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[CVP] Infer range return attribute #99620

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Merged
merged 3 commits into from
Sep 20, 2024
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[CVP] Infer range return attribute #99620

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46ab5f8
[CVP] Infer range return attribute
nikic Jul 19, 2024
599bf84
Fix clang test
nikic Sep 19, 2024
f8c7ecf
review feedback
nikic Sep 20, 2024
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2 changes: 1 addition & 1 deletion clang/test/CodeGenHLSL/BasicFeatures/OutputArguments.hlsl
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Expand Up @@ -83,7 +83,7 @@ void funky(inout int3 X) {
X.z += 3;
}

// ALL-LABEL: define noundef <3 x i32> {{.*}}case4
// ALL-LABEL: define noundef {{.*}}<3 x i32> {{.*}}case4

// This block initializes V = 0.xxx.
// CHECK: [[V:%.*]] = alloca <3 x i32>
Expand Down
22 changes: 22 additions & 0 deletions llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
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Expand Up @@ -1207,6 +1207,11 @@ static bool processAnd(BinaryOperator *BinOp, LazyValueInfo *LVI) {
static bool runImpl(Function &F, LazyValueInfo *LVI, DominatorTree *DT,
const SimplifyQuery &SQ) {
bool FnChanged = false;
std::optional<ConstantRange> RetRange;
if (F.hasExactDefinition() && F.getReturnType()->isIntOrIntVectorTy())
RetRange =
ConstantRange::getEmpty(F.getReturnType()->getScalarSizeInBits());

// Visiting in a pre-order depth-first traversal causes us to simplify early
// blocks before querying later blocks (which require us to analyze early
// blocks). Eagerly simplifying shallow blocks means there is strictly less
Expand Down Expand Up @@ -1277,6 +1282,11 @@ static bool runImpl(Function &F, LazyValueInfo *LVI, DominatorTree *DT,
// constant folding the return values of callees.
auto *RetVal = RI->getReturnValue();
if (!RetVal) break; // handle "ret void"
if (RetRange && !RetRange->isFullSet())
RetRange =
RetRange->unionWith(LVI->getConstantRange(RetVal, RI,
/*UndefAllowed=*/false));

if (isa<Constant>(RetVal)) break; // nothing to do
if (auto *C = getConstantAt(RetVal, RI, LVI)) {
++NumReturns;
Expand All @@ -1289,6 +1299,18 @@ static bool runImpl(Function &F, LazyValueInfo *LVI, DominatorTree *DT,
FnChanged |= BBChanged;
}

// Infer range attribute on return value.
if (RetRange && !RetRange->isFullSet()) {
Attribute RangeAttr = F.getRetAttribute(Attribute::Range);
if (RangeAttr.isValid())
RetRange = RetRange->intersectWith(RangeAttr.getRange());
// Don't add attribute for constant integer returns to reduce noise. These
// are propagated across functions by IPSCCP.
if (!RetRange->isEmptySet() && !RetRange->isSingleElement()) {
F.addRangeRetAttr(*RetRange);
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Missing FnChanged = true?

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Good point, fixed.

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Could we cause an inf loop if existing range attr is same as new one?

FnChanged = true;
}
}
return FnChanged;
}

Expand Down
2 changes: 1 addition & 1 deletion llvm/test/Transforms/CorrelatedValuePropagation/add.ll
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Expand Up @@ -311,7 +311,7 @@ exit:

@limit = external global i32
define i32 @test11(ptr %p, i32 %i) {
; CHECK-LABEL: define i32 @test11(
; CHECK-LABEL: define range(i32 0, 2147483645) i32 @test11(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[LIMIT:%.*]] = load i32, ptr [[P]], align 4, !range [[RNG0:![0-9]+]]
; CHECK-NEXT: [[WITHIN_1:%.*]] = icmp ugt i32 [[LIMIT]], [[I]]
Expand Down
8 changes: 4 additions & 4 deletions llvm/test/Transforms/CorrelatedValuePropagation/ashr.ll
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Expand Up @@ -159,7 +159,7 @@ exit:

; check that ashr of -1 or 0 is optimized away
define i32 @test6(i32 %f, i32 %g) {
; CHECK-LABEL: define i32 @test6(
; CHECK-LABEL: define range(i32 -1, 1) i32 @test6(
; CHECK-SAME: i32 [[F:%.*]], i32 [[G:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[F]], 1
Expand All @@ -177,7 +177,7 @@ entry:

; same test as above with different numbers
define i32 @test7(i32 %f, i32 %g) {
; CHECK-LABEL: define i32 @test7(
; CHECK-LABEL: define range(i32 -1, 1) i32 @test7(
; CHECK-SAME: i32 [[F:%.*]], i32 [[G:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TMP0:%.*]] = and i32 [[F]], -2
Expand All @@ -197,7 +197,7 @@ entry:

