AMDGPU: Use scalar operations for f16 fabs/fneg patterns

[arsenm]

Summary

Fixes unnecessary differences between subtargets.

[arsenm]

Eliminate commute difference

[rampitec]

LGTM

[arsenm]

r334184

lib/Target/AMDGPU/SIInstructions.td

(REG_SEQUENCE VReg_64,
     sub0,
     (V_OR_B32_e32 (i32 (EXTRACT_SUBREG f64:$src, sub1)),
                   (V_MOV_B32_e32 (i32 0x80000000))), // Set sign bit.
     sub1)
 >;
 
 def : GCNPat <
   (fabs f32:$src),
-  (V_AND_B32_e64 $src, (V_MOV_B32_e32 (i32 0x7fffffff)))
+  (S_AND_B32 $src, (S_MOV_B32 (i32 0x7fffffff)))
 >;
 
 def : GCNPat <
   (fneg f32:$src),
   (V_XOR_B32_e32 $src, (V_MOV_B32_e32 (i32 0x80000000)))
 >;
 
 def : GCNPat <

 def : GCNPat <
   (fcopysign f16:$src0, f64:$src1),
   (V_BFI_B32 (S_MOV_B32 (i32 0x00007fff)), $src0,
              (V_LSHRREV_B32_e64 (i32 16), (EXTRACT_SUBREG $src1, sub1)))
 >;
 
 def : GCNPat <
   (fneg f16:$src),
-  (V_XOR_B32_e32 $src, (V_MOV_B32_e32 (i32 0x00008000)))
+  (S_XOR_B32 $src, (S_MOV_B32 (i32 0x00008000)))
 >;
 
 def : GCNPat <
   (fabs f16:$src),
-  (V_AND_B32_e64 $src, (V_MOV_B32_e32 (i32 0x00007fff)))
+  (S_AND_B32 $src, (S_MOV_B32 (i32 0x00007fff)))
 >;
 
 def : GCNPat <
   (fneg (fabs f16:$src)),
   (S_OR_B32 $src, (S_MOV_B32 (i32 0x00008000))) // Set sign bit
 >;
 
 def : GCNPat <
   (fneg v2f16:$src),
-  (V_XOR_B32_e64 (S_MOV_B32 (i32 0x80008000)), $src)
+  (S_XOR_B32 (S_MOV_B32 (i32 0x80008000)), $src)
 >;
 
 def : GCNPat <
   (fabs v2f16:$src),
-  (V_AND_B32_e64 (S_MOV_B32 (i32 0x7fff7fff)), $src)
+  (S_AND_B32 (S_MOV_B32 (i32 0x7fff7fff)), $src)
 >;
 
 // This is really (fneg (fabs v2f16:$src))
 //
 // fabs is not reported as free because there is modifier for it in
 // VOP3P instructions, so it is turned into the bit op.
 def : GCNPat <
   (fneg (v2f16 (bitconvert (and_oneuse i32:$src, 0x7fff7fff)))),

test/CodeGen/AMDGPU/fabs.f16.ll

 ; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=kaveri -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,CI %s
 ; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=tonga -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,VI,GFX89 %s
 ; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,GFX9,GFX89 %s
 
 ; DAGCombiner will transform:
 ; (fabs (f16 bitcast (i16 a))) => (f16 bitcast (and (i16 a), 0x7FFFFFFF))
 ; unless isFabsFree returns true
 
 ; GCN-LABEL: {{^}}s_fabs_free_f16:
 ; GCN: s_load_dword [[VAL:s[0-9]+]]
-
-; CI: s_and_b32 [[RESULT:s[0-9]+]], [[VAL]], 0x7fff
-; CI: v_mov_b32_e32 [[V_RESULT:v[0-9]+]], [[RESULT]]
-; CI: {{flat|global}}_store_short v{{\[[0-9]+:[0-9]+\]}}, [[V_RESULT]]
-
-; GFX89: v_mov_b32_e32 [[MASK:v[0-9]+]], 0x7fff
-; GFX89: v_and_b32_e32 [[V_RESULT:v[0-9]+]], [[VAL]], [[MASK]]
-; GFX89: {{flat|global}}_store_short v{{\[[0-9]+:[0-9]+\]}}, [[V_RESULT]]
+; GCN: s_and_b32 [[RESULT:s[0-9]+]], [[VAL]], 0x7fff
+; GCN: v_mov_b32_e32 [[V_RESULT:v[0-9]+]], [[RESULT]]
+; GCN: {{flat|global}}_store_short v{{\[[0-9]+:[0-9]+\]}}, [[V_RESULT]]
 define amdgpu_kernel void @s_fabs_free_f16(half addrspace(1)* %out, i16 %in) {
   %bc= bitcast i16 %in to half
   %fabs = call half @llvm.fabs.f16(half %bc)
   store half %fabs, half addrspace(1)* %out
   ret void
 }
 
