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4033a61f5d
The current implementation of skip insertion (SIInsertSkip) makes it a mandatory pass required for correctness. Initially, the idea was to have an optional pass. This patch inserts the s_cbranch_execz upfront during SILowerControlFlow to skip over the sections of code when no lanes are active. Later, SIRemoveShortExecBranches removes the skips for short branches, unless there is a sideeffect and the skip branch is really necessary. This new pass will replace the handling of skip insertion in the existing SIInsertSkip Pass. Differential revision: https://reviews.llvm.org/D68092
69 lines
3.9 KiB
LLVM
69 lines
3.9 KiB
LLVM
; RUN: llc -mtriple=amdgcn-- -amdgpu-atomic-optimizations=true -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,GCN64,GFX7LESS %s
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; RUN: llc -mtriple=amdgcn-- -mcpu=tonga -mattr=-flat-for-global -amdgpu-atomic-optimizations=true -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,GCN64,GFX8MORE,GFX8MORE64,DPPCOMB %s
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; RUN: llc -mtriple=amdgcn-- -mcpu=gfx900 -mattr=-flat-for-global -amdgpu-atomic-optimizations=true -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,GCN64,GFX8MORE,GFX8MORE64,DPPCOMB %s
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; RUN: llc -mtriple=amdgcn-- -mcpu=gfx1010 -mattr=-wavefrontsize32,+wavefrontsize64 -mattr=-flat-for-global -amdgpu-atomic-optimizations=true -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,GCN64,GFX8MORE,GFX8MORE64 %s
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; RUN: llc -mtriple=amdgcn-- -mcpu=gfx1010 -mattr=+wavefrontsize32,-wavefrontsize64 -mattr=-flat-for-global -amdgpu-atomic-optimizations=true -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,GCN32,GFX8MORE,GFX8MORE32 %s
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declare i1 @llvm.amdgcn.wqm.vote(i1)
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declare i32 @llvm.amdgcn.raw.buffer.atomic.add(i32, <4 x i32>, i32, i32, i32 immarg)
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declare void @llvm.amdgcn.raw.buffer.store.f32(float, <4 x i32>, i32, i32, i32 immarg)
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; Show that what the atomic optimization pass will do for raw buffers.
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; GCN-LABEL: add_i32_constant:
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; %bb.{{[0-9]+}}:
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; GCN32: v_cmp_ne_u32_e64 s[[exec_lo:[0-9]+]], 1, 0
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; GCN64: v_cmp_ne_u32_e64 s{{\[}}[[exec_lo:[0-9]+]]:[[exec_hi:[0-9]+]]{{\]}}, 1, 0
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; GCN: v_mbcnt_lo_u32_b32{{(_e[0-9]+)?}} v[[mbcnt:[0-9]+]], s[[exec_lo]], 0
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; GCN64: v_mbcnt_hi_u32_b32{{(_e[0-9]+)?}} v[[mbcnt]], s[[exec_hi]], v[[mbcnt]]
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; GCN: v_cmp_eq_u32{{(_e[0-9]+)?}} vcc{{(_lo)?}}, 0, v[[mbcnt]]
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; GCN32: s_bcnt1_i32_b32 s[[popcount:[0-9]+]], s[[exec_lo]]
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; GCN64: s_bcnt1_i32_b64 s[[popcount:[0-9]+]], s{{\[}}[[exec_lo]]:[[exec_hi]]{{\]}}
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; GCN: v_mul_u32_u24{{(_e[0-9]+)?}} v[[value:[0-9]+]], s[[popcount]], 5
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; GCN: buffer_atomic_add v[[value]]
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; GCN: v_readfirstlane_b32 s{{[0-9]+}}, v[[value]]
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define amdgpu_ps void @add_i32_constant(<4 x i32> inreg %out, <4 x i32> inreg %inout) {
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entry:
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%cond1 = call i1 @llvm.amdgcn.wqm.vote(i1 true)
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%old = call i32 @llvm.amdgcn.raw.buffer.atomic.add(i32 5, <4 x i32> %inout, i32 0, i32 0, i32 0)
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%cond2 = call i1 @llvm.amdgcn.wqm.vote(i1 true)
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%cond = and i1 %cond1, %cond2
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br i1 %cond, label %if, label %else
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if:
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%bitcast = bitcast i32 %old to float
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call void @llvm.amdgcn.raw.buffer.store.f32(float %bitcast, <4 x i32> %out, i32 0, i32 0, i32 0)
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ret void
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else:
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ret void
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}
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; GCN-LABEL: add_i32_varying:
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; GFX7LESS-NOT: v_mbcnt_lo_u32_b32
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; GFX7LESS-NOT: v_mbcnt_hi_u32_b32
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; GFX8MORE32: v_cmp_ne_u32_e64 s[[exec_lo:[0-9]+]], 1, 0
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; GFX8MORE64: v_cmp_ne_u32_e64 s{{\[}}[[exec_lo:[0-9]+]]:[[exec_hi:[0-9]+]]{{\]}}, 1, 0
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; GFX8MORE: v_mbcnt_lo_u32_b32{{(_e[0-9]+)?}} v[[mbcnt:[0-9]+]], s[[exec_lo]], 0
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; GFX8MORE64: v_mbcnt_hi_u32_b32{{(_e[0-9]+)?}} v[[mbcnt]], s[[exec_hi]], v[[mbcnt]]
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; DPPCOMB: v_add_u32_dpp
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; DPPCOMB: v_add_u32_dpp
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; GFX8MORE32: v_readlane_b32 s[[scalar_value:[0-9]+]], v{{[0-9]+}}, 31
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; GFX8MORE64: v_readlane_b32 s[[scalar_value:[0-9]+]], v{{[0-9]+}}, 63
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; GFX8MORE: v_cmp_eq_u32{{(_e[0-9]+)?}} vcc{{(_lo)?}}, 0, v[[mbcnt]]
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; GFX8MORE: v_mov_b32{{(_e[0-9]+)?}} v[[value:[0-9]+]], s[[scalar_value]]
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; GFX8MORE: buffer_atomic_add v[[value]]
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; GFX8MORE: v_readfirstlane_b32 s{{[0-9]+}}, v[[value]]
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define amdgpu_ps void @add_i32_varying(<4 x i32> inreg %out, <4 x i32> inreg %inout, i32 %val) {
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entry:
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%cond1 = call i1 @llvm.amdgcn.wqm.vote(i1 true)
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%old = call i32 @llvm.amdgcn.raw.buffer.atomic.add(i32 %val, <4 x i32> %inout, i32 0, i32 0, i32 0)
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%cond2 = call i1 @llvm.amdgcn.wqm.vote(i1 true)
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%cond = and i1 %cond1, %cond2
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br i1 %cond, label %if, label %else
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if:
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%bitcast = bitcast i32 %old to float
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call void @llvm.amdgcn.raw.buffer.store.f32(float %bitcast, <4 x i32> %out, i32 0, i32 0, i32 0)
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ret void
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else:
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ret void
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}
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