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llvm-mirror/test/CodeGen/AMDGPU/cttz_zero_undef.ll
Craig Topper 8371f1254e [DAGCombiner][AMDGPU][X86] Turn cttz/ctlz into cttz_zero_undef/ctlz_zero_undef if we can prove the input is never zero 
X86 currently has a late DAG combine after cttz/ctlz are turned into BSR+BSF+CMOV to detect this and remove the CMOV. But we should be able to do this much earlier and avoid creating the cmov all together.

For the changed AMDGPU test case it appears that previously the i8 cttz was type legalized to i16 which introduced an OR with 256 in order to limit the result to 8 on the widened type. At this point the result is known to never be zero, but nothing checked that. Then operation legalization is told to promote all i16 cttz to i32. This introduces an extend and a truncate and another OR with 65536 to limit the result to 16. With the DAG combiner change we are able to prevent the creation of the second OR since the opcode will have been changed to cttz_zero_undef after the first OR. I the lack of the OR caused the instruction to change to v_ffbl_b32_sdwa

Differential Revision: https://reviews.llvm.org/D42985

llvm-svn: 324427
2018-02-06 23:54:37 +00:00

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; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=SI -check-prefix=SI-NOSDWA -check-prefix=FUNC %s
; RUN: llc -march=amdgcn -mcpu=tonga -mattr=-flat-for-global -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=SI -check-prefix=SI-SDWA -check-prefix=FUNC %s
; RUN: llc -march=r600 -mcpu=cypress -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=EG -check-prefix=FUNC %s
declare i7 @llvm.cttz.i7(i7, i1) nounwind readnone
declare i8 @llvm.cttz.i8(i8, i1) nounwind readnone
declare i16 @llvm.cttz.i16(i16, i1) nounwind readnone
declare i32 @llvm.cttz.i32(i32, i1) nounwind readnone
declare i64 @llvm.cttz.i64(i64, i1) nounwind readnone
declare <2 x i32> @llvm.cttz.v2i32(<2 x i32>, i1) nounwind readnone
declare <4 x i32> @llvm.cttz.v4i32(<4 x i32>, i1) nounwind readnone
declare i32 @llvm.r600.read.tidig.x() nounwind readnone
; FUNC-LABEL: {{^}}s_cttz_zero_undef_i32:
; SI: s_load_dword [[VAL:s[0-9]+]],
; SI: s_ff1_i32_b32 [[SRESULT:s[0-9]+]], [[VAL]]
; SI: v_mov_b32_e32 [[VRESULT:v[0-9]+]], [[SRESULT]]
; SI: buffer_store_dword [[VRESULT]],
; SI: s_endpgm
; EG: MEM_RAT_CACHELESS STORE_RAW [[RESULT:T[0-9]+\.[XYZW]]]
; EG: FFBL_INT {{\*? *}}[[RESULT]]
define amdgpu_kernel void @s_cttz_zero_undef_i32(i32 addrspace(1)* noalias %out, i32 %val) nounwind {
%cttz = call i32 @llvm.cttz.i32(i32 %val, i1 true) nounwind readnone
store i32 %cttz, i32 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}v_cttz_zero_undef_i32:
; SI: {{buffer|flat}}_load_dword [[VAL:v[0-9]+]],
; SI: v_ffbl_b32_e32 [[RESULT:v[0-9]+]], [[VAL]]
; SI: buffer_store_dword [[RESULT]],
; SI: s_endpgm
; EG: MEM_RAT_CACHELESS STORE_RAW [[RESULT:T[0-9]+\.[XYZW]]]
; EG: FFBL_INT {{\*? *}}[[RESULT]]
define amdgpu_kernel void @v_cttz_zero_undef_i32(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %valptr) nounwind {
%tid = call i32 @llvm.r600.read.tidig.x()
