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[X86][XOP] Update isVectorShiftByScalarCheap with cases covered by XOP 

Similar to D42437, XOP supports variable shift for v16i8/v8i16/v4i32/v2i64 types.

Differential Revision: https://reviews.llvm.org/D42526

llvm-svn: 323797
This commit is contained in:
Simon Pilgrim 2018-01-30 18:10:21 +00:00
parent a9f488588d
commit 073f089c6e
2 changed files with 8 additions and 6 deletions
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5
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -25593,6 +25593,11 @@ bool X86TargetLowering::isVectorShiftByScalarCheap(Type *Ty) const {
if (Bits == 8)
return false;
// XOP has v16i8/v8i16/v4i32/v2i64 variable vector shifts.
if (Subtarget.hasXOP() && Ty->getPrimitiveSizeInBits() == 128 &&
(Bits == 8 || Bits == 16 || Bits == 32 || Bits == 64))
return false;
// AVX2 has vpsllv[dq] instructions (and other shifts) that make variable
// shifts just as cheap as scalar ones.
if (Subtarget.hasAVX2() && (Bits == 32 || Bits == 64))

9
llvm/test/Transforms/CodeGenPrepare/X86/x86-shuffle-sink.ll
View File

@ -45,8 +45,7 @@ define <8 x i16> @test_16bit(<8 x i16> %lhs, <8 x i16> %tmp, i1 %tst) {
; CHECK-XOP: if_true:
; CHECK-XOP-NEXT: ret <8 x i16> [[MASK]]
; CHECK-XOP: if_false:
; CHECK-XOP-NEXT: [[TMP1:%.*]] = shufflevector <8 x i16> [[TMP]], <8 x i16> undef, <8 x i32> zeroinitializer
; CHECK-XOP-NEXT: [[RES:%.*]] = shl <8 x i16> [[LHS:%.*]], [[TMP1]]
; CHECK-XOP-NEXT: [[RES:%.*]] = shl <8 x i16> [[LHS:%.*]], [[MASK]]
; CHECK-XOP-NEXT: ret <8 x i16> [[RES]]
;
; CHECK-AVX2-LABEL: @test_16bit(
@ -117,8 +116,7 @@ define <4 x i32> @test_32bit(<4 x i32> %lhs, <4 x i32> %tmp, i1 %tst) {
; CHECK-XOP: if_true:
; CHECK-XOP-NEXT: ret <4 x i32> [[MASK]]
; CHECK-XOP: if_false:
; CHECK-XOP-NEXT: [[TMP1:%.*]] = shufflevector <4 x i32> [[TMP]], <4 x i32> undef, <4 x i32> <i32 0, i32 undef, i32 0, i32 0>
; CHECK-XOP-NEXT: [[RES:%.*]] = ashr <4 x i32> [[LHS:%.*]], [[TMP1]]
; CHECK-XOP-NEXT: [[RES:%.*]] = ashr <4 x i32> [[LHS:%.*]], [[MASK]]
; CHECK-XOP-NEXT: ret <4 x i32> [[RES]]
;
; CHECK-AVX-LABEL: @test_32bit(
@ -158,8 +156,7 @@ define <2 x i64> @test_64bit(<2 x i64> %lhs, <2 x i64> %tmp, i1 %tst) {
; CHECK-XOP: if_true:
; CHECK-XOP-NEXT: ret <2 x i64> [[MASK]]
; CHECK-XOP: if_false:
; CHECK-XOP-NEXT: [[TMP1:%.*]] = shufflevector <2 x i64> [[TMP]], <2 x i64> undef, <2 x i32> zeroinitializer
; CHECK-XOP-NEXT: [[RES:%.*]] = lshr <2 x i64> [[LHS:%.*]], [[TMP1]]
; CHECK-XOP-NEXT: [[RES:%.*]] = lshr <2 x i64> [[LHS:%.*]], [[MASK]]
; CHECK-XOP-NEXT: ret <2 x i64> [[RES]]
;
; CHECK-AVX-LABEL: @test_64bit(