[llvm] a852234 - [ConstantRange] Handle wrapping ranges in min/max (PR48643)
Nikita Popov via llvm-commits
llvm-commits at lists.llvm.org
Sat Feb 20 13:52:35 PST 2021
Author: Nikita Popov
Date: 2021-02-20T22:52:09+01:00
New Revision: a852234f70e344b238824b9d71e8df9c46de62f2
URL: https://github.com/llvm/llvm-project/commit/a852234f70e344b238824b9d71e8df9c46de62f2
DIFF: https://github.com/llvm/llvm-project/commit/a852234f70e344b238824b9d71e8df9c46de62f2.diff
LOG: [ConstantRange] Handle wrapping ranges in min/max (PR48643)
When one of the inputs is a wrapping range, intersect with the
union of the two inputs. The union of the two inputs corresponds
to the result we would get if we treated the min/max as a simple
select.
This fixes PR48643.
Added:
Modified:
llvm/lib/IR/ConstantRange.cpp
llvm/unittests/IR/ConstantRangeTest.cpp
Removed:
################################################################################
diff --git a/llvm/lib/IR/ConstantRange.cpp b/llvm/lib/IR/ConstantRange.cpp
index 275996dd02d8..4dbe1a1b902d 100644
--- a/llvm/lib/IR/ConstantRange.cpp
+++ b/llvm/lib/IR/ConstantRange.cpp
@@ -1058,7 +1058,10 @@ ConstantRange::smax(const ConstantRange &Other) const {
return getEmpty();
APInt NewL = APIntOps::smax(getSignedMin(), Other.getSignedMin());
APInt NewU = APIntOps::smax(getSignedMax(), Other.getSignedMax()) + 1;
- return getNonEmpty(std::move(NewL), std::move(NewU));
+ ConstantRange Res = getNonEmpty(std::move(NewL), std::move(NewU));
+ if (isSignWrappedSet() || Other.isSignWrappedSet())
+ return Res.intersectWith(unionWith(Other, Signed), Signed);
+ return Res;
}
ConstantRange
@@ -1069,7 +1072,10 @@ ConstantRange::umax(const ConstantRange &Other) const {
return getEmpty();
APInt NewL = APIntOps::umax(getUnsignedMin(), Other.getUnsignedMin());
APInt NewU = APIntOps::umax(getUnsignedMax(), Other.getUnsignedMax()) + 1;
- return getNonEmpty(std::move(NewL), std::move(NewU));
+ ConstantRange Res = getNonEmpty(std::move(NewL), std::move(NewU));
+ if (isWrappedSet() || Other.isWrappedSet())
+ return Res.intersectWith(unionWith(Other, Unsigned), Unsigned);
+ return Res;
}
ConstantRange
@@ -1080,7 +1086,10 @@ ConstantRange::smin(const ConstantRange &Other) const {
return getEmpty();
APInt NewL = APIntOps::smin(getSignedMin(), Other.getSignedMin());
APInt NewU = APIntOps::smin(getSignedMax(), Other.getSignedMax()) + 1;
- return getNonEmpty(std::move(NewL), std::move(NewU));
+ ConstantRange Res = getNonEmpty(std::move(NewL), std::move(NewU));
+ if (isSignWrappedSet() || Other.isSignWrappedSet())
+ return Res.intersectWith(unionWith(Other, Signed), Signed);
+ return Res;
}
ConstantRange
@@ -1091,7 +1100,10 @@ ConstantRange::umin(const ConstantRange &Other) const {
return getEmpty();
APInt NewL = APIntOps::umin(getUnsignedMin(), Other.getUnsignedMin());
APInt NewU = APIntOps::umin(getUnsignedMax(), Other.getUnsignedMax()) + 1;
- return getNonEmpty(std::move(NewL), std::move(NewU));
+ ConstantRange Res = getNonEmpty(std::move(NewL), std::move(NewU));
+ if (isWrappedSet() || Other.isWrappedSet())
+ return Res.intersectWith(unionWith(Other, Unsigned), Unsigned);
+ return Res;
}
ConstantRange
diff --git a/llvm/unittests/IR/ConstantRangeTest.cpp b/llvm/unittests/IR/ConstantRangeTest.cpp
index 2b9c56b4134f..12362b9460f9 100644
--- a/llvm/unittests/IR/ConstantRangeTest.cpp
+++ b/llvm/unittests/IR/ConstantRangeTest.cpp
@@ -1080,10 +1080,18 @@ TEST_F(ConstantRangeTest, UMax) {
EXPECT_EQ(Some.umax(Some), Some);
EXPECT_EQ(Some.umax(Wrap), ConstantRange(APInt(16, 0xa), APInt(16, 0)));
EXPECT_EQ(Some.umax(One), Some);
- // TODO: ConstantRange is currently over-conservative here.
