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llvm-project/llvm/test/CodeGen/AMDGPU/nested-loop-conditions.ll
Brendon Cahoon f1b05a0a2b [StructurizeCFG] Improve basic block ordering 
StructurizeCFG linearizes the successors of branching basic block
by adding Flow blocks to record the true/false path for branches
and back edges. This patch reduces the number of Phi values needed
to capture the control flow path by improving the basic block
ordering.

Previously, StructurizeCFG adds loop exit blocks outside of the
loop. StructurizeCFG sets a boolean value to indicate the path
taken, and all exit block live values extend to after the loop.
For loops with a large number of exits blocks, this creates a
huge number of values that are maintained, which increases
compilation time and register pressure. This is problem
especially with ASAN, which adds early exits to blocks with
unreachable instructions for each instrumented check in the loop.

In specific cases, this patch reduces the number of values needed
after the loop by moving the exit block into the loop. This is
done for blocks that have a single predecessor and single successor
by moving the block to appear just after the predecessor.

Differential Revision: https://reviews.llvm.org/D123231
2022-06-22 16:10:41 -05:00

345 lines
16 KiB
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -mtriple=amdgcn-- -S -structurizecfg -si-annotate-control-flow %s | FileCheck -check-prefix=IR %s
; RUN: llc -march=amdgcn -mcpu=hawaii -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
; After structurizing, there are 3 levels of loops. The i1 phi
; conditions mutually depend on each other, so it isn't safe to delete
; the condition that appears to have no uses until the loop is
; completely processed.
define amdgpu_kernel void @reduced_nested_loop_conditions(i64 addrspace(3)* nocapture %arg) #0 {
; GCN-LABEL: reduced_nested_loop_conditions:
; GCN: ; %bb.0: ; %bb
; GCN-NEXT: s_load_dword s0, s[0:1], 0x9
; GCN-NEXT: v_lshlrev_b32_e32 v0, 3, v0
; GCN-NEXT: s_mov_b32 m0, -1
; GCN-NEXT: s_and_b64 s[2:3], exec, -1
; GCN-NEXT: s_waitcnt lgkmcnt(0)
; GCN-NEXT: v_add_i32_e32 v0, vcc, s0, v0
; GCN-NEXT: ds_read_b64 v[0:1], v0
; GCN-NEXT: s_and_b64 s[0:1], exec, 0
; GCN-NEXT: s_branch .LBB0_2
; GCN-NEXT: .LBB0_1: ; %Flow
; GCN-NEXT: ; in Loop: Header=BB0_2 Depth=1
