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[ValueTracking] Compute known bits of min/max intrinsics
Implement known bits for the min/max intrinsics based on the recently added KnownBits primitives.
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@ -1739,6 +1739,26 @@ static void computeKnownBitsFromOperator(const Operator *I,
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}
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break;
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}
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case Intrinsic::umin:
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computeKnownBits(I->getOperand(0), Known, Depth + 1, Q);
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computeKnownBits(I->getOperand(1), Known2, Depth + 1, Q);
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Known = KnownBits::umin(Known, Known2);
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break;
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case Intrinsic::umax:
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computeKnownBits(I->getOperand(0), Known, Depth + 1, Q);
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computeKnownBits(I->getOperand(1), Known2, Depth + 1, Q);
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Known = KnownBits::umax(Known, Known2);
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break;
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case Intrinsic::smin:
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computeKnownBits(I->getOperand(0), Known, Depth + 1, Q);
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computeKnownBits(I->getOperand(1), Known2, Depth + 1, Q);
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Known = KnownBits::smin(Known, Known2);
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break;
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case Intrinsic::smax:
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computeKnownBits(I->getOperand(0), Known, Depth + 1, Q);
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computeKnownBits(I->getOperand(1), Known2, Depth + 1, Q);
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Known = KnownBits::smax(Known, Known2);
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break;
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case Intrinsic::x86_sse42_crc32_64_64:
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Known.Zero.setBitsFrom(32);
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break;
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@ -8,10 +8,7 @@ declare i8 @llvm.smax.i8(i8, i8)
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define i8 @umin_known_bits(i8 %x, i8 %y) {
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; CHECK-LABEL: @umin_known_bits(
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; CHECK-NEXT: [[X2:%.*]] = and i8 [[X:%.*]], 127
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; CHECK-NEXT: [[M:%.*]] = call i8 @llvm.umin.i8(i8 [[X2]], i8 [[Y:%.*]])
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; CHECK-NEXT: [[R:%.*]] = and i8 [[M]], -128
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; CHECK-NEXT: ret i8 [[R]]
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; CHECK-NEXT: ret i8 0
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;
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%x2 = and i8 %x, 127
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%m = call i8 @llvm.umin.i8(i8 %x2, i8 %y)
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@ -21,10 +18,7 @@ define i8 @umin_known_bits(i8 %x, i8 %y) {
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define i8 @umax_known_bits(i8 %x, i8 %y) {
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; CHECK-LABEL: @umax_known_bits(
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; CHECK-NEXT: [[X2:%.*]] = or i8 [[X:%.*]], -128
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; CHECK-NEXT: [[M:%.*]] = call i8 @llvm.umax.i8(i8 [[X2]], i8 [[Y:%.*]])
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; CHECK-NEXT: [[R:%.*]] = and i8 [[M]], -128
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; CHECK-NEXT: ret i8 [[R]]
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; CHECK-NEXT: ret i8 -128
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;
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%x2 = or i8 %x, -128
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%m = call i8 @llvm.umax.i8(i8 %x2, i8 %y)
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@ -34,10 +28,7 @@ define i8 @umax_known_bits(i8 %x, i8 %y) {
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define i8 @smin_known_bits(i8 %x, i8 %y) {
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; CHECK-LABEL: @smin_known_bits(
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; CHECK-NEXT: [[X2:%.*]] = or i8 [[X:%.*]], -128
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; CHECK-NEXT: [[M:%.*]] = call i8 @llvm.smin.i8(i8 [[X2]], i8 [[Y:%.*]])
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; CHECK-NEXT: [[R:%.*]] = and i8 [[M]], -128
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; CHECK-NEXT: ret i8 [[R]]
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; CHECK-NEXT: ret i8 -128
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;
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%x2 = or i8 %x, -128
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%m = call i8 @llvm.smin.i8(i8 %x2, i8 %y)
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@ -47,10 +38,7 @@ define i8 @smin_known_bits(i8 %x, i8 %y) {
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define i8 @smax_known_bits(i8 %x, i8 %y) {
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; CHECK-LABEL: @smax_known_bits(
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; CHECK-NEXT: [[X2:%.*]] = and i8 [[X:%.*]], 127
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; CHECK-NEXT: [[M:%.*]] = call i8 @llvm.smax.i8(i8 [[X2]], i8 [[Y:%.*]])
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; CHECK-NEXT: [[R:%.*]] = and i8 [[M]], -128
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; CHECK-NEXT: ret i8 [[R]]
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; CHECK-NEXT: ret i8 0
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;
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%x2 = and i8 %x, 127
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%m = call i8 @llvm.smax.i8(i8 %x2, i8 %y)
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