[llvm] r291777 - AMDGPU: Fold fneg into fp_extend
Matt Arsenault via llvm-commits
llvm-commits at lists.llvm.org
Thu Jan 12 09:46:28 PST 2017
Author: arsenm
Date: Thu Jan 12 11:46:28 2017
New Revision: 291777
URL: http://llvm.org/viewvc/llvm-project?rev=291777&view=rev
Log:
AMDGPU: Fold fneg into fp_extend
Modified:
llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
llvm/trunk/test/CodeGen/AMDGPU/fneg-combines.ll
Modified: llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp?rev=291777&r1=291776&r2=291777&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp Thu Jan 12 11:46:28 2017
@@ -2899,6 +2899,20 @@ SDValue AMDGPUTargetLowering::performFNe
DAG.ReplaceAllUsesWith(N0, DAG.getNode(ISD::FNEG, SL, VT, Res));
return Res;
}
+ case ISD::FP_EXTEND: {
+ SDValue CvtSrc = N0.getOperand(0);
+ if (CvtSrc.getOpcode() == ISD::FNEG) {
+ // (fneg (fp_extend (fneg x))) -> (fp_extend x)
+ return DAG.getNode(ISD::FP_EXTEND, SL, VT, CvtSrc.getOperand(0));
+ }
+
+ if (!N0.hasOneUse())
+ return SDValue();
+
+ // (fneg (fp_extend x)) -> (fp_extend (fneg x))
+ SDValue Neg = DAG.getNode(ISD::FNEG, SL, CvtSrc.getValueType(), CvtSrc);
+ return DAG.getNode(ISD::FP_EXTEND, SL, VT, Neg);
+ }
default:
return SDValue();
}
Modified: llvm/trunk/test/CodeGen/AMDGPU/fneg-combines.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AMDGPU/fneg-combines.ll?rev=291777&r1=291776&r2=291777&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AMDGPU/fneg-combines.ll (original)
+++ llvm/trunk/test/CodeGen/AMDGPU/fneg-combines.ll Thu Jan 12 11:46:28 2017
@@ -655,6 +655,132 @@ define void @v_fneg_fmad_multi_use_fmad_
ret void
}
+; --------------------------------------------------------------------------------
+; fp_extend tests
+; --------------------------------------------------------------------------------
+
+; GCN-LABEL: {{^}}v_fneg_fp_extend_f32_to_f64:
+; GCN: {{buffer|flat}}_load_dword [[A:v[0-9]+]]
+; GCN: v_cvt_f64_f32_e64 [[RESULT:v\[[0-9]+:[0-9]+\]]], -[[A]]
+; GCN: buffer_store_dwordx2 [[RESULT]]
+define void @v_fneg_fp_extend_f32_to_f64(double addrspace(1)* %out, float addrspace(1)* %a.ptr) #0 {
+ %tid = call i32 @llvm.amdgcn.workitem.id.x()
+ %tid.ext = sext i32 %tid to i64
+ %a.gep = getelementptr inbounds float, float addrspace(1)* %a.ptr, i64 %tid.ext
+ %out.gep = getelementptr inbounds double, double addrspace(1)* %out, i64 %tid.ext
+ %a = load volatile float, float addrspace(1)* %a.gep
+ %fpext = fpext float %a to double
+ %fneg = fsub double -0.000000e+00, %fpext
+ store double %fneg, double addrspace(1)* %out.gep
+ ret void
+}
+
+; GCN-LABEL: {{^}}v_fneg_fp_extend_fneg_f32_to_f64:
+; GCN: {{buffer|flat}}_load_dword [[A:v[0-9]+]]
+; GCN: v_cvt_f64_f32_e32 [[RESULT:v\[[0-9]+:[0-9]+\]]], [[A]]
