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; RUN: opt -instcombine -S < %s | FileCheck %s
target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128"
define i32 @test_load_cast_combine_tbaa(float* %ptr) {
; Ensure (cast (load (...))) -> (load (cast (...))) preserves TBAA.
; CHECK-LABEL: @test_load_cast_combine_tbaa(
; CHECK: load i32* %{{.*}}, !tbaa !0
entry:
%l = load float* %ptr, !tbaa !0
%c = bitcast float %l to i32
ret i32 %c
}
define i32 @test_load_cast_combine_noalias(float* %ptr) {
; Ensure (cast (load (...))) -> (load (cast (...))) preserves no-alias metadata.
; CHECK-LABEL: @test_load_cast_combine_noalias(
; CHECK: load i32* %{{.*}}, !alias.scope !2, !noalias !1
entry:
%l = load float* %ptr, !alias.scope !2, !noalias !1
%c = bitcast float %l to i32
ret i32 %c
}
define float @test_load_cast_combine_range(i32* %ptr) {
; Ensure (cast (load (...))) -> (load (cast (...))) drops range metadata. It
; would be nice to preserve or update it somehow but this is hard when moving
; between types.
; CHECK-LABEL: @test_load_cast_combine_range(
; CHECK: load float* %{{.*}}
; CHECK-NOT: !range
; CHECK: ret float
entry:
%l = load i32* %ptr, !range !5
%c = bitcast i32 %l to float
ret float %c
}
define i32 @test_load_cast_combine_invariant(float* %ptr) {
; Ensure (cast (load (...))) -> (load (cast (...))) preserves invariant metadata.
; CHECK-LABEL: @test_load_cast_combine_invariant(
; CHECK: load i32* %{{.*}}, !invariant.load !3
entry:
%l = load float* %ptr, !invariant.load !3
%c = bitcast float %l to i32
ret i32 %c
}
define i32 @test_load_cast_combine_nontemporal(float* %ptr) {
; Ensure (cast (load (...))) -> (load (cast (...))) preserves nontemporal
; metadata.
; CHECK-LABEL: @test_load_cast_combine_nontemporal(
; CHECK: load i32* %{{.*}}, !nontemporal !4
entry:
%l = load float* %ptr, !nontemporal !4
%c = bitcast float %l to i32
ret i32 %c
}
define void @test_load_cast_combine_loop(float* %src, i32* %dst, i32 %n) {
; Ensure (cast (load (...))) -> (load (cast (...))) preserves loop access
; metadata.
; CHECK-LABEL: @test_load_cast_combine_loop(
; CHECK: load i32* %{{.*}}, !llvm.mem.parallel_loop_access !1
entry:
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%src.gep = getelementptr inbounds float* %src, i32 %i
%dst.gep = getelementptr inbounds i32* %dst, i32 %i
%l = load float* %src.gep, !llvm.mem.parallel_loop_access !1
%c = bitcast float %l to i32
store i32 %c, i32* %dst.gep
%i.next = add i32 %i, 1
%cmp = icmp slt i32 %i.next, %n
br i1 %cmp, label %loop, label %exit, !llvm.loop !1
exit:
ret void
}
define void @test_load_cast_combine_nonnull(float** %ptr) {
; We can't preserve nonnull metadata when converting a load of a pointer to
; a load of an integer. Instead, we translate it to range metadata.
; FIXME: We should also transform range metadata back into nonnull metadata.
; FIXME: This test is very fragile. If any LABEL lines are added after
; this point, the test will fail, because this test depends on a metadata tuple,
; which is always emitted at the end of the file. At some point, we should
; consider an option to the IR printer to emit MD tuples after the function
; that first uses them--this will allow us to refer to them like this and not
; have the tests break. For now, this function must always come last in this
; file, and no LABEL lines are to be added after this point.
;
; CHECK-LABEL: @test_load_cast_combine_nonnull(
; CHECK: %[[V:.*]] = load i64* %{{.*}}, !range ![[MD:[0-9]+]]
; CHECK-NOT: !nonnull
; CHECK: store i64 %[[V]], i64*
entry:
%p = load float** %ptr, !nonnull !3
%gep = getelementptr float** %ptr, i32 42
store float* %p, float** %gep
ret void
}
; This is the metadata tuple that we reference above:
; CHECK: ![[MD]] = !{i64 1, i64 0}
!0 = !{ !1, !1, i64 0 }
!1 = !{ !1 }
!2 = !{ !2, !1 }
!3 = !{ }
!4 = !{ i32 1 }
!5 = !{ i32 0, i32 42 }
|
