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Differential D113746

[AMDGPU][MC][GFX10] Corrected global_atomic_fcmpswap*
ClosedPublic

Authored by dp on Nov 12 2021, 1:59 AM.

Details

Reviewers
rampitec
foad
Commits
rG91f4650ebb05: [AMDGPU][MC][GFX10] Corrected global_atomic_fcmpswap*
Summary

Corrected src data size of global_atomic_fcmpswap and global_atomic_fcmpswap_x2 opcodes.

See bug 51725.

Diff Detail

Event Timeline

dp created this revision.Nov 12 2021, 1:59 AM
Herald added subscribers: foad, kerbowa, hiraditya and 8 others. · View Herald TranscriptNov 12 2021, 1:59 AM
dp requested review of this revision.Nov 12 2021, 1:59 AM
Herald added a project: Restricted Project. · View Herald TranscriptNov 12 2021, 1:59 AM
Herald added subscribers: llvm-commits, wdng. · View Herald Transcript
Harbormaster completed remote builds in B133897: Diff 386765.Nov 12 2021, 2:59 AM
dp added reviewers: rampitec, foad.Nov 12 2021, 3:04 AM
foad accepted this revision.Nov 12 2021, 3:09 AM

LGTM.

This revision is now accepted and ready to land.Nov 12 2021, 3:09 AM
rampitec accepted this revision.Nov 12 2021, 9:51 AM

LGTM

Closed by commit rG91f4650ebb05: [AMDGPU][MC][GFX10] Corrected global_atomic_fcmpswap* (authored by dp). · Explain WhyNov 15 2021, 1:48 AM
This revision was automatically updated to reflect the committed changes.
dp added a commit: rG91f4650ebb05: [AMDGPU][MC][GFX10] Corrected global_atomic_fcmpswap*.

Revision Contents

PathSize
llvm/
lib/
Target/
AMDGPU/
4 lines
test/
CodeGen/
AMDGPU/
12 lines
MC/
AMDGPU/
40 lines
Disassembler/
AMDGPU/
40 lines

