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[SystemZ] Make better use of VGEF/VGEG 

Current code in SystemZDAGToDAGISel::tryGather refuses to perform
any transformation if the Load SDNode has more than one use.  This
(erronously) counts uses of the chain result, which prevents the
optimization in many cases unnecessarily.  Fixed by this patch.

llvm-svn: 349748
This commit is contained in:
Ulrich Weigand 2018-12-20 13:01:20 +00:00
parent 36a3480385
commit 8bb46b0f01
2 changed files with 33 additions and 1 deletions
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2
llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
View File

@ -1147,7 +1147,7 @@ bool SystemZDAGToDAGISel::tryGather(SDNode *N, unsigned Opcode) {
return false;
auto *Load = dyn_cast<LoadSDNode>(N->getOperand(1));
if (!Load || !Load->hasOneUse())
if (!Load || !Load->hasNUsesOfValue(1, 0))
return false;
if (Load->getMemoryVT().getSizeInBits() !=
Load->getValueType(0).getSizeInBits())

32
llvm/test/CodeGen/SystemZ/vec-move-08.ll
View File

@ -442,3 +442,35 @@ define <2 x double> @f39(<2 x double> %val, <2 x i64> %index, i64 %base) {
%ret = insertelement <2 x double> %val, double %element, i32 1
ret <2 x double> %ret
}
; Test a v4i32 gather where the load is chained.
define void @f40(<4 x i32> %val, <4 x i32> %index, i64 %base, <4 x i32> *%res) {
; CHECK-LABEL: f40:
; CHECK: vgef %v24, 0(%v26,%r2), 1
; CHECK: vst %v24, 0(%r3)
; CHECK: br %r14
%elem = extractelement <4 x i32> %index, i32 1
%ext = zext i32 %elem to i64
%add = add i64 %base, %ext
%ptr = inttoptr i64 %add to i32 *
%element = load i32, i32 *%ptr
%ret = insertelement <4 x i32> %val, i32 %element, i32 1
store <4 x i32> %ret, <4 x i32> *%res
ret void
}
; Test a v2i64 gather where the load is chained.
define void @f41(<2 x i64> %val, <2 x i64> %index, i64 %base, <2 x i64> *%res) {
; CHECK-LABEL: f41:
; CHECK: vgeg %v24, 0(%v26,%r2), 1
; CHECK: vst %v24, 0(%r3)
; CHECK: br %r14
%elem = extractelement <2 x i64> %index, i32 1
%add = add i64 %base, %elem
%ptr = inttoptr i64 %add to i64 *
%element = load i64, i64 *%ptr
%ret = insertelement <2 x i64> %val, i64 %element, i32 1
store <2 x i64> %ret, <2 x i64> *%res
ret void
}