- EXPECT_EQ(Wrap.umax(Wrap), Full);
+ EXPECT_EQ(Wrap.umax(Wrap), Wrap);
EXPECT_EQ(Wrap.umax(One), ConstantRange(APInt(16, 0xa), APInt(16, 0)));
EXPECT_EQ(One.umax(One), One);
+
+ TestBinaryOpExhaustive(
+ [](const ConstantRange &CR1, const ConstantRange &CR2) {
+ return CR1.umax(CR2);
+ },
+ [](const APInt &N1, const APInt &N2) {
+ return APIntOps::umax(N1, N2);
+ },
+ PreferSmallestNonFullUnsigned);
}
TEST_F(ConstantRangeTest, SMax) {
@@ -1105,6 +1113,15 @@ TEST_F(ConstantRangeTest, SMax) {
EXPECT_EQ(Wrap.smax(One), ConstantRange(APInt(16, 0xa),
APInt(16, (uint64_t)INT16_MIN)));
EXPECT_EQ(One.smax(One), One);
+
+ TestBinaryOpExhaustive(
+ [](const ConstantRange &CR1, const ConstantRange &CR2) {
+ return CR1.smax(CR2);
+ },
+ [](const APInt &N1, const APInt &N2) {
+ return APIntOps::smax(N1, N2);
+ },
+ PreferSmallestNonFullSigned);
}
TEST_F(ConstantRangeTest, UMin) {
@@ -1119,10 +1136,18 @@ TEST_F(ConstantRangeTest, UMin) {
EXPECT_EQ(Some.umin(Some), Some);
EXPECT_EQ(Some.umin(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa)));
EXPECT_EQ(Some.umin(One), One);
- // TODO: ConstantRange is currently over-conservative here.
- EXPECT_EQ(Wrap.umin(Wrap), Full);
+ EXPECT_EQ(Wrap.umin(Wrap), Wrap);
EXPECT_EQ(Wrap.umin(One), ConstantRange(APInt(16, 0), APInt(16, 0xb)));
EXPECT_EQ(One.umin(One), One);
+
+ TestBinaryOpExhaustive(
+ [](const ConstantRange &CR1, const ConstantRange &CR2) {
+ return CR1.umin(CR2);
+ },
+ [](const APInt &N1, const APInt &N2) {
+ return APIntOps::umin(N1, N2);
+ },
+ PreferSmallestNonFullUnsigned);
}
TEST_F(ConstantRangeTest, SMin) {
@@ -1139,11 +1164,19 @@ TEST_F(ConstantRangeTest, SMin) {
EXPECT_EQ(Some.smin(Wrap), ConstantRange(APInt(16, (uint64_t)INT16_MIN),
APInt(16, 0xaaa)));
EXPECT_EQ(Some.smin(One), One);
- // TODO: ConstantRange is currently over-conservative here.
- EXPECT_EQ(Wrap.smin(Wrap), Full);
+ EXPECT_EQ(Wrap.smin(Wrap), Wrap);
EXPECT_EQ(Wrap.smin(One), ConstantRange(APInt(16, (uint64_t)INT16_MIN),
APInt(16, 0xb)));
EXPECT_EQ(One.smin(One), One);
+
+ TestBinaryOpExhaustive(
+ [](const ConstantRange &CR1, const ConstantRange &CR2) {
+ return CR1.smin(CR2);
+ },
+ [](const APInt &N1, const APInt &N2) {
+ return APIntOps::smin(N1, N2);
+ },
+ PreferSmallestNonFullSigned);
}
TEST_F(ConstantRangeTest, UDiv) {
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