Diff 387178

llvm/lib/Target/AMDGPU/FLATInstructions.td

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defm SCRATCH_STORE_BYTE_D16_HI : FLAT_Scratch_Store_Pseudo <"scratch_store_byte_d16_hi", VGPR_32>; defm SCRATCH_STORE_BYTE_D16_HI : FLAT_Scratch_Store_Pseudo <"scratch_store_byte_d16_hi", VGPR_32>;
defm SCRATCH_STORE_SHORT_D16_HI : FLAT_Scratch_Store_Pseudo <"scratch_store_short_d16_hi", VGPR_32>; defm SCRATCH_STORE_SHORT_D16_HI : FLAT_Scratch_Store_Pseudo <"scratch_store_short_d16_hi", VGPR_32>;
} // End SubtargetPredicate = HasFlatScratchInsts } // End SubtargetPredicate = HasFlatScratchInsts
let SubtargetPredicate = isGFX10Plus, is_flat_global = 1 in { let SubtargetPredicate = isGFX10Plus, is_flat_global = 1 in {
defm GLOBAL_ATOMIC_FCMPSWAP : defm GLOBAL_ATOMIC_FCMPSWAP :
FLAT_Global_Atomic_Pseudo<"global_atomic_fcmpswap", VGPR_32, f32>; FLAT_Global_Atomic_Pseudo<"global_atomic_fcmpswap", VGPR_32, f32, null_frag, v2f32, VReg_64>;
defm GLOBAL_ATOMIC_FMIN : defm GLOBAL_ATOMIC_FMIN :
FLAT_Global_Atomic_Pseudo<"global_atomic_fmin", VGPR_32, f32, int_amdgcn_global_atomic_fmin>; FLAT_Global_Atomic_Pseudo<"global_atomic_fmin", VGPR_32, f32, int_amdgcn_global_atomic_fmin>;
defm GLOBAL_ATOMIC_FMAX : defm GLOBAL_ATOMIC_FMAX :
FLAT_Global_Atomic_Pseudo<"global_atomic_fmax", VGPR_32, f32, int_amdgcn_global_atomic_fmax>; FLAT_Global_Atomic_Pseudo<"global_atomic_fmax", VGPR_32, f32, int_amdgcn_global_atomic_fmax>;
defm GLOBAL_ATOMIC_FCMPSWAP_X2 : defm GLOBAL_ATOMIC_FCMPSWAP_X2 :
FLAT_Global_Atomic_Pseudo<"global_atomic_fcmpswap_x2", VReg_64, f64>; FLAT_Global_Atomic_Pseudo<"global_atomic_fcmpswap_x2", VReg_64, f64, null_frag, v2f64, VReg_128>;
defm GLOBAL_ATOMIC_FMIN_X2 : defm GLOBAL_ATOMIC_FMIN_X2 :
FLAT_Global_Atomic_Pseudo<"global_atomic_fmin_x2", VReg_64, f64, int_amdgcn_global_atomic_fmin>; FLAT_Global_Atomic_Pseudo<"global_atomic_fmin_x2", VReg_64, f64, int_amdgcn_global_atomic_fmin>;
defm GLOBAL_ATOMIC_FMAX_X2 : defm GLOBAL_ATOMIC_FMAX_X2 :
FLAT_Global_Atomic_Pseudo<"global_atomic_fmax_x2", VReg_64, f64, int_amdgcn_global_atomic_fmax>; FLAT_Global_Atomic_Pseudo<"global_atomic_fmax_x2", VReg_64, f64, int_amdgcn_global_atomic_fmax>;
} // End SubtargetPredicate = isGFX10Plus, is_flat_global = 1 } // End SubtargetPredicate = isGFX10Plus, is_flat_global = 1
let is_flat_global = 1 in { let is_flat_global = 1 in {
let OtherPredicates = [HasAtomicFaddInsts] in { let OtherPredicates = [HasAtomicFaddInsts] in {
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llvm/test/CodeGen/AMDGPU/fp-atomic-to-s_denormmode.mir