; GCN-NEXT: s_mov_b64 vcc, s[0:1]
; GCN-NEXT: s_cbranch_vccz .LBB0_4
; GCN-NEXT: .LBB0_2: ; %bb5
; GCN-NEXT: ; =>This Inner Loop Header: Depth=1
; GCN-NEXT: s_mov_b64 s[4:5], -1
; GCN-NEXT: s_mov_b64 vcc, s[2:3]
; GCN-NEXT: s_cbranch_vccz .LBB0_1
; GCN-NEXT: ; %bb.3: ; %bb10
; GCN-NEXT: ; in Loop: Header=BB0_2 Depth=1
; GCN-NEXT: s_mov_b64 s[4:5], 0
; GCN-NEXT: s_branch .LBB0_1
; GCN-NEXT: .LBB0_4: ; %loop.exit.guard
; GCN-NEXT: s_and_b64 vcc, exec, s[4:5]
; GCN-NEXT: s_cbranch_vccz .LBB0_7
; GCN-NEXT: ; %bb.5: ; %bb8
; GCN-NEXT: s_waitcnt lgkmcnt(0)
; GCN-NEXT: ds_read_b32 v0, v0
; GCN-NEXT: s_and_b64 vcc, exec, 0
; GCN-NEXT: .LBB0_6: ; %bb9
; GCN-NEXT: ; =>This Inner Loop Header: Depth=1
; GCN-NEXT: s_mov_b64 vcc, vcc
; GCN-NEXT: s_cbranch_vccz .LBB0_6
; GCN-NEXT: .LBB0_7: ; %DummyReturnBlock
; GCN-NEXT: s_endpgm
; IR-LABEL: @reduced_nested_loop_conditions(
; IR-NEXT: bb:
; IR-NEXT: [[MY_TMP:%.*]] = tail call i32 @llvm.amdgcn.workitem.id.x() #[[ATTR4:[0-9]+]]
; IR-NEXT: [[MY_TMP1:%.*]] = getelementptr inbounds i64, i64 addrspace(3)* [[ARG:%.*]], i32 [[MY_TMP]]
; IR-NEXT: [[MY_TMP2:%.*]] = load volatile i64, i64 addrspace(3)* [[MY_TMP1]], align 4
; IR-NEXT: br label [[BB5:%.*]]
; IR: bb3:
; IR-NEXT: br i1 true, label [[BB4:%.*]], label [[BB13:%.*]]
; IR: bb4:
; IR-NEXT: br label [[FLOW:%.*]]
; IR: bb5:
; IR-NEXT: [[PHI_BROKEN:%.*]] = phi i64 [ [[TMP6:%.*]], [[BB10:%.*]] ], [ 0, [[BB:%.*]] ]
; IR-NEXT: [[MY_TMP6:%.*]] = phi i32 [ 0, [[BB]] ], [ [[TMP5:%.*]], [[BB10]] ]
; IR-NEXT: [[MY_TMP7:%.*]] = icmp eq i32 [[MY_TMP6]], 1
; IR-NEXT: [[TMP0:%.*]] = call { i1, i64 } @llvm.amdgcn.if.i64(i1 [[MY_TMP7]])
; IR-NEXT: [[TMP1:%.*]] = extractvalue { i1, i64 } [[TMP0]], 0
; IR-NEXT: [[TMP2:%.*]] = extractvalue { i1, i64 } [[TMP0]], 1
; IR-NEXT: br i1 [[TMP1]], label [[BB8:%.*]], label [[FLOW]]
; IR: bb8:
; IR-NEXT: br label [[BB13]]
; IR: bb9:
; IR-NEXT: br i1 false, label [[BB3:%.*]], label [[BB9:%.*]]
; IR: bb10:
; IR-NEXT: [[TMP3:%.*]] = call i1 @llvm.amdgcn.loop.i64(i64 [[TMP6]])
; IR-NEXT: br i1 [[TMP3]], label [[BB23:%.*]], label [[BB5]]
; IR: Flow:
; IR-NEXT: [[TMP4:%.*]] = phi i1 [ [[MY_TMP22:%.*]], [[BB4]] ], [ true, [[BB5]] ]
; IR-NEXT: [[TMP5]] = phi i32 [ [[MY_TMP21:%.*]], [[BB4]] ], [ undef, [[BB5]] ]
; IR-NEXT: call void @llvm.amdgcn.end.cf.i64(i64 [[TMP2]])
