derek.holloway
7502bf64a4
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67 lines
2.8 KiB
LLVM
67 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; Check that assume is propagated backwards through all
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; operations that are `isGuaranteedToTransferExecutionToSuccessor`
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define i32 @assume_inevitable(ptr %a, ptr %b, ptr %c) {
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; CHECK-LABEL: @assume_inevitable(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[M:%.*]] = alloca i64, align 8
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[A:%.*]], align 4
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; CHECK-NEXT: [[LOADRES:%.*]] = load i32, ptr [[B:%.*]], align 4
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; CHECK-NEXT: [[LOADRES2:%.*]] = call i32 @llvm.annotation.i32.p0(i32 [[LOADRES]], ptr nonnull @.str, ptr nonnull @.str1, i32 2)
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; CHECK-NEXT: store i32 [[LOADRES2]], ptr [[A]], align 4
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; CHECK-NEXT: [[DUMMY_EQ:%.*]] = icmp ugt i32 [[LOADRES]], 42
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[DUMMY_EQ]])
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; CHECK-NEXT: [[M_A:%.*]] = call ptr @llvm.ptr.annotation.p0.p0(ptr nonnull [[M]], ptr nonnull @.str, ptr nonnull @.str1, i32 2, ptr null)
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; CHECK-NEXT: [[OBJSZ:%.*]] = call i64 @llvm.objectsize.i64.p0(ptr [[C:%.*]], i1 false, i1 false, i1 false)
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; CHECK-NEXT: store i64 [[OBJSZ]], ptr [[M_A]], align 4
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[A]], i64 32) ]
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; CHECK-NEXT: ret i32 [[TMP0]]
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;
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entry:
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%dummy = alloca i8, align 4
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%m = alloca i64
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%0 = load i32, ptr %a, align 4
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; START perform a bunch of inevitable operations
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%loadres = load i32, ptr %b
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%loadres2 = call i32 @llvm.annotation.i32(i32 %loadres, ptr @.str, ptr @.str1, i32 2)
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store i32 %loadres2, ptr %a
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%dummy_eq = icmp ugt i32 %loadres, 42
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tail call void @llvm.assume(i1 %dummy_eq)
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call void @llvm.lifetime.start.p0(ptr %dummy)
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%i = call ptr @llvm.invariant.start.p0(i64 1, ptr %dummy)
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call void @llvm.invariant.end.p0(ptr %i, i64 1, ptr %dummy)
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call void @llvm.lifetime.end.p0(ptr %dummy)
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%m_a = call ptr @llvm.ptr.annotation.p0(ptr %m, ptr @.str, ptr @.str1, i32 2, ptr null)
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%objsz = call i64 @llvm.objectsize.i64.p0(ptr %c, i1 false)
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store i64 %objsz, ptr %m_a
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; END perform a bunch of inevitable operations
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; AND here's the assume:
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%ptrint = ptrtoint ptr %a to i64
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%maskedptr = and i64 %ptrint, 31
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%maskcond = icmp eq i64 %maskedptr, 0
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tail call void @llvm.assume(i1 %maskcond)
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ret i32 %0
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}
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@.str = private unnamed_addr constant [4 x i8] c"sth\00", section "llvm.metadata"
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@.str1 = private unnamed_addr constant [4 x i8] c"t.c\00", section "llvm.metadata"
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declare i64 @llvm.objectsize.i64.p0(ptr, i1)
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declare i32 @llvm.annotation.i32(i32, ptr, ptr, i32)
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declare ptr @llvm.ptr.annotation.p0(ptr, ptr, ptr, i32, ptr)
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declare void @llvm.lifetime.start.p0(ptr nocapture)
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declare void @llvm.lifetime.end.p0(ptr nocapture)
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declare ptr @llvm.invariant.start.p0(i64, ptr nocapture)
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declare void @llvm.invariant.end.p0(ptr, i64, ptr nocapture)
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declare void @llvm.assume(i1)
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