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# GCN-LABEL: name: global_atomic_fcmpswap_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fcmpswap_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FCMPSWAP # GCN: GLOBAL_ATOMIC_FCMPSWAP
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
name: global_atomic_fcmpswap_to_s_denorm_mode name: global_atomic_fcmpswap_to_s_denorm_mode
body: | body: |
bb.0: bb.0:
GLOBAL_ATOMIC_FCMPSWAP undef %0:vreg_64, undef %1:vgpr_32, 0, 0, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`) GLOBAL_ATOMIC_FCMPSWAP undef %0:vreg_64, undef %1:vreg_64, 0, 0, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`)
S_DENORM_MODE 0, implicit-def $mode, implicit $mode S_DENORM_MODE 0, implicit-def $mode, implicit $mode
... ...
# GCN-LABEL: name: global_atomic_fcmpswap_x2_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fcmpswap_x2_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FCMPSWAP_X2 # GCN: GLOBAL_ATOMIC_FCMPSWAP_X2
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
name: global_atomic_fcmpswap_x2_to_s_denorm_mode name: global_atomic_fcmpswap_x2_to_s_denorm_mode
body: | body: |
bb.0: bb.0:
GLOBAL_ATOMIC_FCMPSWAP_X2 undef %0:vreg_64, undef %1:vreg_64, 0, 0, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`) GLOBAL_ATOMIC_FCMPSWAP_X2 undef %0:vreg_64, undef %1:vreg_128, 0, 0, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`)
S_DENORM_MODE 0, implicit-def $mode, implicit $mode S_DENORM_MODE 0, implicit-def $mode, implicit $mode
... ...
# GCN-LABEL: name: global_atomic_fmax_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fmax_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FMAX # GCN: GLOBAL_ATOMIC_FMAX
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
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# GCN-LABEL: name: global_atomic_fcmpswap_rtn_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fcmpswap_rtn_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FCMPSWAP_RTN # GCN: GLOBAL_ATOMIC_FCMPSWAP_RTN
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
name: global_atomic_fcmpswap_rtn_to_s_denorm_mode name: global_atomic_fcmpswap_rtn_to_s_denorm_mode
body: | body: |
bb.0: bb.0:
%2:vgpr_32 = GLOBAL_ATOMIC_FCMPSWAP_RTN undef %0:vreg_64, undef %1:vgpr_32, 0, 1, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`) %2:vgpr_32 = GLOBAL_ATOMIC_FCMPSWAP_RTN undef %0:vreg_64, undef %1:vreg_64, 0, 1, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`)
S_DENORM_MODE 0, implicit-def $mode, implicit $mode S_DENORM_MODE 0, implicit-def $mode, implicit $mode
... ...
# GCN-LABEL: name: global_atomic_fcmpswap_x2_rtn_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fcmpswap_x2_rtn_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FCMPSWAP_X2_RTN # GCN: GLOBAL_ATOMIC_FCMPSWAP_X2_RTN
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
name: global_atomic_fcmpswap_x2_rtn_to_s_denorm_mode name: global_atomic_fcmpswap_x2_rtn_to_s_denorm_mode
body: | body: |
bb.0: bb.0:
%2:vreg_64 = GLOBAL_ATOMIC_FCMPSWAP_X2_RTN undef %0:vreg_64, undef %1:vreg_64, 0, 1, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`) %2:vreg_64 = GLOBAL_ATOMIC_FCMPSWAP_X2_RTN undef %0:vreg_64, undef %1:vreg_128, 0, 1, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`)
S_DENORM_MODE 0, implicit-def $mode, implicit $mode S_DENORM_MODE 0, implicit-def $mode, implicit $mode
... ...
# GCN-LABEL: name: global_atomic_fmax_rtn_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fmax_rtn_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FMAX_RTN # GCN: GLOBAL_ATOMIC_FMAX_RTN
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
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# GCN-LABEL: name: global_atomic_fcmpswap_saddr_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fcmpswap_saddr_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FCMPSWAP_SADDR # GCN: GLOBAL_ATOMIC_FCMPSWAP_SADDR
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
name: global_atomic_fcmpswap_saddr_to_s_denorm_mode name: global_atomic_fcmpswap_saddr_to_s_denorm_mode
body: | body: |
bb.0: bb.0:
GLOBAL_ATOMIC_FCMPSWAP_SADDR undef %0:vgpr_32, undef %1:vgpr_32, undef %3:sgpr_64, 0, 0, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`) GLOBAL_ATOMIC_FCMPSWAP_SADDR undef %0:vgpr_32, undef %1:vreg_64, undef %3:sgpr_64, 0, 0, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`)
S_DENORM_MODE 0, implicit-def $mode, implicit $mode S_DENORM_MODE 0, implicit-def $mode, implicit $mode
... ...
# GCN-LABEL: name: global_atomic_fcmpswap_x2_saddr_rtn_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fcmpswap_x2_saddr_rtn_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FCMPSWAP_X2_SADDR_RTN # GCN: GLOBAL_ATOMIC_FCMPSWAP_X2_SADDR_RTN
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
name: global_atomic_fcmpswap_x2_saddr_rtn_to_s_denorm_mode name: global_atomic_fcmpswap_x2_saddr_rtn_to_s_denorm_mode
body: | body: |
bb.0: bb.0:
%2:vreg_64 = GLOBAL_ATOMIC_FCMPSWAP_X2_SADDR_RTN undef %0:vgpr_32, undef %1:vreg_64, undef %3:sgpr_64, 0, 1, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`) %2:vreg_64 = GLOBAL_ATOMIC_FCMPSWAP_X2_SADDR_RTN undef %0:vgpr_32, undef %1:vreg_128, undef %3:sgpr_64, 0, 1, implicit $exec :: (volatile load store seq_cst seq_cst (s32) on `float addrspace(1)* undef`)
S_DENORM_MODE 0, implicit-def $mode, implicit $mode S_DENORM_MODE 0, implicit-def $mode, implicit $mode
... ...
# GCN-LABEL: name: global_atomic_fmax_saddr_rtn_to_s_denorm_mode # GCN-LABEL: name: global_atomic_fmax_saddr_rtn_to_s_denorm_mode
# GCN: GLOBAL_ATOMIC_FMAX_SADDR_RTN # GCN: GLOBAL_ATOMIC_FMAX_SADDR_RTN
# GCN-NEXT: S_NOP 2 # GCN-NEXT: S_NOP 2
# GCN-NEXT: S_DENORM_MODE # GCN-NEXT: S_DENORM_MODE
--- ---
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llvm/test/MC/AMDGPU/gfx10_asm_flat.s

