renamable $vgpr0_lo16 = nofpexcept V_FMAMK_F16_t16 killed $vgpr0_lo16, 1, killed $vgpr1_hi16, implicit $exec, implicit $mode
; GFX11-NEXT: S_ENDPGM 0, implicit killed renamable $vgpr0_lo16
%0:vgpr_32_lo128 = COPY $vgpr0
%1:vgpr_32_lo128 = COPY $vgpr1
%2:vgpr_16_lo128 = nofpexcept V_FMAMK_F16_t16 %0.lo16, 1, %1.hi16, implicit $exec, implicit $mode
@ -24,6 +24,11 @@ tracksRegLiveness: true
body: |
bb.0:
liveins: $vgpr0, $vgpr1
; GFX11-LABEL: name: v_fmaak_f16
; GFX11: liveins: $vgpr0, $vgpr1
; GFX11-NEXT: {{ $}}
; GFX11-NEXT: renamable $vgpr0_lo16 = nofpexcept V_FMAAK_F16_t16 killed $vgpr0_lo16, killed $vgpr1_hi16, 1, implicit $exec, implicit $mode
; GFX11-NEXT: S_ENDPGM 0, implicit killed renamable $vgpr0_lo16
%0:vgpr_32_lo128 = COPY $vgpr0
%1:vgpr_32_lo128 = COPY $vgpr1
%2:vgpr_16_lo128 = nofpexcept V_FMAAK_F16_t16 %0.lo16, %1.hi16, 1, implicit $exec, implicit $mode