RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-04-15 14:09:57 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[SelectionDAG] Add SelectionDAG.computeKnownBits test support for ISD::ABS

Browse Source 
llvm-svn: 298108
This commit is contained in:
Simon Pilgrim 2017-03-17 17:45:36 +00:00
parent 8ed4f814f5
commit 52d0e4b51c
2 changed files with 22 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -2730,6 +2730,26 @@ void SelectionDAG::computeKnownBits(SDValue Op, APInt &KnownZero,
KnownOne = KnownOne2.byteSwap();
break;
}
case ISD::ABS: {
computeKnownBits(Op.getOperand(0), KnownZero2, KnownOne2, DemandedElts,
Depth + 1);
// If the source's MSB is zero then we know the rest of the bits already.
if (KnownZero2[BitWidth - 1]) {
KnownZero = KnownZero2;
KnownOne = KnownOne2;
break;
}
// We only know that the absolute values's MSB will be zero iff there is
// a set bit that isn't the sign bit (otherwise it could be INT_MIN).
KnownOne2.clearBit(BitWidth - 1);
if (KnownOne2.getBoolValue()) {
KnownZero = APInt::getSignBit(BitWidth);
break;
}
break;
}
case ISD::UMIN: {
computeKnownBits(Op.getOperand(0), KnownZero, KnownOne, DemandedElts,
Depth + 1);

12
test/CodeGen/X86/known-bits-vector.ll
View File

@ -590,11 +590,7 @@ define <4 x float> @knownbits_or_abs_uitofp(<4 x i32> %a0) {
; X32-NEXT: vpor {{\.LCPI.*}}, %xmm0, %xmm0
; X32-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,2,0,2]
; X32-NEXT: vpabsd %xmm0, %xmm0
; X32-NEXT: vpblendw {{.*#+}} xmm1 = xmm0[0],mem[1],xmm0[2],mem[3],xmm0[4],mem[5],xmm0[6],mem[7]
; X32-NEXT: vpsrld $16, %xmm0, %xmm0
; X32-NEXT: vpblendw {{.*#+}} xmm0 = xmm0[0],mem[1],xmm0[2],mem[3],xmm0[4],mem[5],xmm0[6],mem[7]
; X32-NEXT: vaddps {{\.LCPI.*}}, %xmm0, %xmm0
; X32-NEXT: vaddps %xmm0, %xmm1, %xmm0
; X32-NEXT: vcvtdq2ps %xmm0, %xmm0
; X32-NEXT: retl
;
; X64-LABEL: knownbits_or_abs_uitofp:
@ -602,11 +598,7 @@ define <4 x float> @knownbits_or_abs_uitofp(<4 x i32> %a0) {
; X64-NEXT: vpor {{.*}}(%rip), %xmm0, %xmm0
; X64-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[0,2,0,2]
; X64-NEXT: vpabsd %xmm0, %xmm0
; X64-NEXT: vpblendw {{.*#+}} xmm1 = xmm0[0],mem[1],xmm0[2],mem[3],xmm0[4],mem[5],xmm0[6],mem[7]
; X64-NEXT: vpsrld $16, %xmm0, %xmm0
; X64-NEXT: vpblendw {{.*#+}} xmm0 = xmm0[0],mem[1],xmm0[2],mem[3],xmm0[4],mem[5],xmm0[6],mem[7]
; X64-NEXT: vaddps {{.*}}(%rip), %xmm0, %xmm0
; X64-NEXT: vaddps %xmm0, %xmm1, %xmm0
; X64-NEXT: vcvtdq2ps %xmm0, %xmm0
; X64-NEXT: retq
%1 = or <4 x i32> %a0, <i32 1, i32 0, i32 3, i32 0>
%2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 0, i32 2, i32 0, i32 2>