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Fixed crash of variable shift inst on AVX2 

https://llvm.org/bugs/show_bug.cgi?id=22955

llvm-svn: 235993
This commit is contained in:
Elena Demikhovsky 2015-04-28 14:46:35 +00:00
parent 0846f54b0e
commit 1f7b3644d3
2 changed files with 39 additions and 3 deletions
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4
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -16495,9 +16495,7 @@ static SDValue LowerScalarVariableShift(SDValue Op, SelectionDAG &DAG,
}
// Special case in 32-bit mode, where i64 is expanded into high and low parts.
if (!Subtarget->is64Bit() &&
(VT == MVT::v2i64 || (Subtarget->hasInt256() && VT == MVT::v4i64) ||
(Subtarget->hasAVX512() && VT == MVT::v8i64)) &&
if (!Subtarget->is64Bit() && VT == MVT::v2i64 &&
Amt.getOpcode() == ISD::BITCAST &&
Amt.getOperand(0).getOpcode() == ISD::BUILD_VECTOR) {
Amt = Amt.getOperand(0);

38
llvm/test/CodeGen/X86/shift-avx2-crash.ll Executable file
View File

@ -0,0 +1,38 @@
; RUN: llc < %s -mcpu=core-avx2 > /dev/null
; This test crashed on variable shift creation on AVX2
target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
target triple = "i386-unknown-linux-gnu"
define void @f_f(float* noalias nocapture %RET, float %aFOO, i32 %div) {
allocas:
%__idiv_table_u32_offset10_offset_load.i = add i64 0, -2
br label %if_then18.i
if_then18.i:
%aFOO_load_to_uint32 = fptoui float %aFOO to i32
%aFOO_load_to_uint32_broadcast_init = insertelement <8 x i32> undef, i32 %aFOO_load_to_uint32, i32 0
%aFOO_load_to_uint32_broadcast = shufflevector <8 x i32> %aFOO_load_to_uint32_broadcast_init, <8 x i32> undef, <8 x i32> zeroinitializer
%multiplier_load_broadcast_init.i = insertelement <8 x i64> undef, i64 2, i32 0
%multiplier_load_broadcast.i = shufflevector <8 x i64> %multiplier_load_broadcast_init.i, <8 x i64> undef, <8 x i32> zeroinitializer
%numerator_load_to_uint64.i = zext <8 x i32> %aFOO_load_to_uint32_broadcast to <8 x i64>
;if replace '%__idiv_table_u32_offset10_offset_load.i' with '-2' or remove 'if_then18.i' label the error disappears
%add__shift_load21.i = add i64 %__idiv_table_u32_offset10_offset_load.i, 32
%add__shift_load21_broadcast_init.i = insertelement <8 x i64> undef, i64 %add__shift_load21.i, i32 0
%add__shift_load21_broadcast.i = shufflevector <8 x i64> %add__shift_load21_broadcast_init.i, <8 x i64> undef, <8 x i32> zeroinitializer
%mul_val_load_mult_load.i = mul <8 x i64> %numerator_load_to_uint64.i, %multiplier_load_broadcast.i
%bitop22.i = lshr <8 x i64> %mul_val_load_mult_load.i, %add__shift_load21_broadcast.i
%bitop22_to_uint32.i = trunc <8 x i64> %bitop22.i to <8 x i32>
br label %__fast_idiv___UM_vyuunu.exit
__fast_idiv___UM_vyuunu.exit:
%calltmp_to_float = uitofp <8 x i32> %bitop22_to_uint32.i to <8 x float>
%ptrcast = bitcast float* %RET to <8 x float>*
store <8 x float> %calltmp_to_float, <8 x float>* %ptrcast, align 4
ret void
}