%in.gep = getelementptr i32, i32 addrspace(1)* %valptr, i32 %tid
%val = load i32, i32 addrspace(1)* %in.gep, align 4
%cttz = call i32 @llvm.cttz.i32(i32 %val, i1 true) nounwind readnone
store i32 %cttz, i32 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}v_cttz_zero_undef_v2i32:
; SI: {{buffer|flat}}_load_dwordx2
; SI: v_ffbl_b32_e32
; SI: v_ffbl_b32_e32
; SI: buffer_store_dwordx2
; SI: s_endpgm
; EG: MEM_RAT_CACHELESS STORE_RAW [[RESULT:T[0-9]+]]{{\.[XYZW]}}
; EG: FFBL_INT {{\*? *}}[[RESULT]]
; EG: FFBL_INT {{\*? *}}[[RESULT]]
define amdgpu_kernel void @v_cttz_zero_undef_v2i32(<2 x i32> addrspace(1)* noalias %out, <2 x i32> addrspace(1)* noalias %valptr) nounwind {
%tid = call i32 @llvm.r600.read.tidig.x()
%in.gep = getelementptr <2 x i32>, <2 x i32> addrspace(1)* %valptr, i32 %tid
%val = load <2 x i32>, <2 x i32> addrspace(1)* %in.gep, align 8
%cttz = call <2 x i32> @llvm.cttz.v2i32(<2 x i32> %val, i1 true) nounwind readnone
store <2 x i32> %cttz, <2 x i32> addrspace(1)* %out, align 8
ret void
}
; FUNC-LABEL: {{^}}v_cttz_zero_undef_v4i32:
; SI: {{buffer|flat}}_load_dwordx4
; SI: v_ffbl_b32_e32
; SI: v_ffbl_b32_e32
; SI: v_ffbl_b32_e32
; SI: v_ffbl_b32_e32
; SI: buffer_store_dwordx4
; SI: s_endpgm
; EG: MEM_RAT_CACHELESS STORE_RAW [[RESULT:T[0-9]+]]{{\.[XYZW]}}
; EG: FFBL_INT {{\*? *}}[[RESULT]]
; EG: FFBL_INT {{\*? *}}[[RESULT]]
; EG: FFBL_INT {{\*? *}}[[RESULT]]
; EG: FFBL_INT {{\*? *}}[[RESULT]]
define amdgpu_kernel void @v_cttz_zero_undef_v4i32(<4 x i32> addrspace(1)* noalias %out, <4 x i32> addrspace(1)* noalias %valptr) nounwind {
%tid = call i32 @llvm.r600.read.tidig.x()
%in.gep = getelementptr <4 x i32>, <4 x i32> addrspace(1)* %valptr, i32 %tid
%val = load <4 x i32>, <4 x i32> addrspace(1)* %in.gep, align 16
%cttz = call <4 x i32> @llvm.cttz.v4i32(<4 x i32> %val, i1 true) nounwind readnone
store <4 x i32> %cttz, <4 x i32> addrspace(1)* %out, align 16
ret void
}
; FUNC-LABEL: {{^}}s_cttz_zero_undef_i8_with_select:
; SI: s_ff1_i32_b32 s{{[0-9]+}}, s{{[0-9]+}}
; EG: MEM_RAT MSKOR
; EG: FFBL_INT
define amdgpu_kernel void @s_cttz_zero_undef_i8_with_select(i8 addrspace(1)* noalias %out, i8 %val) nounwind {
%cttz = tail call i8 @llvm.cttz.i8(i8 %val, i1 true) nounwind readnone
%cttz_ret = icmp ne i8 %val, 0
%ret = select i1 %cttz_ret, i8 %cttz, i8 32
store i8 %cttz, i8 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}s_cttz_zero_undef_i16_with_select:
; SI: s_ff1_i32_b32 s{{[0-9]+}}, s{{[0-9]+}}
; EG: MEM_RAT MSKOR
; EG: FFBL_INT
define amdgpu_kernel void @s_cttz_zero_undef_i16_with_select(i16 addrspace(1)* noalias %out, i16 %val) nounwind {
%cttz = tail call i16 @llvm.cttz.i16(i16 %val, i1 true) nounwind readnone
%cttz_ret = icmp ne i16 %val, 0
%ret = select i1 %cttz_ret, i16 %cttz, i16 32
store i16 %cttz, i16 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}s_cttz_zero_undef_i32_with_select:
; SI: s_ff1_i32_b32
; EG: MEM_RAT_CACHELESS STORE_RAW [[RESULT:T[0-9]+\.[XYZW]]]
; EG: FFBL_INT {{\*? *}}[[RESULT]]
define amdgpu_kernel void @s_cttz_zero_undef_i32_with_select(i32 addrspace(1)* noalias %out, i32 %val) nounwind {