+; GCN: buffer_store_dwordx2 [[RESULT]]
+define void @v_fneg_fp_extend_fneg_f32_to_f64(double addrspace(1)* %out, float addrspace(1)* %a.ptr) #0 {
+ %tid = call i32 @llvm.amdgcn.workitem.id.x()
+ %tid.ext = sext i32 %tid to i64
+ %a.gep = getelementptr inbounds float, float addrspace(1)* %a.ptr, i64 %tid.ext
+ %out.gep = getelementptr inbounds double, double addrspace(1)* %out, i64 %tid.ext
+ %a = load volatile float, float addrspace(1)* %a.gep
+ %fneg.a = fsub float -0.000000e+00, %a
+ %fpext = fpext float %fneg.a to double
+ %fneg = fsub double -0.000000e+00, %fpext
+ store double %fneg, double addrspace(1)* %out.gep
+ ret void
+}
+
+; GCN-LABEL: {{^}}v_fneg_fp_extend_store_use_fneg_f32_to_f64:
+; GCN: {{buffer|flat}}_load_dword [[A:v[0-9]+]]
+; GCN-DAG: v_cvt_f64_f32_e32 [[RESULT:v\[[0-9]+:[0-9]+\]]], [[A]]
+; GCN-DAG: v_xor_b32_e32 [[FNEG_A:v[0-9]+]], 0x80000000, [[A]]
+; GCN: buffer_store_dwordx2 [[RESULT]]
+; GCN: buffer_store_dword [[FNEG_A]]
+define void @v_fneg_fp_extend_store_use_fneg_f32_to_f64(double addrspace(1)* %out, float addrspace(1)* %a.ptr) #0 {
+ %tid = call i32 @llvm.amdgcn.workitem.id.x()
+ %tid.ext = sext i32 %tid to i64
+ %a.gep = getelementptr inbounds float, float addrspace(1)* %a.ptr, i64 %tid.ext
+ %out.gep = getelementptr inbounds double, double addrspace(1)* %out, i64 %tid.ext
+ %a = load volatile float, float addrspace(1)* %a.gep
+ %fneg.a = fsub float -0.000000e+00, %a
+ %fpext = fpext float %fneg.a to double
+ %fneg = fsub double -0.000000e+00, %fpext
+ store volatile double %fneg, double addrspace(1)* %out.gep
+ store volatile float %fneg.a, float addrspace(1)* undef
+ ret void
+}
+
+; GCN-LABEL: {{^}}v_fneg_multi_use_fp_extend_fneg_f32_to_f64:
+; GCN: {{buffer|flat}}_load_dword [[A:v[0-9]+]]
+; GCN-DAG: v_cvt_f64_f32_e32 v{{\[}}[[CVT_LO:[0-9]+]]:[[CVT_HI:[0-9]+]]{{\]}}, [[A]]
+; GCN-DAG: v_xor_b32_e32 v[[FNEG_A:[0-9]+]], 0x80000000, v[[CVT_HI]]
+; GCN: buffer_store_dwordx2 v{{\[[0-9]+}}:[[FNEG_A]]{{\]}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[CVT_LO]]:[[CVT_HI]]{{\]}}
+define void @v_fneg_multi_use_fp_extend_fneg_f32_to_f64(double addrspace(1)* %out, float addrspace(1)* %a.ptr) #0 {
+ %tid = call i32 @llvm.amdgcn.workitem.id.x()
+ %tid.ext = sext i32 %tid to i64
+ %a.gep = getelementptr inbounds float, float addrspace(1)* %a.ptr, i64 %tid.ext
+ %out.gep = getelementptr inbounds double, double addrspace(1)* %out, i64 %tid.ext
+ %a = load volatile float, float addrspace(1)* %a.gep
+ %fpext = fpext float %a to double
+ %fneg = fsub double -0.000000e+00, %fpext
+ store volatile double %fneg, double addrspace(1)* %out.gep
+ store volatile double %fpext, double addrspace(1)* undef
+ ret void
+}
+