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flat_atomic_xor v[1:2], v2 dlc flat_atomic_xor v[1:2], v2 dlc
// GFX10: [0x00,0x10,0xec,0xdc,0x01,0x02,0x7d,0x00] // GFX10: [0x00,0x10,0xec,0xdc,0x01,0x02,0x7d,0x00]
flat_atomic_xor_x2 v[1:2], v[2:3] dlc flat_atomic_xor_x2 v[1:2], v[2:3] dlc
// GFX10: [0x00,0x10,0x6c,0xdd,0x01,0x02,0x7d,0x00] // GFX10: [0x00,0x10,0x6c,0xdd,0x01,0x02,0x7d,0x00]
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
// ENC_FLAT_GLOBAL: fcmpswap.
//===----------------------------------------------------------------------===//
global_atomic_fcmpswap v[1:2], v[2:3], off offset:-1
// GFX10: [0xff,0x8f,0xf8,0xdc,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap v5, v[1:2], v[2:3], off offset:-1 glc
// GFX10: [0xff,0x8f,0xf9,0xdc,0x01,0x02,0x7d,0x05]
global_atomic_fcmpswap v[1:2], v[2:3], off offset:2047
// GFX10: [0xff,0x87,0xf8,0xdc,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap v[1:2], v[2:3], off offset:-2048
// GFX10: [0x00,0x88,0xf8,0xdc,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap v[1:2], v[2:3], off offset:-1 slc
// GFX10: [0xff,0x8f,0xfa,0xdc,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap v[1:2], v[2:3], off offset:-1 dlc
// GFX10: [0xff,0x9f,0xf8,0xdc,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:-1
// GFX10: [0xff,0x8f,0x78,0xdd,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap_x2 v[5:6], v[1:2], v[2:5], off offset:-1 glc
// GFX10: [0xff,0x8f,0x79,0xdd,0x01,0x02,0x7d,0x05]
global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:2047
// GFX10: [0xff,0x87,0x78,0xdd,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:-2048
// GFX10: [0x00,0x88,0x78,0xdd,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:-1 slc
// GFX10: [0xff,0x8f,0x7a,0xdd,0x01,0x02,0x7d,0x00]
global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:-1 dlc
// GFX10: [0xff,0x9f,0x78,0xdd,0x01,0x02,0x7d,0x00]
//===----------------------------------------------------------------------===//
// ENC_FLAT_GLOBAL: dlc support for atomics. // ENC_FLAT_GLOBAL: dlc support for atomics.
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
global_atomic_add v[1:2], v2, off dlc global_atomic_add v[1:2], v2, off dlc
// GFX10: [0x00,0x90,0xc8,0xdc,0x01,0x02,0x7d,0x00] // GFX10: [0x00,0x90,0xc8,0xdc,0x01,0x02,0x7d,0x00]
global_atomic_add_x2 v[1:2], v[2:3], off dlc global_atomic_add_x2 v[1:2], v[2:3], off dlc
// GFX10: [0x00,0x90,0x48,0xdd,0x01,0x02,0x7d,0x00] // GFX10: [0x00,0x90,0x48,0xdd,0x01,0x02,0x7d,0x00]
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llvm/test/MC/Disassembler/AMDGPU/flat_gfx10.txt

