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[AMDGPU] Add test to show failure with SRC_*_HI registers. NFC. (#154828)

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Since src_{private|shared}_{base|limit} registers are added and
are not artifical compiler happily uses it when it can. In HW
these registers do not exist and the encoding belongs to their
64-bit super-register or 32-bit low register. Same instructions
will produce relocation if run through asm.
This commit is contained in:
Stanislav Mekhanoshin 2025-08-22 00:50:25 -07:00 committed by GitHub
parent cf5243619a
commit e0945dfa30
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llvm/test/CodeGen/AMDGPU/regcoalesce-64-bit-only-regs.mir Normal file
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# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -start-before=register-coalescer -show-mc-encoding -o - %s | FileCheck %s
# FIXME: These SRC_*_HI registers do not exist, although defined in the register file
# and happily used by the coalescer. The resulting encoding is in fact belong
# to the 64-bit register and corresponding *_LO 32-bit part of it.
# CHECK-LABEL: src_private_base:
# CHECK: s_subb_u32 s0, SRC_PRIVATE_BASE_HI, s1 ; encoding: [0xed,0x01,0x80,0x82]
---
name: src_private_base
tracksRegLiveness: true
body: |
bb.0:
%0:sreg_64 = COPY $src_private_base
%1:sreg_64 = IMPLICIT_DEF
$scc = IMPLICIT_DEF
%2:sreg_32 = S_SUBB_U32 killed %0.sub1:sreg_64, %1.sub1:sreg_64, implicit-def dead $scc, implicit killed $scc
...
# CHECK-LABEL: src_private_limit:
# CHECK: s_subb_u32 s0, SRC_PRIVATE_LIMIT_HI, s1 ; encoding: [0xee,0x01,0x80,0x82]
---
name: src_private_limit
tracksRegLiveness: true
body: |
bb.0:
%0:sreg_64 = COPY $src_private_limit
%1:sreg_64 = IMPLICIT_DEF
$scc = IMPLICIT_DEF
%2:sreg_32 = S_SUBB_U32 killed %0.sub1:sreg_64, %1.sub1:sreg_64, implicit-def dead $scc, implicit killed $scc
...
# CHECK-LABEL: src_shared_base:
# CHECK: s_subb_u32 s0, SRC_SHARED_BASE_HI, s1 ; encoding: [0xeb,0x01,0x80,0x82]
---
name: src_shared_base
tracksRegLiveness: true
body: |
bb.0:
%0:sreg_64 = COPY $src_shared_base
%1:sreg_64 = IMPLICIT_DEF
$scc = IMPLICIT_DEF
%2:sreg_32 = S_SUBB_U32 killed %0.sub1:sreg_64, %1.sub1:sreg_64, implicit-def dead $scc, implicit killed $scc
...
# CHECK-LABEL: src_shared_limit:
# CHECK: s_subb_u32 s0, SRC_SHARED_LIMIT_HI, s1 ; encoding: [0xec,0x01,0x80,0x82]
---
name: src_shared_limit
tracksRegLiveness: true
body: |
bb.0:
%0:sreg_64 = COPY $src_shared_limit
%1:sreg_64 = IMPLICIT_DEF
$scc = IMPLICIT_DEF
%2:sreg_32 = S_SUBB_U32 killed %0.sub1:sreg_64, %1.sub1:sreg_64, implicit-def dead $scc, implicit killed $scc
...