; IR-NEXT: [[TMP6]] = call i64 @llvm.amdgcn.if.break.i64(i1 [[TMP4]], i64 [[PHI_BROKEN]])
; IR-NEXT: br label [[BB10]]
; IR: bb13:
; IR-NEXT: [[MY_TMP14:%.*]] = phi i1 [ [[MY_TMP22]], [[BB3]] ], [ true, [[BB8]] ]
; IR-NEXT: [[MY_TMP15:%.*]] = bitcast i64 [[MY_TMP2]] to <2 x i32>
; IR-NEXT: br i1 [[MY_TMP14]], label [[BB16:%.*]], label [[BB20:%.*]]
; IR: bb16:
; IR-NEXT: [[MY_TMP17:%.*]] = extractelement <2 x i32> [[MY_TMP15]], i64 1
; IR-NEXT: [[MY_TMP18:%.*]] = getelementptr inbounds i32, i32 addrspace(3)* undef, i32 [[MY_TMP17]]
; IR-NEXT: [[MY_TMP19:%.*]] = load volatile i32, i32 addrspace(3)* [[MY_TMP18]], align 4
; IR-NEXT: br label [[BB20]]
; IR: bb20:
; IR-NEXT: [[MY_TMP21]] = phi i32 [ [[MY_TMP19]], [[BB16]] ], [ 0, [[BB13]] ]
; IR-NEXT: [[MY_TMP22]] = phi i1 [ false, [[BB16]] ], [ [[MY_TMP14]], [[BB13]] ]
; IR-NEXT: br label [[BB9]]
; IR: bb23:
; IR-NEXT: call void @llvm.amdgcn.end.cf.i64(i64 [[TMP6]])
; IR-NEXT: ret void
;
bb:
%my.tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%my.tmp1 = getelementptr inbounds i64, i64 addrspace(3)* %arg, i32 %my.tmp
%my.tmp2 = load volatile i64, i64 addrspace(3)* %my.tmp1
br label %bb5
bb3: ; preds = %bb9
br i1 true, label %bb4, label %bb13
bb4: ; preds = %bb3
br label %bb10
bb5: ; preds = %bb10, %bb
%my.tmp6 = phi i32 [ 0, %bb ], [ %my.tmp11, %bb10 ]
%my.tmp7 = icmp eq i32 %my.tmp6, 1
br i1 %my.tmp7, label %bb8, label %bb10
bb8: ; preds = %bb5
br label %bb13
bb9: ; preds = %bb20, %bb9
br i1 false, label %bb3, label %bb9
bb10: ; preds = %bb5, %bb4
%my.tmp11 = phi i32 [ %my.tmp21, %bb4 ], [ undef, %bb5 ]
%my.tmp12 = phi i1 [ %my.tmp22, %bb4 ], [ true, %bb5 ]
br i1 %my.tmp12, label %bb23, label %bb5
bb13: ; preds = %bb8, %bb3
%my.tmp14 = phi i1 [ %my.tmp22, %bb3 ], [ true, %bb8 ]
%my.tmp15 = bitcast i64 %my.tmp2 to <2 x i32>
br i1 %my.tmp14, label %bb16, label %bb20
bb16: ; preds = %bb13
%my.tmp17 = extractelement <2 x i32> %my.tmp15, i64 1
%my.tmp18 = getelementptr inbounds i32, i32 addrspace(3)* undef, i32 %my.tmp17
%my.tmp19 = load volatile i32, i32 addrspace(3)* %my.tmp18
br label %bb20
bb20: ; preds = %bb16, %bb13
%my.tmp21 = phi i32 [ %my.tmp19, %bb16 ], [ 0, %bb13 ]
%my.tmp22 = phi i1 [ false, %bb16 ], [ %my.tmp14, %bb13 ]
br label %bb9
bb23: ; preds = %bb10
ret void
}
; Earlier version of above, before a run of the structurizer.