%cttz = tail call i32 @llvm.cttz.i32(i32 %val, i1 true) nounwind readnone
%cttz_ret = icmp ne i32 %val, 0
%ret = select i1 %cttz_ret, i32 %cttz, i32 32
store i32 %cttz, i32 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}s_cttz_zero_undef_i64_with_select:
; SI: s_ff1_i32_b32 s{{[0-9]+}}, s{{[0-9]+}}
; SI: s_ff1_i32_b32 s{{[0-9]+}}, s{{[0-9]+}}
; EG: MEM_RAT_CACHELESS STORE_RAW [[RESULT:T[0-9]+\.[XYZW]]]
define amdgpu_kernel void @s_cttz_zero_undef_i64_with_select(i64 addrspace(1)* noalias %out, i64 %val) nounwind {
%cttz = tail call i64 @llvm.cttz.i64(i64 %val, i1 true) nounwind readnone
%cttz_ret = icmp ne i64 %val, 0
%ret = select i1 %cttz_ret, i64 %cttz, i64 32
store i64 %cttz, i64 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}v_cttz_zero_undef_i8_with_select:
; SI-NOSDWA: v_ffbl_b32_e32 v{{[0-9]+}}, v{{[0-9]+}}
; SI-SDWA: v_ffbl_b32_sdwa
; EG: MEM_RAT MSKOR
define amdgpu_kernel void @v_cttz_zero_undef_i8_with_select(i8 addrspace(1)* noalias %out, i8 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i8, i8 addrspace(1)* %arrayidx, align 1
%cttz = tail call i8 @llvm.cttz.i8(i8 %val, i1 true) nounwind readnone
%cttz_ret = icmp ne i8 %val, 0
%ret = select i1 %cttz_ret, i8 %cttz, i8 32
store i8 %ret, i8 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}v_cttz_zero_undef_i16_with_select:
; SI-NOSDWA: v_ffbl_b32_e32 v{{[0-9]+}}, v{{[0-9]+}}
; SI-SDWA: v_ffbl_b32_sdwa
; EG: MEM_RAT MSKOR
define amdgpu_kernel void @v_cttz_zero_undef_i16_with_select(i16 addrspace(1)* noalias %out, i16 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i16, i16 addrspace(1)* %arrayidx, align 1
%cttz = tail call i16 @llvm.cttz.i16(i16 %val, i1 true) nounwind readnone
%cttz_ret = icmp ne i16 %val, 0
%ret = select i1 %cttz_ret, i16 %cttz, i16 32
store i16 %ret, i16 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}v_cttz_zero_undef_i32_with_select:
; SI: v_ffbl_b32_e32 v{{[0-9]+}}, v{{[0-9]+}}
; SI: v_cmp_ne_u32_e32 vcc, 0
; EG: MEM_RAT_CACHELESS STORE_RAW [[RESULT:T[0-9]+\.[XYZW]]]
define amdgpu_kernel void @v_cttz_zero_undef_i32_with_select(i32 addrspace(1)* noalias %out, i32 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i32, i32 addrspace(1)* %arrayidx, align 1
%cttz = tail call i32 @llvm.cttz.i32(i32 %val, i1 true) nounwind readnone
%cttz_ret = icmp ne i32 %val, 0
%ret = select i1 %cttz_ret, i32 %cttz, i32 32
store i32 %ret, i32 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}v_cttz_zero_undef_i64_with_select:
; SI-NOSDWA: v_or_b32_e32
; SI-NOSDWA: v_or_b32_e32
; SI-NOSDWA: v_or_b32_e32
; SI-SDWA: v_or_b32_sdwa
; SI-NOSDWA: v_or_b32_e32
; SI-SDWA: v_or_b32_sdwa
; SI: v_or_b32_e32 [[VAL1:v[0-9]+]], v{{[0-9]+}}, v{{[0-9]+}}
; SI: v_or_b32_e32 [[VAL2:v[0-9]+]], v{{[0-9]+}}, v{{[0-9]+}}
; SI-DAG: v_ffbl_b32_e32 v{{[0-9]+}}, [[VAL1]]
; SI-DAG: v_ffbl_b32_e32 v{{[0-9]+}}, [[VAL2]]
; SI: v_cmp_eq_u32_e32 vcc, 0
; SI: v_cmp_ne_u64_e32 vcc, 0
; EG: MEM_RAT_CACHELESS STORE_RAW [[RESULT:T[0-9]+\.[XYZW]]]
define amdgpu_kernel void @v_cttz_zero_undef_i64_with_select(i64 addrspace(1)* noalias %out, i64 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i64, i64 addrspace(1)* %arrayidx, align 1