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# CHECK: global_atomic_umin_x2 v[1:2], v[2:3], off dlc ; encoding: [0x00,0x90,0x58,0xdd,0x01,0x02,0x7d,0x00] # CHECK: global_atomic_umin_x2 v[1:2], v[2:3], off dlc ; encoding: [0x00,0x90,0x58,0xdd,0x01,0x02,0x7d,0x00]
0x00,0x90,0x58,0xdd,0x01,0x02,0x7d,0x00 0x00,0x90,0x58,0xdd,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_xor v[1:2], v2, off dlc ; encoding: [0x00,0x90,0xec,0xdc,0x01,0x02,0x7d,0x00] # CHECK: global_atomic_xor v[1:2], v2, off dlc ; encoding: [0x00,0x90,0xec,0xdc,0x01,0x02,0x7d,0x00]
0x00,0x90,0xec,0xdc,0x01,0x02,0x7d,0x00 0x00,0x90,0xec,0xdc,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_xor_x2 v[1:2], v[2:3], off dlc ; encoding: [0x00,0x90,0x6c,0xdd,0x01,0x02,0x7d,0x00] # CHECK: global_atomic_xor_x2 v[1:2], v[2:3], off dlc ; encoding: [0x00,0x90,0x6c,0xdd,0x01,0x02,0x7d,0x00]
0x00,0x90,0x6c,0xdd,0x01,0x02,0x7d,0x00 0x00,0x90,0x6c,0xdd,0x01,0x02,0x7d,0x00
#===------------------------------------------------------------------------===#
# FLAT GLOBAL opcodes: fcmpswap
#===------------------------------------------------------------------------===#
# CHECK: global_atomic_fcmpswap v[1:2], v[2:3], off offset:-1 ; encoding: [0xff,0x8f,0xf8,0xdc,0x01,0x02,0x7d,0x00]
0xff,0x8f,0xf8,0xdc,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap v5, v[1:2], v[2:3], off offset:-1 glc ; encoding: [0xff,0x8f,0xf9,0xdc,0x01,0x02,0x7d,0x05]
0xff,0x8f,0xf9,0xdc,0x01,0x02,0x7d,0x05
# CHECK: global_atomic_fcmpswap v[1:2], v[2:3], off offset:2047 ; encoding: [0xff,0x87,0xf8,0xdc,0x01,0x02,0x7d,0x00]
0xff,0x87,0xf8,0xdc,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap v[1:2], v[2:3], off offset:-2048 ; encoding: [0x00,0x88,0xf8,0xdc,0x01,0x02,0x7d,0x00]
0x00,0x88,0xf8,0xdc,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap v[1:2], v[2:3], off offset:-1 slc ; encoding: [0xff,0x8f,0xfa,0xdc,0x01,0x02,0x7d,0x00]
0xff,0x8f,0xfa,0xdc,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap v[1:2], v[2:3], off offset:-1 dlc ; encoding: [0xff,0x9f,0xf8,0xdc,0x01,0x02,0x7d,0x00]
0xff,0x9f,0xf8,0xdc,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:-1 ; encoding: [0xff,0x8f,0x78,0xdd,0x01,0x02,0x7d,0x00]
0xff,0x8f,0x78,0xdd,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap_x2 v[5:6], v[1:2], v[2:5], off offset:-1 glc ; encoding: [0xff,0x8f,0x79,0xdd,0x01,0x02,0x7d,0x05]
0xff,0x8f,0x79,0xdd,0x01,0x02,0x7d,0x05
# CHECK: global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:2047 ; encoding: [0xff,0x87,0x78,0xdd,0x01,0x02,0x7d,0x00]
0xff,0x87,0x78,0xdd,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:-2048 ; encoding: [0x00,0x88,0x78,0xdd,0x01,0x02,0x7d,0x00]
0x00,0x88,0x78,0xdd,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:-1 slc ; encoding: [0xff,0x8f,0x7a,0xdd,0x01,0x02,0x7d,0x00]
0xff,0x8f,0x7a,0xdd,0x01,0x02,0x7d,0x00
# CHECK: global_atomic_fcmpswap_x2 v[1:2], v[2:5], off offset:-1 dlc ; encoding: [0xff,0x9f,0x78,0xdd,0x01,0x02,0x7d,0x00]
0xff,0x9f,0x78,0xdd,0x01,0x02,0x7d,0x00