define amdgpu_kernel void @nested_loop_conditions(i64 addrspace(1)* nocapture %arg) #0 {
; GCN-LABEL: nested_loop_conditions:
; GCN: ; %bb.0: ; %bb
; GCN-NEXT: s_mov_b32 s3, 0xf000
; GCN-NEXT: s_mov_b32 s2, -1
; GCN-NEXT: buffer_load_dword v0, off, s[0:3], 0 glc
; GCN-NEXT: s_waitcnt vmcnt(0)
; GCN-NEXT: v_cmp_lt_i32_e32 vcc, 8, v0
; GCN-NEXT: s_cbranch_vccnz .LBB1_6
; GCN-NEXT: ; %bb.1: ; %bb14.lr.ph
; GCN-NEXT: s_load_dword s4, s[0:1], 0x0
; GCN-NEXT: s_branch .LBB1_3
; GCN-NEXT: .LBB1_2: ; %Flow
; GCN-NEXT: ; in Loop: Header=BB1_3 Depth=1
; GCN-NEXT: s_and_b64 vcc, exec, s[0:1]
; GCN-NEXT: s_waitcnt lgkmcnt(0)
; GCN-NEXT: s_mov_b64 vcc, vcc
; GCN-NEXT: s_cbranch_vccnz .LBB1_6
; GCN-NEXT: .LBB1_3: ; %bb14
; GCN-NEXT: ; =>This Loop Header: Depth=1
; GCN-NEXT: ; Child Loop BB1_4 Depth 2
; GCN-NEXT: s_waitcnt lgkmcnt(0)
; GCN-NEXT: s_cmp_lg_u32 s4, 1
; GCN-NEXT: s_mov_b64 s[0:1], -1
; GCN-NEXT: ; implicit-def: $sgpr4
; GCN-NEXT: s_cbranch_scc1 .LBB1_2
; GCN-NEXT: .LBB1_4: ; %bb18
; GCN-NEXT: ; Parent Loop BB1_3 Depth=1
; GCN-NEXT: ; => This Inner Loop Header: Depth=2
; GCN-NEXT: buffer_load_dword v0, off, s[0:3], 0 glc
; GCN-NEXT: s_waitcnt vmcnt(0)
; GCN-NEXT: v_cmp_lt_i32_e32 vcc, 8, v0
; GCN-NEXT: s_cbranch_vccnz .LBB1_4
; GCN-NEXT: ; %bb.5: ; %bb21
; GCN-NEXT: ; in Loop: Header=BB1_3 Depth=1
; GCN-NEXT: s_load_dword s4, s[0:1], 0x0
; GCN-NEXT: buffer_load_dword v0, off, s[0:3], 0 glc
; GCN-NEXT: s_waitcnt vmcnt(0)
; GCN-NEXT: v_cmp_lt_i32_e64 s[0:1], 8, v0
; GCN-NEXT: s_branch .LBB1_2
; GCN-NEXT: .LBB1_6: ; %bb31
; GCN-NEXT: v_mov_b32_e32 v0, 0
; GCN-NEXT: buffer_store_dword v0, off, s[0:3], 0
; GCN-NEXT: s_waitcnt vmcnt(0)
; GCN-NEXT: s_endpgm
; IR-LABEL: @nested_loop_conditions(
; IR-NEXT: bb:
; IR-NEXT: [[MY_TMP:%.*]] = tail call i32 @llvm.amdgcn.workitem.id.x() #[[ATTR4]]
; IR-NEXT: [[MY_TMP1:%.*]] = zext i32 [[MY_TMP]] to i64
; IR-NEXT: [[MY_TMP2:%.*]] = getelementptr inbounds i64, i64 addrspace(1)* [[ARG:%.*]], i64 [[MY_TMP1]]
; IR-NEXT: [[MY_TMP3:%.*]] = load i64, i64 addrspace(1)* [[MY_TMP2]], align 16
; IR-NEXT: [[MY_TMP932:%.*]] = load <4 x i32>, <4 x i32> addrspace(1)* undef, align 16
; IR-NEXT: [[MY_TMP1033:%.*]] = extractelement <4 x i32> [[MY_TMP932]], i64 0
; IR-NEXT: [[MY_TMP1134:%.*]] = load volatile i32, i32 addrspace(1)* undef, align 4