; check that ashr of -2 or 1 is not optimized away
define i32 @test8(i32 %f, i32 %g, i1 %s) {
; CHECK-LABEL: define i32 @test8(
; CHECK-LABEL: define range(i32 -2, 2) i32 @test8(
; CHECK-SAME: i32 [[F:%.*]], i32 [[G:%.*]], i1 [[S:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TMP0:%.*]] = ashr i32 -2, [[F]]
Expand All @@ -213,7 +213,7 @@ entry:
}

define i32 @may_including_undef(i1 %c.1, i1 %c.2) {
; CHECK-LABEL: define i32 @may_including_undef(
; CHECK-LABEL: define range(i32 -1073741824, 1073741824) i32 @may_including_undef(
; CHECK-SAME: i1 [[C_1:%.*]], i1 [[C_2:%.*]]) {
; CHECK-NEXT: br i1 [[C_1]], label %[[TRUE_1:.*]], label %[[FALSE:.*]]
; CHECK: [[TRUE_1]]:
Expand Down
18 changes: 9 additions & 9 deletions llvm/test/Transforms/CorrelatedValuePropagation/basic.ll
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Expand Up @@ -3,7 +3,7 @@
; PR2581

define i32 @test1(i1 %C) {
; CHECK-LABEL: define i32 @test1
; CHECK-LABEL: define range(i32 10, 12) i32 @test1
; CHECK-SAME: (i1 [[C:%.*]]) {
; CHECK-NEXT: br i1 [[C]], label [[EXIT:%.*]], label [[BODY:%.*]]
; CHECK: body:
Expand Down Expand Up @@ -82,7 +82,7 @@ bb2:

; PR1757
define i32 @test4(i32) {
; CHECK-LABEL: define i32 @test4
; CHECK-LABEL: define range(i32 0, 3) i32 @test4
; CHECK-SAME: (i32 [[TMP0:%.*]]) {
; CHECK-NEXT: EntryBlock:
; CHECK-NEXT: [[DOTDEMORGAN:%.*]] = icmp sgt i32 [[TMP0]], 2
Expand Down Expand Up @@ -210,7 +210,7 @@ return:
}

define i32 @switch1(i32 %s) {
; CHECK-LABEL: define i32 @switch1
; CHECK-LABEL: define range(i32 -1, 2) i32 @switch1
; CHECK-SAME: (i32 [[S:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[S]], 0
Expand Down Expand Up @@ -250,7 +250,7 @@ next:
}

define i32 @switch2(i32 %s) {
; CHECK-LABEL: define i32 @switch2
; CHECK-LABEL: define range(i32 -1, 2) i32 @switch2
; CHECK-SAME: (i32 [[S:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[S]], 0
Expand Down Expand Up @@ -284,7 +284,7 @@ next:
}

define i32 @switch3(i32 %s) {
; CHECK-LABEL: define i32 @switch3
; CHECK-LABEL: define range(i32 -1, 2) i32 @switch3
; CHECK-SAME: (i32 [[S:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[S]], 0
Expand Down Expand Up @@ -451,7 +451,7 @@ unreachable:
}

define i32 @switch_range(i32 %cond) {
; CHECK-LABEL: define i32 @switch_range
; CHECK-LABEL: define range(i32 1, 3) i32 @switch_range
; CHECK-SAME: (i32 [[COND:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[S:%.*]] = urem i32 [[COND]], 3
Expand Down Expand Up @@ -491,7 +491,7 @@ unreachable:
; switch condition, we should not change the default.

define i32 @switch_range_not_full(i32 %cond) {
; CHECK-LABEL: define i32 @switch_range_not_full
; CHECK-LABEL: define range(i32 0, 3) i32 @switch_range_not_full
; CHECK-SAME: (i32 [[COND:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[S:%.*]] = urem i32 [[COND]], 3
Expand Down Expand Up @@ -2052,7 +2052,7 @@ define i1 @binop_eval_order(i32 %x) {
}

define range(i32 0, 1024) i32 @range_larger(i8 %x) {
; CHECK-LABEL: define range(i32 0, 1024) i32 @range_larger
; CHECK-LABEL: define range(i32 0, 256) i32 @range_larger
; CHECK-SAME: (i8 [[X:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext i8 [[X]] to i32
; CHECK-NEXT: ret i32 [[ZEXT]]
Expand All @@ -2072,7 +2072,7 @@ define range(i32 0, 128) i32 @range_smaller(i8 %x) {
}

define range(i32 128, 512) i32 @range_intersect(i8 %x) {
; CHECK-LABEL: define range(i32 128, 512) i32 @range_intersect
; CHECK-LABEL: define range(i32 128, 256) i32 @range_intersect
; CHECK-SAME: (i8 [[X:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext i8 [[X]] to i32
; CHECK-NEXT: ret i32 [[ZEXT]]
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/Transforms/CorrelatedValuePropagation/cond-using-block-value.ll
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Expand Up @@ -38,7 +38,7 @@ end:
}

define i64 @test_sext_from_implied_cond(i32 %a, i32 %b) {
; CHECK-LABEL: define i64 @test_sext_from_implied_cond(
; CHECK-LABEL: define range(i64 0, 2147483647) i64 @test_sext_from_implied_cond(
; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT: [[A_CMP:%.*]] = icmp slt i32 [[A]], 0
; CHECK-NEXT: br i1 [[A_CMP]], label [[END:%.*]], label [[L1:%.*]]
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/Transforms/CorrelatedValuePropagation/select.ll
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Expand Up @@ -141,7 +141,7 @@ else:
}

define i8 @not_correlated(i1, i1) {
; CHECK-LABEL: define i8 @not_correlated
; CHECK-LABEL: define range(i8 0, 2) i8 @not_correlated
; CHECK-SAME: (i1 [[TMP0:%.*]], i1 [[TMP1:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[S:%.*]] = select i1 [[TMP0]], i8 0, i8 1
Expand Down Expand Up @@ -361,7 +361,7 @@ exit:
}

define i64 @select_cond_may_undef(i32 %a) {
; CHECK-LABEL: define i64 @select_cond_may_undef
; CHECK-LABEL: define range(i64 -2147483648, 2147483648) i64 @select_cond_may_undef
; CHECK-SAME: (i32 [[A:%.*]]) {
; CHECK-NEXT: [[IS_A_NONNEGATIVE:%.*]] = icmp sgt i32 [[A]], 1
; CHECK-NEXT: [[NARROW:%.*]] = select i1 [[IS_A_NONNEGATIVE]], i32 [[A]], i32 0
Expand Down
32 changes: 16 additions & 16 deletions llvm/test/Transforms/CorrelatedValuePropagation/vectors.ll
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Expand Up @@ -60,7 +60,7 @@ define <2 x i1> @cmp_signedness(<2 x i8> %a) {
}

define <2 x i16> @infer_nowrap(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @infer_nowrap(
; CHECK-LABEL: define range(i16 1, 257) <2 x i16> @infer_nowrap(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES:%.*]] = add nuw nsw <2 x i16> [[ZEXT]], <i16 1, i16 1>
Expand All @@ -72,7 +72,7 @@ define <2 x i16> @infer_nowrap(<2 x i8> %a) {
}

define <2 x i16> @infer_nowrap_nonsplat(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @infer_nowrap_nonsplat(
; CHECK-LABEL: define range(i16 1, 258) <2 x i16> @infer_nowrap_nonsplat(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES:%.*]] = add nuw nsw <2 x i16> [[ZEXT]], <i16 1, i16 2>
Expand All @@ -84,7 +84,7 @@ define <2 x i16> @infer_nowrap_nonsplat(<2 x i8> %a) {
}

define <vscale x 2 x i16> @infer_nowrap_scalable(<vscale x 2 x i8> %a) {
; CHECK-LABEL: define <vscale x 2 x i16> @infer_nowrap_scalable(
; CHECK-LABEL: define range(i16 1, 257) <vscale x 2 x i16> @infer_nowrap_scalable(
; CHECK-SAME: <vscale x 2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <vscale x 2 x i8> [[A]] to <vscale x 2 x i16>
; CHECK-NEXT: [[RES:%.*]] = add nuw nsw <vscale x 2 x i16> [[ZEXT]], shufflevector (<vscale x 2 x i16> insertelement (<vscale x 2 x i16> poison, i16 1, i64 0), <vscale x 2 x i16> poison, <vscale x 2 x i32> zeroinitializer)
Expand All @@ -96,7 +96,7 @@ define <vscale x 2 x i16> @infer_nowrap_scalable(<vscale x 2 x i8> %a) {
}

define <2 x i16> @infer_nowrap_poison(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @infer_nowrap_poison(
; CHECK-LABEL: define range(i16 1, 257) <2 x i16> @infer_nowrap_poison(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES:%.*]] = add nuw nsw <2 x i16> [[ZEXT]], <i16 1, i16 poison>
Expand All @@ -108,7 +108,7 @@ define <2 x i16> @infer_nowrap_poison(<2 x i8> %a) {
}

define <2 x i16> @infer_nowrap_nonsplat_nsw_only(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @infer_nowrap_nonsplat_nsw_only(
; CHECK-LABEL: define range(i16 -1, 257) <2 x i16> @infer_nowrap_nonsplat_nsw_only(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES:%.*]] = add nsw <2 x i16> [[ZEXT]], <i16 1, i16 -1>
Expand All @@ -120,7 +120,7 @@ define <2 x i16> @infer_nowrap_nonsplat_nsw_only(<2 x i8> %a) {
}

define <2 x i16> @abs(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @abs(
; CHECK-LABEL: define range(i16 0, 256) <2 x i16> @abs(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: ret <2 x i16> [[ZEXT]]
Expand All @@ -131,7 +131,7 @@ define <2 x i16> @abs(<2 x i8> %a) {
}

define <2 x i16> @saturating(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @saturating(
; CHECK-LABEL: define range(i16 1, 257) <2 x i16> @saturating(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES:%.*]] = add nuw nsw <2 x i16> [[ZEXT]], <i16 1, i16 1>
Expand All @@ -156,7 +156,7 @@ define {<2 x i16>, <2 x i1>} @with_overflow(<2 x i8> %a) {
}

define <2 x i16> @srem1(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @srem1(
; CHECK-LABEL: define range(i16 0, 42) <2 x i16> @srem1(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES1_LHS_TRUNC:%.*]] = trunc <2 x i16> [[ZEXT]] to <2 x i8>
Expand All @@ -170,7 +170,7 @@ define <2 x i16> @srem1(<2 x i8> %a) {
}

define <2 x i16> @srem2(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @srem2(
; CHECK-LABEL: define range(i16 -41, 42) <2 x i16> @srem2(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = sext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES_LHS_TRUNC:%.*]] = trunc <2 x i16> [[ZEXT]] to <2 x i8>
Expand All @@ -184,7 +184,7 @@ define <2 x i16> @srem2(<2 x i8> %a) {
}

define <2 x i16> @ashr(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @ashr(
; CHECK-LABEL: define range(i16 0, 128) <2 x i16> @ashr(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES:%.*]] = lshr <2 x i16> [[ZEXT]], <i16 1, i16 1>
Expand All @@ -196,7 +196,7 @@ define <2 x i16> @ashr(<2 x i8> %a) {
}

define <2 x i32> @sext(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i32> @sext(
; CHECK-LABEL: define range(i32 0, 256) <2 x i32> @sext(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: [[RES:%.*]] = zext nneg <2 x i16> [[ZEXT]] to <2 x i32>
Expand All @@ -220,7 +220,7 @@ define <2 x float> @sitofp(<2 x i8> %a) {
}

define <2 x i16> @and(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @and(
; CHECK-LABEL: define range(i16 0, 256) <2 x i16> @and(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: ret <2 x i16> [[ZEXT]]
Expand All @@ -231,7 +231,7 @@ define <2 x i16> @and(<2 x i8> %a) {
}

define <2 x i16> @and_with_poison(<2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @and_with_poison(
; CHECK-LABEL: define range(i16 0, 256) <2 x i16> @and_with_poison(
; CHECK-SAME: <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
; CHECK-NEXT: ret <2 x i16> [[ZEXT]]
Expand All @@ -242,7 +242,7 @@ define <2 x i16> @and_with_poison(<2 x i8> %a) {
}

define <4 x i64> @issue_97674_getConstantOnEdge(i1 %cond) {
; CHECK-LABEL: define <4 x i64> @issue_97674_getConstantOnEdge(
; CHECK-LABEL: define range(i64 0, 2) <4 x i64> @issue_97674_getConstantOnEdge(
; CHECK-SAME: i1 [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: br i1 [[COND]], label %[[IF_THEN:.*]], label %[[IF_END:.*]]
Expand Down Expand Up @@ -277,7 +277,7 @@ entry:
}

define <2 x i16> @phi_merge1(i1 %c, <2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @phi_merge1(
; CHECK-LABEL: define range(i16 2, 259) <2 x i16> @phi_merge1(
; CHECK-SAME: i1 [[C:%.*]], <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
Expand All @@ -303,7 +303,7 @@ join:
}

define <2 x i16> @phi_merge2(i1 %c, <2 x i8> %a) {
; CHECK-LABEL: define <2 x i16> @phi_merge2(
; CHECK-LABEL: define range(i16 2, 259) <2 x i16> @phi_merge2(
; CHECK-SAME: i1 [[C:%.*]], <2 x i8> [[A:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[ZEXT:%.*]] = zext <2 x i8> [[A]] to <2 x i16>
Expand Down
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