%cttz = tail call i64 @llvm.cttz.i64(i64 %val, i1 true) nounwind readnone
%cttz_ret = icmp ne i64 %val, 0
%ret = select i1 %cttz_ret, i64 %cttz, i64 32
store i64 %ret, i64 addrspace(1)* %out, align 4
ret void
}
; FUNC-LABEL: {{^}}v_cttz_i32_sel_eq_neg1:
; SI: v_ffbl_b32_e32 v{{[0-9]+}}, [[VAL:v[0-9]+]]
; SI: v_cmp_ne_u32_e32 vcc, 0, [[VAL]]
; SI: s_endpgm
; EG: MEM_RAT_CACHELESS STORE_RAW
; EG: FFBL_INT
define amdgpu_kernel void @v_cttz_i32_sel_eq_neg1(i32 addrspace(1)* noalias %out, i32 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i32, i32 addrspace(1)* %arrayidx, align 1
%ctlz = call i32 @llvm.cttz.i32(i32 %val, i1 false) nounwind readnone
%cmp = icmp eq i32 %val, 0
%sel = select i1 %cmp, i32 -1, i32 %ctlz
store i32 %sel, i32 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_cttz_i32_sel_ne_neg1:
; SI: v_ffbl_b32_e32 v{{[0-9]+}}, [[VAL:v[0-9]+]]
; SI: v_cmp_ne_u32_e32 vcc, 0, [[VAL]]
; SI: s_endpgm
; EG: MEM_RAT_CACHELESS STORE_RAW
; EG: FFBL_INT
define amdgpu_kernel void @v_cttz_i32_sel_ne_neg1(i32 addrspace(1)* noalias %out, i32 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i32, i32 addrspace(1)* %arrayidx, align 1
%ctlz = call i32 @llvm.cttz.i32(i32 %val, i1 false) nounwind readnone
%cmp = icmp ne i32 %val, 0
%sel = select i1 %cmp, i32 %ctlz, i32 -1
store i32 %sel, i32 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_cttz_i32_sel_ne_bitwidth:
; SI: v_ffbl_b32_e32 v{{[0-9]+}}, v{{[0-9]+}}
; SI: v_cmp
; SI: v_cndmask
; SI: s_endpgm
; EG: MEM_RAT_CACHELESS STORE_RAW
; EG: FFBL_INT
define amdgpu_kernel void @v_cttz_i32_sel_ne_bitwidth(i32 addrspace(1)* noalias %out, i32 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i32, i32 addrspace(1)* %arrayidx, align 1
%ctlz = call i32 @llvm.cttz.i32(i32 %val, i1 false) nounwind readnone
%cmp = icmp ne i32 %ctlz, 32
%sel = select i1 %cmp, i32 %ctlz, i32 -1
store i32 %sel, i32 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_cttz_i8_sel_eq_neg1:
; SI: {{buffer|flat}}_load_ubyte
; SI-NOSDWA: v_ffbl_b32_e32 v{{[0-9]+}}, v{{[0-9]+}}
; SI-SDWA: v_ffbl_b32_sdwa
; EG: MEM_RAT MSKOR
; EG: FFBL_INT
define amdgpu_kernel void @v_cttz_i8_sel_eq_neg1(i8 addrspace(1)* noalias %out, i8 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i8, i8 addrspace(1)* %arrayidx, align 1
%ctlz = call i8 @llvm.cttz.i8(i8 %val, i1 false) nounwind readnone
%cmp = icmp eq i8 %val, 0
%sel = select i1 %cmp, i8 -1, i8 %ctlz
store i8 %sel, i8 addrspace(1)* %out
ret void
}
; FUNC-LABEL: {{^}}v_cttz_i16_sel_eq_neg1:
; SI: {{buffer|flat}}_load_ubyte
; SI: v_ffbl_b32_e32 v{{[0-9]+}}, v{{[0-9]+}}
; SI: buffer_store_short
; EG: MEM_RAT MSKOR
; EG: FFBL_INT
define amdgpu_kernel void @v_cttz_i16_sel_eq_neg1(i16 addrspace(1)* noalias %out, i16 addrspace(1)* nocapture readonly %arrayidx) nounwind {
%val = load i16, i16 addrspace(1)* %arrayidx, align 1
%ctlz = call i16 @llvm.cttz.i16(i16 %val, i1 false) nounwind readnone
%cmp = icmp eq i16 %val, 0
%sel = select i1 %cmp, i16 -1, i16 %ctlz
store i16 %sel, i16 addrspace(1)* %out
ret void
}
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