+; GCN-LABEL: {{^}}v_fneg_multi_foldable_use_fp_extend_fneg_f32_to_f64:
+; GCN: {{buffer|flat}}_load_dword [[A:v[0-9]+]]
+; GCN-DAG: v_cvt_f64_f32_e32 v{{\[}}[[CVT_LO:[0-9]+]]:[[CVT_HI:[0-9]+]]{{\]}}, [[A]]
+; GCN-DAG: v_xor_b32_e32 v[[FNEG_A:[0-9]+]], 0x80000000, v[[CVT_HI]]
+; GCN-DAG: v_mul_f64 [[MUL:v\[[0-9]+:[0-9]+\]]], v{{\[}}[[CVT_LO]]:[[CVT_HI]]{{\]}}, 4.0
+; GCN: buffer_store_dwordx2 v{{\[[0-9]+}}:[[FNEG_A]]{{\]}}
+; GCN: buffer_store_dwordx2 [[MUL]]
+define void @v_fneg_multi_foldable_use_fp_extend_fneg_f32_to_f64(double addrspace(1)* %out, float addrspace(1)* %a.ptr) #0 {
+ %tid = call i32 @llvm.amdgcn.workitem.id.x()
+ %tid.ext = sext i32 %tid to i64
+ %a.gep = getelementptr inbounds float, float addrspace(1)* %a.ptr, i64 %tid.ext
+ %out.gep = getelementptr inbounds double, double addrspace(1)* %out, i64 %tid.ext
+ %a = load volatile float, float addrspace(1)* %a.gep
+ %fpext = fpext float %a to double
+ %fneg = fsub double -0.000000e+00, %fpext
+ %mul = fmul double %fpext, 4.0
+ store volatile double %fneg, double addrspace(1)* %out.gep
+ store volatile double %mul, double addrspace(1)* %out.gep
+ ret void
+}
+
+; FIXME: Source modifiers not folded for f16->f32
+; GCN-LABEL: {{^}}v_fneg_multi_use_fp_extend_fneg_f16_to_f32:
+define void @v_fneg_multi_use_fp_extend_fneg_f16_to_f32(float addrspace(1)* %out, half addrspace(1)* %a.ptr) #0 {
+ %tid = call i32 @llvm.amdgcn.workitem.id.x()
+ %tid.ext = sext i32 %tid to i64
+ %a.gep = getelementptr inbounds half, half addrspace(1)* %a.ptr, i64 %tid.ext
+ %out.gep = getelementptr inbounds float, float addrspace(1)* %out, i64 %tid.ext
+ %a = load volatile half, half addrspace(1)* %a.gep
+ %fpext = fpext half %a to float
+ %fneg = fsub float -0.000000e+00, %fpext
+ store volatile float %fneg, float addrspace(1)* %out.gep
+ store volatile float %fpext, float addrspace(1)* %out.gep
+ ret void
+}
+
+; GCN-LABEL: {{^}}v_fneg_multi_foldable_use_fp_extend_fneg_f16_to_f32:
+define void @v_fneg_multi_foldable_use_fp_extend_fneg_f16_to_f32(float addrspace(1)* %out, half addrspace(1)* %a.ptr) #0 {
+ %tid = call i32 @llvm.amdgcn.workitem.id.x()
+ %tid.ext = sext i32 %tid to i64
+ %a.gep = getelementptr inbounds half, half addrspace(1)* %a.ptr, i64 %tid.ext
+ %out.gep = getelementptr inbounds float, float addrspace(1)* %out, i64 %tid.ext
+ %a = load volatile half, half addrspace(1)* %a.gep
+ %fpext = fpext half %a to float
+ %fneg = fsub float -0.000000e+00, %fpext
+ %mul = fmul float %fpext, 4.0
+ store volatile float %fneg, float addrspace(1)* %out.gep
+ store volatile float %mul, float addrspace(1)* %out.gep
+ ret void
+}
declare i32 @llvm.amdgcn.workitem.id.x() #1
declare float @llvm.fma.f32(float, float, float) #1
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