 ; GCN-LABEL: {{^}}s_fabs_f16:
 ; GCN: s_load_dword [[VAL:s[0-9]+]]
-
-; CI: s_and_b32 [[RESULT:s[0-9]+]], [[VAL]], 0x7fff
-; CI: v_mov_b32_e32 [[V_RESULT:v[0-9]+]], [[RESULT]]
-; CI: {{flat|global}}_store_short v{{\[[0-9]+:[0-9]+\]}}, [[V_RESULT]]
-
-; GFX89: v_mov_b32_e32 [[MASK:v[0-9]+]], 0x7fff
-; GFX89: v_and_b32_e32 [[V_RESULT:v[0-9]+]], [[VAL]], [[MASK]]
-; GFX89: {{flat|global}}_store_short v{{\[[0-9]+:[0-9]+\]}}, [[V_RESULT]]
+; GCN: s_and_b32 [[RESULT:s[0-9]+]], [[VAL]], 0x7fff
+; GCN: v_mov_b32_e32 [[V_RESULT:v[0-9]+]], [[RESULT]]
+; GCN: {{flat|global}}_store_short v{{\[[0-9]+:[0-9]+\]}}, [[V_RESULT]]
 define amdgpu_kernel void @s_fabs_f16(half addrspace(1)* %out, half %in) {
   %fabs = call half @llvm.fabs.f16(half %in)
   store half %fabs, half addrspace(1)* %out
   ret void
 }
 
 ; GCN-LABEL: {{^}}s_fabs_v2f16:
 ; GCN: s_load_dword [[VAL:s[0-9]+]]

test/CodeGen/AMDGPU/fabs.ll

 ; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=SI -check-prefix=FUNC %s
 ; RUN: llc -march=amdgcn -mcpu=tonga -mattr=-flat-for-global -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=VI -check-prefix=FUNC %s
 ; RUN: llc -march=r600 -mcpu=redwood < %s | FileCheck -check-prefix=R600 -check-prefix=FUNC %s
 
 
 ; DAGCombiner will transform:
 ; (fabs (f32 bitcast (i32 a))) => (f32 bitcast (and (i32 a), 0x7FFFFFFF))
 ; unless isFabsFree returns true
 
-; FUNC-LABEL: {{^}}fabs_fn_free:
+; FUNC-LABEL: {{^}}s_fabs_fn_free:
 ; R600-NOT: AND
 ; R600: |PV.{{[XYZW]}}|
 
-; GCN: v_and_b32
-
-define amdgpu_kernel void @fabs_fn_free(float addrspace(1)* %out, i32 %in) {
+; GCN: s_and_b32 s{{[0-9]+}}, s{{[0-9]+}}, 0x7fffffff
+define amdgpu_kernel void @s_fabs_fn_free(float addrspace(1)* %out, i32 %in) {
   %bc= bitcast i32 %in to float
   %fabs = call float @fabs(float %bc)
   store float %fabs, float addrspace(1)* %out
   ret void
 }
 
-; FUNC-LABEL: {{^}}fabs_free:
+; FUNC-LABEL: {{^}}s_fabs_free:
 ; R600-NOT: AND
 ; R600: |PV.{{[XYZW]}}|
 
-; GCN: v_and_b32
-
-define amdgpu_kernel void @fabs_free(float addrspace(1)* %out, i32 %in) {
+; GCN: s_and_b32 s{{[0-9]+}}, s{{[0-9]+}}, 0x7fffffff
+define amdgpu_kernel void @s_fabs_free(float addrspace(1)* %out, i32 %in) {
   %bc= bitcast i32 %in to float
   %fabs = call float @llvm.fabs.f32(float %bc)
   store float %fabs, float addrspace(1)* %out
   ret void
 }
 
-; FUNC-LABEL: {{^}}fabs_f32:
+; FUNC-LABEL: {{^}}s_fabs_f32:
 ; R600: |{{(PV|T[0-9])\.[XYZW]}}|
 