; IR-NEXT: [[MY_TMP1235:%.*]] = icmp slt i32 [[MY_TMP1134]], 9
; IR-NEXT: br i1 [[MY_TMP1235]], label [[BB14_LR_PH:%.*]], label [[FLOW:%.*]]
; IR: bb14.lr.ph:
; IR-NEXT: br label [[BB14:%.*]]
; IR: Flow3:
; IR-NEXT: call void @llvm.amdgcn.end.cf.i64(i64 [[TMP20:%.*]])
; IR-NEXT: [[TMP0:%.*]] = call { i1, i64 } @llvm.amdgcn.if.i64(i1 [[TMP14:%.*]])
; IR-NEXT: [[TMP1:%.*]] = extractvalue { i1, i64 } [[TMP0]], 0
; IR-NEXT: [[TMP2:%.*]] = extractvalue { i1, i64 } [[TMP0]], 1
; IR-NEXT: br i1 [[TMP1]], label [[BB4_BB13_CRIT_EDGE:%.*]], label [[FLOW4:%.*]]
; IR: bb4.bb13_crit_edge:
; IR-NEXT: br label [[FLOW4]]
; IR: Flow4:
; IR-NEXT: [[TMP3:%.*]] = phi i1 [ true, [[BB4_BB13_CRIT_EDGE]] ], [ false, [[FLOW3:%.*]] ]
; IR-NEXT: call void @llvm.amdgcn.end.cf.i64(i64 [[TMP2]])
; IR-NEXT: br label [[FLOW]]
; IR: bb13:
; IR-NEXT: br label [[BB31:%.*]]
; IR: Flow:
; IR-NEXT: [[TMP4:%.*]] = phi i1 [ [[TMP3]], [[FLOW4]] ], [ true, [[BB:%.*]] ]
; IR-NEXT: [[TMP5:%.*]] = call { i1, i64 } @llvm.amdgcn.if.i64(i1 [[TMP4]])
; IR-NEXT: [[TMP6:%.*]] = extractvalue { i1, i64 } [[TMP5]], 0
; IR-NEXT: [[TMP7:%.*]] = extractvalue { i1, i64 } [[TMP5]], 1
; IR-NEXT: br i1 [[TMP6]], label [[BB13:%.*]], label [[BB31]]
; IR: bb14:
; IR-NEXT: [[PHI_BROKEN:%.*]] = phi i64 [ [[TMP16:%.*]], [[FLOW1:%.*]] ], [ 0, [[BB14_LR_PH]] ]
; IR-NEXT: [[MY_TMP1037:%.*]] = phi i32 [ [[MY_TMP1033]], [[BB14_LR_PH]] ], [ [[TMP12:%.*]], [[FLOW1]] ]
; IR-NEXT: [[MY_TMP936:%.*]] = phi <4 x i32> [ [[MY_TMP932]], [[BB14_LR_PH]] ], [ [[TMP11:%.*]], [[FLOW1]] ]
; IR-NEXT: [[MY_TMP15:%.*]] = icmp eq i32 [[MY_TMP1037]], 1
; IR-NEXT: [[TMP8:%.*]] = call { i1, i64 } @llvm.amdgcn.if.i64(i1 [[MY_TMP15]])
; IR-NEXT: [[TMP9:%.*]] = extractvalue { i1, i64 } [[TMP8]], 0
; IR-NEXT: [[TMP10:%.*]] = extractvalue { i1, i64 } [[TMP8]], 1
; IR-NEXT: br i1 [[TMP9]], label [[BB16:%.*]], label [[FLOW1]]
; IR: bb16:
; IR-NEXT: [[MY_TMP17:%.*]] = bitcast i64 [[MY_TMP3]] to <2 x i32>
; IR-NEXT: br label [[BB18:%.*]]
; IR: Flow1:
; IR-NEXT: [[TMP11]] = phi <4 x i32> [ [[MY_TMP9:%.*]], [[BB21:%.*]] ], [ undef, [[BB14]] ]
; IR-NEXT: [[TMP12]] = phi i32 [ [[MY_TMP10:%.*]], [[BB21]] ], [ undef, [[BB14]] ]
; IR-NEXT: [[TMP13:%.*]] = phi i1 [ [[MY_TMP12:%.*]], [[BB21]] ], [ true, [[BB14]] ]
; IR-NEXT: [[TMP14]] = phi i1 [ [[MY_TMP12]], [[BB21]] ], [ false, [[BB14]] ]
