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b1686d7a9c
If the truncate is only accessing the first element of the vector, we can use the original source value. This helps with some combine ordering issues after operations are lowered to integer operations between bitcasts of build_vector. In particular it stops unnecessarily materializing the unused top half of a vector in some cases. llvm-svn: 331909
56 lines
1.8 KiB
LLVM
56 lines
1.8 KiB
LLVM
; RUN: llc -march=amdgcn -mcpu=fiji -verify-machineinstrs< %s | FileCheck -enable-var-scope -check-prefixes=GCN,VI %s
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; Make sure high constant 0 isn't pointlessly materialized
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; GCN-LABEL: {{^}}trunc_bitcast_i64_lshr_32_i16:
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; GCN: s_waitcnt
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; GCN-NEXT: v_mov_b32_e32 v0, v1
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; GCN-NEXT: s_setpc_b64
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define i16 @trunc_bitcast_i64_lshr_32_i16(i64 %bar) {
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%srl = lshr i64 %bar, 32
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%trunc = trunc i64 %srl to i16
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ret i16 %trunc
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}
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; GCN-LABEL: {{^}}trunc_bitcast_i64_lshr_32_i32:
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; GCN: s_waitcnt
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; GCN-NEXT: v_mov_b32_e32 v0, v1
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; GCN-NEXT: s_setpc_b64
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define i32 @trunc_bitcast_i64_lshr_32_i32(i64 %bar) {
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%srl = lshr i64 %bar, 32
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%trunc = trunc i64 %srl to i32
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ret i32 %trunc
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}
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; GCN-LABEL: {{^}}trunc_bitcast_v2i32_to_i16:
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; GCN: _load_dword
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; GCN-NOT: _load_dword
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; GCN-NOT: v_mov_b32
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; GCN: v_add_u32_e32 v0, vcc, 4, v0
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define i16 @trunc_bitcast_v2i32_to_i16(<2 x i32> %bar) {
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%load0 = load i32, i32 addrspace(1)* undef
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%load1 = load i32, i32 addrspace(1)* null
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%insert.0 = insertelement <2 x i32> undef, i32 %load0, i32 0
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%insert.1 = insertelement <2 x i32> %insert.0, i32 99, i32 1
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%bc = bitcast <2 x i32> %insert.1 to i64
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%trunc = trunc i64 %bc to i16
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%add = add i16 %trunc, 4
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ret i16 %add
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}
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; Make sure there's no crash if the source vector type is FP
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; GCN-LABEL: {{^}}trunc_bitcast_v2f32_to_i16:
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; GCN: _load_dword
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; GCN-NOT: _load_dword
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; GCN-NOT: v_mov_b32
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; GCN: v_add_u32_e32 v0, vcc, 4, v0
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define i16 @trunc_bitcast_v2f32_to_i16(<2 x float> %bar) {
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%load0 = load float, float addrspace(1)* undef
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%load1 = load float, float addrspace(1)* null
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%insert.0 = insertelement <2 x float> undef, float %load0, i32 0
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%insert.1 = insertelement <2 x float> %insert.0, float 4.0, i32 1
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%bc = bitcast <2 x float> %insert.1 to i64
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%trunc = trunc i64 %bc to i16
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%add = add i16 %trunc, 4
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ret i16 %add
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}
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