-; GCN: v_and_b32
-define amdgpu_kernel void @fabs_f32(float addrspace(1)* %out, float %in) {
+; GCN: s_and_b32 s{{[0-9]+}}, s{{[0-9]+}}, 0x7fffffff
+define amdgpu_kernel void @s_fabs_f32(float addrspace(1)* %out, float %in) {
   %fabs = call float @llvm.fabs.f32(float %in)
   store float %fabs, float addrspace(1)* %out
   ret void
 }
 
 ; FUNC-LABEL: {{^}}fabs_v2f32:
 ; R600: |{{(PV|T[0-9])\.[XYZW]}}|
 ; R600: |{{(PV|T[0-9])\.[XYZW]}}|

test/CodeGen/AMDGPU/fneg-fabs.f16.ll

define amdgpu_kernel void @fold_user_fneg_fabs_v2f16(<2 x half> addrspace(1)* %out, <2 x half> %in) #0 {
   %fneg.fabs = fsub <2 x half> <half -0.0, half -0.0>, %fabs
   %mul = fmul <2 x half> %fneg.fabs, <half 4.0, half 4.0>
   store <2 x half> %mul, <2 x half> addrspace(1)* %out
   ret void
 }
 
 ; GCN-LABEL: {{^}}s_fneg_multi_use_fabs_v2f16:
 ; GFX9: s_and_b32 [[ABS:s[0-9]+]], s{{[0-9]+}}, 0x7fff7fff
-; GFX9: v_mov_b32_e32 [[VABS:v[0-9]+]], [[ABS]]
-; GFX9: v_xor_b32_e32 [[NEG:v[0-9]+]], 0x80008000, [[VABS]]
+; GFX9: v_mov_b32_e32 [[V_ABS:v[0-9]+]], [[ABS]]
+; GFX9: s_xor_b32 [[NEG:s[0-9]+]], 0x80008000, [[ABS]]
+; GFX9-DAG: v_mov_b32_e32 [[V_NEG:v[0-9]+]], [[NEG]]
+; GFX9-DAG: global_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[V_ABS]]
+; GFX9: global_store_dword v{{\[[0-9]+:[0-9]+\]}}, [[V_NEG]]
 define amdgpu_kernel void @s_fneg_multi_use_fabs_v2f16(<2 x half> addrspace(1)* %out0, <2 x half> addrspace(1)* %out1, <2 x half> %in) {
   %fabs = call <2 x half> @llvm.fabs.v2f16(<2 x half> %in)
   %fneg = fsub <2 x half> <half -0.0, half -0.0>, %fabs
   store <2 x half> %fabs, <2 x half> addrspace(1)* %out0
   store <2 x half> %fneg, <2 x half> addrspace(1)* %out1
   ret void
 }
 

test/CodeGen/AMDGPU/fneg.f16.ll

define amdgpu_kernel void @v_fneg_f16(half addrspace(1)* %out, half addrspace(1)* %in) #0 {
   %val = load half, half addrspace(1)* %gep.in, align 2
   %fneg = fsub half -0.0, %val
   store half %fneg, half addrspace(1)* %gep.out
   ret void
 }
 
 ; GCN-LABEL: {{^}}s_fneg_free_f16:
 ; GCN: s_load_dword [[NEG_VALUE:s[0-9]+]],
-
-; CI: s_xor_b32 [[XOR:s[0-9]+]], [[NEG_VALUE]], 0x8000{{$}}
-; CI: v_mov_b32_e32 [[V_XOR:v[0-9]+]], [[XOR]]
-; CI: flat_store_short v{{\[[0-9]+:[0-9]+\]}}, [[V_XOR]]
-
-; GFX89: v_mov_b32_e32 [[MASK:v[0-9]+]], 0x8000
-; GFX89: v_xor_b32_e32 [[XOR:v[0-9]+]], [[NEG_VALUE]], [[MASK]]
-; GFX89: {{flat|global}}_store_short v{{\[[0-9]+:[0-9]+\]}}, [[XOR]]
+; GCN: s_xor_b32 [[XOR:s[0-9]+]], [[NEG_VALUE]], 0x8000{{$}}
+; GCN: v_mov_b32_e32 [[V_XOR:v[0-9]+]], [[XOR]]
+; GCN: {{flat|global}}_store_short v{{\[[0-9]+:[0-9]+\]}}, [[V_XOR]]
 define amdgpu_kernel void @s_fneg_free_f16(half addrspace(1)* %out, i16 %in) #0 {
   %bc = bitcast i16 %in to half
   %fsub = fsub half -0.0, %bc
   store half %fsub, half addrspace(1)* %out
   ret void
 }
 