; IR-NEXT: [[TMP15:%.*]] = phi i1 [ false, [[BB21]] ], [ true, [[BB14]] ]
; IR-NEXT: call void @llvm.amdgcn.end.cf.i64(i64 [[TMP10]])
; IR-NEXT: [[TMP16]] = call i64 @llvm.amdgcn.if.break.i64(i1 [[TMP13]], i64 [[PHI_BROKEN]])
; IR-NEXT: [[TMP17:%.*]] = call i1 @llvm.amdgcn.loop.i64(i64 [[TMP16]])
; IR-NEXT: br i1 [[TMP17]], label [[FLOW2:%.*]], label [[BB14]]
; IR: bb18:
; IR-NEXT: [[MY_TMP19:%.*]] = load volatile i32, i32 addrspace(1)* undef, align 4
; IR-NEXT: [[MY_TMP20:%.*]] = icmp slt i32 [[MY_TMP19]], 9
; IR-NEXT: br i1 [[MY_TMP20]], label [[BB21]], label [[BB18]]
; IR: bb21:
; IR-NEXT: [[MY_TMP22:%.*]] = extractelement <2 x i32> [[MY_TMP17]], i64 1
; IR-NEXT: [[MY_TMP23:%.*]] = lshr i32 [[MY_TMP22]], 16
; IR-NEXT: [[MY_TMP24:%.*]] = select i1 undef, i32 undef, i32 [[MY_TMP23]]
; IR-NEXT: [[MY_TMP25:%.*]] = uitofp i32 [[MY_TMP24]] to float
; IR-NEXT: [[MY_TMP26:%.*]] = fmul float [[MY_TMP25]], 0x3EF0001000000000
; IR-NEXT: [[MY_TMP27:%.*]] = fsub float [[MY_TMP26]], undef
; IR-NEXT: [[MY_TMP28:%.*]] = fcmp olt float [[MY_TMP27]], 5.000000e-01
; IR-NEXT: [[MY_TMP29:%.*]] = select i1 [[MY_TMP28]], i64 1, i64 2
; IR-NEXT: [[MY_TMP30:%.*]] = extractelement <4 x i32> [[MY_TMP936]], i64 [[MY_TMP29]]
; IR-NEXT: [[MY_TMP7:%.*]] = zext i32 [[MY_TMP30]] to i64
; IR-NEXT: [[MY_TMP8:%.*]] = getelementptr inbounds <4 x i32>, <4 x i32> addrspace(1)* undef, i64 [[MY_TMP7]]
; IR-NEXT: [[MY_TMP9]] = load <4 x i32>, <4 x i32> addrspace(1)* [[MY_TMP8]], align 16
; IR-NEXT: [[MY_TMP10]] = extractelement <4 x i32> [[MY_TMP9]], i64 0
; IR-NEXT: [[MY_TMP11:%.*]] = load volatile i32, i32 addrspace(1)* undef, align 4
; IR-NEXT: [[MY_TMP12]] = icmp sge i32 [[MY_TMP11]], 9
; IR-NEXT: br label [[FLOW1]]
; IR: Flow2:
; IR-NEXT: call void @llvm.amdgcn.end.cf.i64(i64 [[TMP16]])
; IR-NEXT: [[TMP18:%.*]] = call { i1, i64 } @llvm.amdgcn.if.i64(i1 [[TMP15]])
; IR-NEXT: [[TMP19:%.*]] = extractvalue { i1, i64 } [[TMP18]], 0
; IR-NEXT: [[TMP20]] = extractvalue { i1, i64 } [[TMP18]], 1
; IR-NEXT: br i1 [[TMP19]], label [[BB31_LOOPEXIT:%.*]], label [[FLOW3]]
; IR: bb31.loopexit:
; IR-NEXT: br label [[FLOW3]]
; IR: bb31:
; IR-NEXT: call void @llvm.amdgcn.end.cf.i64(i64 [[TMP7]])
; IR-NEXT: store volatile i32 0, i32 addrspace(1)* undef, align 4
; IR-NEXT: ret void
;
bb:
%my.tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%my.tmp1 = zext i32 %my.tmp to i64
%my.tmp2 = getelementptr inbounds i64, i64 addrspace(1)* %arg, i64 %my.tmp1
%my.tmp3 = load i64, i64 addrspace(1)* %my.tmp2, align 16
%my.tmp932 = load <4 x i32>, <4 x i32> addrspace(1)* undef, align 16
%my.tmp1033 = extractelement <4 x i32> %my.tmp932, i64 0
%my.tmp1134 = load volatile i32, i32 addrspace(1)* undef
%my.tmp1235 = icmp slt i32 %my.tmp1134, 9
br i1 %my.tmp1235, label %bb14.lr.ph, label %bb13
bb14.lr.ph: ; preds = %bb
br label %bb14
bb4.bb13_crit_edge: ; preds = %bb21
br label %bb13
bb13: ; preds = %bb4.bb13_crit_edge, %bb
br label %bb31
bb14: ; preds = %bb21, %bb14.lr.ph
%my.tmp1037 = phi i32 [ %my.tmp1033, %bb14.lr.ph ], [ %my.tmp10, %bb21 ]
%my.tmp936 = phi <4 x i32> [ %my.tmp932, %bb14.lr.ph ], [ %my.tmp9, %bb21 ]
%my.tmp15 = icmp eq i32 %my.tmp1037, 1
br i1 %my.tmp15, label %bb16, label %bb31.loopexit
bb16: ; preds = %bb14
%my.tmp17 = bitcast i64 %my.tmp3 to <2 x i32>
br label %bb18
bb18: ; preds = %bb18, %bb16
%my.tmp19 = load volatile i32, i32 addrspace(1)* undef
%my.tmp20 = icmp slt i32 %my.tmp19, 9
br i1 %my.tmp20, label %bb21, label %bb18
bb21: ; preds = %bb18
%my.tmp22 = extractelement <2 x i32> %my.tmp17, i64 1
%my.tmp23 = lshr i32 %my.tmp22, 16
%my.tmp24 = select i1 undef, i32 undef, i32 %my.tmp23
%my.tmp25 = uitofp i32 %my.tmp24 to float
%my.tmp26 = fmul float %my.tmp25, 0x3EF0001000000000
%my.tmp27 = fsub float %my.tmp26, undef
%my.tmp28 = fcmp olt float %my.tmp27, 5.000000e-01
%my.tmp29 = select i1 %my.tmp28, i64 1, i64 2
%my.tmp30 = extractelement <4 x i32> %my.tmp936, i64 %my.tmp29
%my.tmp7 = zext i32 %my.tmp30 to i64
%my.tmp8 = getelementptr inbounds <4 x i32>, <4 x i32> addrspace(1)* undef, i64 %my.tmp7
%my.tmp9 = load <4 x i32>, <4 x i32> addrspace(1)* %my.tmp8, align 16
%my.tmp10 = extractelement <4 x i32> %my.tmp9, i64 0
%my.tmp11 = load volatile i32, i32 addrspace(1)* undef
%my.tmp12 = icmp slt i32 %my.tmp11, 9
br i1 %my.tmp12, label %bb14, label %bb4.bb13_crit_edge
bb31.loopexit: ; preds = %bb14
br label %bb31
bb31: ; preds = %bb31.loopexit, %bb13
store volatile i32 0, i32 addrspace(1)* undef
ret void
}
declare i32 @llvm.amdgcn.workitem.id.x() #1
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }
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