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135 lines
4.1 KiB
LLVM
135 lines
4.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -licm < %s | FileCheck %s
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; Note: the !invariant.load is there just solely to let us call @use()
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; to add a fake use, and still have the aliasing work out. The call
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; to @use(0) is just to provide a may-unwind exit out of the loop, so
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; that LICM cannot hoist out the load simply because it is guaranteed
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; to execute.
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declare void @use(i32)
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define void @f_0(i8* align 4 dereferenceable(1024) %ptr) {
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; CHECK-LABEL: @f_0(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[PTR_GEP:%.*]] = getelementptr i8, i8* [[PTR:%.*]], i32 32
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; CHECK-NEXT: [[PTR_I32:%.*]] = bitcast i8* [[PTR_GEP]] to i32*
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; CHECK-NEXT: [[VAL:%.*]] = load i32, i32* [[PTR_I32]], align 4
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: call void @use(i32 0)
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; CHECK-NEXT: call void @use(i32 [[VAL]])
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; CHECK-NEXT: br label [[LOOP]]
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;
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entry:
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%ptr.gep = getelementptr i8, i8* %ptr, i32 32
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%ptr.i32 = bitcast i8* %ptr.gep to i32*
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br label %loop
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loop:
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call void @use(i32 0)
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%val = load i32, i32* %ptr.i32, !invariant.load !{}
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call void @use(i32 %val)
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br label %loop
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}
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define void @f_1(i8* align 4 dereferenceable_or_null(1024) %ptr) {
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; CHECK-LABEL: @f_1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[PTR_GEP:%.*]] = getelementptr i8, i8* [[PTR:%.*]], i32 32
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; CHECK-NEXT: [[PTR_I32:%.*]] = bitcast i8* [[PTR_GEP]] to i32*
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; CHECK-NEXT: [[PTR_IS_NULL:%.*]] = icmp eq i8* [[PTR]], null
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; CHECK-NEXT: br i1 [[PTR_IS_NULL]], label [[LEAVE:%.*]], label [[LOOP_PREHEADER:%.*]]
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[VAL:%.*]] = load i32, i32* [[PTR_I32]], align 4
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: call void @use(i32 0)
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; CHECK-NEXT: call void @use(i32 [[VAL]])
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; CHECK-NEXT: br label [[LOOP]]
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; CHECK: leave:
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; CHECK-NEXT: ret void
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;
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entry:
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%ptr.gep = getelementptr i8, i8* %ptr, i32 32
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%ptr.i32 = bitcast i8* %ptr.gep to i32*
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%ptr_is_null = icmp eq i8* %ptr, null
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br i1 %ptr_is_null, label %leave, label %loop
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loop:
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call void @use(i32 0)
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%val = load i32, i32* %ptr.i32, !invariant.load !{}
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call void @use(i32 %val)
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br label %loop
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leave:
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ret void
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}
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define void @f_2(i8* align 4 dereferenceable_or_null(1024) %ptr) {
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; CHECK-LABEL: @f_2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[PTR_GEP:%.*]] = getelementptr i8, i8* [[PTR:%.*]], i32 30
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; CHECK-NEXT: [[PTR_I32:%.*]] = bitcast i8* [[PTR_GEP]] to i32*
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; CHECK-NEXT: [[PTR_IS_NULL:%.*]] = icmp eq i8* [[PTR]], null
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; CHECK-NEXT: br i1 [[PTR_IS_NULL]], label [[LEAVE:%.*]], label [[LOOP_PREHEADER:%.*]]
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; CHECK: loop.preheader:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: call void @use(i32 0)
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; CHECK-NEXT: [[VAL:%.*]] = load i32, i32* [[PTR_I32]], align 4, !invariant.load !0
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; CHECK-NEXT: call void @use(i32 [[VAL]])
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; CHECK-NEXT: br label [[LOOP]]
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; CHECK: leave:
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; CHECK-NEXT: ret void
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;
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entry:
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;; Can't hoist, since the alignment does not work out -- (<4 byte
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;; aligned> + 30) is not necessarily 4 byte aligned.
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%ptr.gep = getelementptr i8, i8* %ptr, i32 30
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%ptr.i32 = bitcast i8* %ptr.gep to i32*
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%ptr_is_null = icmp eq i8* %ptr, null
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br i1 %ptr_is_null, label %leave, label %loop
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loop:
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call void @use(i32 0)
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%val = load i32, i32* %ptr.i32, !invariant.load !{}
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call void @use(i32 %val)
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br label %loop
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leave:
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ret void
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}
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define void @checkLaunder(i8* align 4 dereferenceable(1024) %p) {
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; CHECK-LABEL: @checkLaunder(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[L:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* [[P:%.*]])
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; CHECK-NEXT: [[VAL:%.*]] = load i8, i8* [[L]], align 1
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: call void @use(i32 0)
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; CHECK-NEXT: call void @use8(i8 [[VAL]])
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; CHECK-NEXT: br label [[LOOP]]
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;
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entry:
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%l = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
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br label %loop
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loop:
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call void @use(i32 0)
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%val = load i8, i8* %l, !invariant.load !{}
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call void @use8(i8 %val)
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br label %loop
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}
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declare i8* @llvm.launder.invariant.group.p0i8(i8*)
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declare void @use8(i8)
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