 ; GCN-LABEL: {{^}}v_fneg_fold_f16:

 define amdgpu_kernel void @v_fneg_fold_f16(half addrspace(1)* %out, half addrspace(1)* %in) #0 {
   %val = load half, half addrspace(1)* %in
   %fsub = fsub half -0.0, %val
   %fmul = fmul half %fsub, %val
   store half %fmul, half addrspace(1)* %out
   ret void
 }
 
-; FIXME: scalar for VI, vector for gfx9
+; FIXME: random commute
 ; GCN-LABEL: {{^}}s_fneg_v2f16:
 ; CIVI: s_xor_b32 s{{[0-9]+}}, s{{[0-9]+}}, 0x80008000
-; GFX9: v_xor_b32_e32 v{{[0-9]+}}, 0x80008000, v{{[0-9]+}}
+; GFX9: s_xor_b32 s{{[0-9]+}}, 0x80008000, s{{[0-9]+}}
 define amdgpu_kernel void @s_fneg_v2f16(<2 x half> addrspace(1)* %out, <2 x half> %in) #0 {
   %fneg = fsub <2 x half> <half -0.0, half -0.0>, %in
   store <2 x half> %fneg, <2 x half> addrspace(1)* %out
   ret void
 }
 
-; FIXME: vector on gfx9
 ; GCN-LABEL: {{^}}s_fneg_v2f16_nonload:
 ; CIVI: s_xor_b32 s{{[0-9]+}}, s{{[0-9]+}}, 0x80008000
-; GFX9: v_xor_b32_e32 v{{[0-9]+}}, 0x80008000, v{{[0-9]+}}
+; GFX9: s_xor_b32 s{{[0-9]+}}, 0x80008000, s{{[0-9]+}}
 define amdgpu_kernel void @s_fneg_v2f16_nonload(<2 x half> addrspace(1)* %out) #0 {
   %in = call i32 asm sideeffect "; def $0", "=s"()
   %in.bc = bitcast i32 %in to <2 x half>
   %fneg = fsub <2 x half> <half -0.0, half -0.0>, %in.bc
   store <2 x half> %fneg, <2 x half> addrspace(1)* %out
   ret void
 }
 
 ; GCN-LABEL: {{^}}v_fneg_v2f16:
 ; GCN: {{flat|global}}_load_dword [[VAL:v[0-9]+]]
 ; GCN: v_xor_b32_e32 v{{[0-9]+}}, 0x80008000, [[VAL]]
 define amdgpu_kernel void @v_fneg_v2f16(<2 x half> addrspace(1)* %out, <2 x half> addrspace(1)* %in) #0 {
   %tid = call i32 @llvm.amdgcn.workitem.id.x()
   %gep.in = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %in, i32 %tid
   %gep.out = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %in, i32 %tid
   %val = load <2 x half>, <2 x half> addrspace(1)* %gep.in, align 2
   %fneg = fsub <2 x half> <half -0.0, half -0.0>, %val
   store <2 x half> %fneg, <2 x half> addrspace(1)* %gep.out
   ret void
 }
 
 ; GCN-LABEL: {{^}}fneg_free_v2f16:
 ; GCN: s_load_dword [[VAL:s[0-9]+]]
 ; CIVI: s_xor_b32 s{{[0-9]+}}, [[VAL]], 0x80008000
-
-; GFX9: v_mov_b32_e32 [[VVAL:v[0-9]+]], [[VAL]]
-; GFX9: v_xor_b32_e32 v{{[0-9]+}}, 0x80008000, [[VVAL]]
+; GFX9: s_xor_b32 s{{[0-9]+}}, 0x80008000, [[VAL]]
 define amdgpu_kernel void @fneg_free_v2f16(<2 x half> addrspace(1)* %out, i32 %in) #0 {
   %bc = bitcast i32 %in to <2 x half>
   %fsub = fsub <2 x half> <half -0.0, half -0.0>, %bc
   store <2 x half> %fsub, <2 x half> addrspace(1)* %out
   ret void
 }
 
 ; GCN-LABEL: {{^}}v_fneg_fold_v2f16: