223 lines
6.4 KiB
LLVM
223 lines
6.4 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=instsimplify < %s | FileCheck %s
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declare void @bar(ptr %a, ptr nonnull noundef %b)
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declare void @bar_without_noundef(ptr %a, ptr nonnull %b)
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; 'y' must be nonnull.
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define i1 @caller1(ptr %x, ptr %y) {
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; CHECK-LABEL: @caller1(
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; CHECK-NEXT: call void @bar(ptr [[X:%.*]], ptr [[Y:%.*]])
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; CHECK-NEXT: ret i1 false
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;
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call void @bar(ptr %x, ptr %y)
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%null_check = icmp eq ptr %y, null
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ret i1 %null_check
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}
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; Don't know anything about 'y'.
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define i1 @caller1_maybepoison(ptr %x, ptr %y) {
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; CHECK-LABEL: @caller1_maybepoison(
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; CHECK-NEXT: call void @bar_without_noundef(ptr [[X:%.*]], ptr [[Y:%.*]])
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq ptr [[Y]], null
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; CHECK-NEXT: ret i1 [[NULL_CHECK]]
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;
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call void @bar_without_noundef(ptr %x, ptr %y)
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%null_check = icmp eq ptr %y, null
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ret i1 %null_check
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}
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; Don't know anything about 'y'.
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define i1 @caller2(ptr %x, ptr %y) {
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; CHECK-LABEL: @caller2(
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; CHECK-NEXT: call void @bar(ptr [[Y:%.*]], ptr [[X:%.*]])
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq ptr [[Y]], null
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; CHECK-NEXT: ret i1 [[NULL_CHECK]]
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;
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call void @bar(ptr %y, ptr %x)
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%null_check = icmp eq ptr %y, null
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ret i1 %null_check
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}
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; 'y' must be nonnull.
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define i1 @caller3(ptr %x, ptr %y) {
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; CHECK-LABEL: @caller3(
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; CHECK-NEXT: call void @bar(ptr [[X:%.*]], ptr [[Y:%.*]])
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; CHECK-NEXT: ret i1 true
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;
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call void @bar(ptr %x, ptr %y)
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%null_check = icmp ne ptr %y, null
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ret i1 %null_check
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}
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; FIXME: The call is guaranteed to execute, so 'y' must be nonnull throughout.
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define i1 @caller4(ptr %x, ptr %y) {
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; CHECK-LABEL: @caller4(
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp ne ptr [[Y:%.*]], null
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; CHECK-NEXT: call void @bar(ptr [[X:%.*]], ptr [[Y]])
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; CHECK-NEXT: ret i1 [[NULL_CHECK]]
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;
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%null_check = icmp ne ptr %y, null
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call void @bar(ptr %x, ptr %y)
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ret i1 %null_check
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}
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; The call to bar() does not dominate the null check, so no change.
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define i1 @caller5(ptr %x, ptr %y) {
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; CHECK-LABEL: @caller5(
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq ptr [[Y:%.*]], null
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; CHECK-NEXT: br i1 [[NULL_CHECK]], label [[T:%.*]], label [[F:%.*]]
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; CHECK: t:
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; CHECK-NEXT: ret i1 [[NULL_CHECK]]
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; CHECK: f:
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; CHECK-NEXT: call void @bar(ptr [[X:%.*]], ptr [[Y]])
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; CHECK-NEXT: ret i1 [[NULL_CHECK]]
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;
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%null_check = icmp eq ptr %y, null
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br i1 %null_check, label %t, label %f
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t:
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ret i1 %null_check
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f:
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call void @bar(ptr %x, ptr %y)
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ret i1 %null_check
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}
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; Make sure that an invoke works similarly to a call.
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declare i32 @esfp(...)
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define i1 @caller6(ptr %x, ptr %y) personality ptr @esfp{
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; CHECK-LABEL: @caller6(
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; CHECK-NEXT: invoke void @bar(ptr [[X:%.*]], ptr nonnull [[Y:%.*]])
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; CHECK-NEXT: to label [[CONT:%.*]] unwind label [[EXC:%.*]]
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; CHECK: cont:
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; CHECK-NEXT: ret i1 false
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; CHECK: exc:
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; CHECK-NEXT: [[LP:%.*]] = landingpad { ptr, i32 }
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; CHECK-NEXT: filter [0 x ptr] zeroinitializer
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; CHECK-NEXT: unreachable
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;
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invoke void @bar(ptr %x, ptr nonnull %y)
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to label %cont unwind label %exc
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cont:
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%null_check = icmp eq ptr %y, null
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ret i1 %null_check
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exc:
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%lp = landingpad { ptr, i32 }
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filter [0 x ptr] zeroinitializer
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unreachable
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}
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declare ptr @returningPtr(ptr returned %p)
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define i1 @nonnullReturnTest(ptr nonnull %x) {
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; CHECK-LABEL: @nonnullReturnTest(
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; CHECK-NEXT: [[X2:%.*]] = call ptr @returningPtr(ptr [[X:%.*]])
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; CHECK-NEXT: ret i1 false
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;
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%x2 = call ptr @returningPtr(ptr %x)
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%null_check = icmp eq ptr %x2, null
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ret i1 %null_check
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}
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define i1 @unknownReturnTest(ptr %x) {
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; CHECK-LABEL: @unknownReturnTest(
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; CHECK-NEXT: [[X2:%.*]] = call ptr @returningPtr(ptr [[X:%.*]])
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq ptr [[X2]], null
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; CHECK-NEXT: ret i1 [[NULL_CHECK]]
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;
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%x2 = call ptr @returningPtr(ptr %x)
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%null_check = icmp eq ptr %x2, null
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ret i1 %null_check
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}
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; Make sure that if load/store happened, the pointer is nonnull.
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define i32 @test_null_after_store(ptr %0) {
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; CHECK-LABEL: @test_null_after_store(
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; CHECK-NEXT: store i32 123, ptr [[TMP0:%.*]], align 4
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; CHECK-NEXT: ret i32 2
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;
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store i32 123, ptr %0, align 4
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%2 = icmp eq ptr %0, null
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%3 = select i1 %2, i32 1, i32 2
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ret i32 %3
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}
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define i32 @test_null_after_load(ptr %0) {
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; CHECK-LABEL: @test_null_after_load(
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; CHECK-NEXT: ret i32 1
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;
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%2 = load i32, ptr %0, align 4
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%3 = icmp eq ptr %0, null
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%4 = select i1 %3, i32 %2, i32 1
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ret i32 %4
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}
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; Make sure that different address space does not affect null pointer check.
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define i32 @test_null_after_store_addrspace(ptr addrspace(1) %0) {
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; CHECK-LABEL: @test_null_after_store_addrspace(
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; CHECK-NEXT: store i32 123, ptr addrspace(1) [[TMP0:%.*]], align 4
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; CHECK-NEXT: [[TMP2:%.*]] = icmp eq ptr addrspace(1) [[TMP0]], null
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; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP2]], i32 1, i32 2
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; CHECK-NEXT: ret i32 [[TMP3]]
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;
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store i32 123, ptr addrspace(1) %0, align 4
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%2 = icmp eq ptr addrspace(1) %0, null
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%3 = select i1 %2, i32 1, i32 2
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ret i32 %3
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}
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define i32 @test_null_after_load_addrspace(ptr addrspace(1) %0) {
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; CHECK-LABEL: @test_null_after_load_addrspace(
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; CHECK-NEXT: [[TMP2:%.*]] = load i32, ptr addrspace(1) [[TMP0:%.*]], align 4
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; CHECK-NEXT: [[TMP3:%.*]] = icmp eq ptr addrspace(1) [[TMP0]], null
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; CHECK-NEXT: [[TMP4:%.*]] = select i1 [[TMP3]], i32 [[TMP2]], i32 1
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; CHECK-NEXT: ret i32 [[TMP4]]
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;
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%2 = load i32, ptr addrspace(1) %0, align 4
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%3 = icmp eq ptr addrspace(1) %0, null
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%4 = select i1 %3, i32 %2, i32 1
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ret i32 %4
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}
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; Make sure if store happened after the check, nullptr check is not removed.
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declare ptr @func(i64)
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define ptr @test_load_store_after_check(ptr %0) {
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; CHECK-LABEL: @test_load_store_after_check(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP1:%.*]] = call ptr @func(i64 0)
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq ptr [[TMP1]], null
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; CHECK-NEXT: br i1 [[NULL_CHECK]], label [[RETURN:%.*]], label [[IF_END:%.*]]
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; CHECK: if.end:
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; CHECK-NEXT: store i8 7, ptr [[TMP1]], align 1
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; CHECK-NEXT: br label [[RETURN]]
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; CHECK: return:
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; CHECK-NEXT: [[RETVAL_0:%.*]] = phi ptr [ [[TMP1]], [[IF_END]] ], [ null, [[ENTRY:%.*]] ]
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; CHECK-NEXT: ret ptr [[RETVAL_0]]
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;
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entry:
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%1 = call ptr @func(i64 0)
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%null_check = icmp eq ptr %1, null
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br i1 %null_check, label %return, label %if.end
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if.end:
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store i8 7, ptr %1
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br label %return
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return:
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%retval.0 = phi ptr [ %1, %if.end ], [ null, %entry ]
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ret ptr %retval.0
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}
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