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[SystemZ] Fix RNSBG bug introduced by r197802

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The zext handling added in r197802 wasn't right for RNSBG.  This patch
restricts it to ROSBG, RXSBG and RISBG.  (The tests for RISBG were added
in r197802 since RISBG was the motivating example.)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198862 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford 2014-01-09 11:28:53 +00:00
parent acb31a245c
commit db5c1f3d76
4 changed files with 43 additions and 8 deletions
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18
lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
View File

@ -769,15 +769,17 @@ bool SystemZDAGToDAGISel::expandRxSBG(RxSBGOperands &RxSBG) const {
RxSBG.Input = N.getOperand(0);
return true;
case ISD::ZERO_EXTEND: {
// Restrict the mask to the extended operand.
unsigned InnerBitSize = N.getOperand(0).getValueType().getSizeInBits();
if (!refineRxSBGMask(RxSBG, allOnes(InnerBitSize)))
return false;
case ISD::ZERO_EXTEND:
if (RxSBG.Opcode != SystemZ::RNSBG) {
// Restrict the mask to the extended operand.
unsigned InnerBitSize = N.getOperand(0).getValueType().getSizeInBits();
if (!refineRxSBGMask(RxSBG, allOnes(InnerBitSize)))
return false;
RxSBG.Input = N.getOperand(0);
return true;
}
RxSBG.Input = N.getOperand(0);
return true;
}
// Fall through.
case ISD::SIGN_EXTEND: {
// Check that the extension bits are don't-care (i.e. are masked out

11
test/CodeGen/SystemZ/rnsbg-01.ll
View File

@ -255,3 +255,14 @@ define i64 @f22(i64 %a, i64 %b) {
%and = and i64 %a, %rotlorb
ret i64 %and
}
; Check the handling of zext and AND, which isn't suitable for RNSBG.
define i64 @f23(i64 %a, i32 %b) {
; CHECK-LABEL: f23:
; CHECK-NOT: rnsbg
; CHECK: br %r14
%add = add i32 %b, 1
%ext = zext i32 %add to i64
%and = and i64 %a, %ext
ret i64 %and
}

11
test/CodeGen/SystemZ/rosbg-01.ll
View File

@ -108,3 +108,14 @@ define i64 @f11(i64 %a, i64 %b) {
%or = or i64 %a, %andb
ret i64 %or
}
; Check the handling of zext and OR, which can use ROSBG.
define i64 @f12(i64 %a, i32 %b) {
; CHECK-LABEL: f12:
; CHECK: rosbg %r2, %r3, 32, 63, 0
; CHECK: br %r14
%add = add i32 %b, 1
%ext = zext i32 %add to i64
%or = or i64 %a, %ext
ret i64 %or
}

11
test/CodeGen/SystemZ/rxsbg-01.ll
View File

@ -110,3 +110,14 @@ define i64 @f11(i64 %a, i64 %b) {
%xor = xor i64 %a, %andb
ret i64 %xor
}
; Check the handling of zext and XOR, which can use ROSBG.
define i64 @f12(i64 %a, i32 %b) {
; CHECK-LABEL: f12:
; CHECK: rxsbg %r2, %r3, 32, 63, 0
; CHECK: br %r14
%add = add i32 %b, 1
%ext = zext i32 %add to i64
%xor = xor i64 %a, %ext
ret i64 %xor
}