115 lines
4.0 KiB
LLVM
115 lines
4.0 KiB
LLVM
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; RUN: opt -lower-constant-intrinsics -S < %s | FileCheck %s
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;; Ensure that an unfoldable is.constant gets lowered reasonably in
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;; optimized codegen, in particular, that the "true" branch is
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;; eliminated.
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;; Also ensure that any unfoldable objectsize is resolved in order.
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;; CHECK-NOT: tail call i32 @subfun_1()
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;; CHECK: tail call i32 @subfun_2()
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;; CHECK-NOT: tail call i32 @subfun_1()
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declare i1 @llvm.is.constant.i32(i32 %a) nounwind readnone
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declare i1 @llvm.is.constant.i64(i64 %a) nounwind readnone
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declare i1 @llvm.is.constant.i256(i256 %a) nounwind readnone
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declare i1 @llvm.is.constant.v2i64(<2 x i64> %a) nounwind readnone
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declare i1 @llvm.is.constant.f32(float %a) nounwind readnone
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declare i1 @llvm.is.constant.sl_i32i32s({i32, i32} %a) nounwind readnone
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declare i1 @llvm.is.constant.a2i64([2 x i64] %a) nounwind readnone
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declare i1 @llvm.is.constant.p0i64(i64* %a) nounwind readnone
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declare i64 @llvm.objectsize.i64.p0i8(i8*, i1, i1, i1) nounwind readnone
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declare i32 @subfun_1()
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declare i32 @subfun_2()
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define i32 @test_branch(i32 %in) nounwind {
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%v = call i1 @llvm.is.constant.i32(i32 %in)
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br i1 %v, label %True, label %False
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True:
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%call1 = tail call i32 @subfun_1()
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ret i32 %call1
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False:
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%call2 = tail call i32 @subfun_2()
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ret i32 %call2
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}
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;; llvm.objectsize is another tricky case which gets folded to -1 very
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;; late in the game. We'd like to ensure that llvm.is.constant of
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;; llvm.objectsize is true.
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define i1 @test_objectsize(i8* %obj) nounwind {
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;; CHECK-LABEL: test_objectsize
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;; CHECK-NOT: llvm.objectsize
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;; CHECK-NOT: llvm.is.constant
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;; CHECK: ret i1 true
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%os = call i64 @llvm.objectsize.i64.p0i8(i8* %obj, i1 false, i1 false, i1 false)
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%os1 = add i64 %os, 1
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%v = call i1 @llvm.is.constant.i64(i64 %os1)
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ret i1 %v
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}
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@test_phi_a = dso_local global i32 0, align 4
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declare dso_local i32 @test_phi_b(...)
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; Function Attrs: nounwind uwtable
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define dso_local i32 @test_phi() {
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entry:
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%0 = load i32, i32* @test_phi_a, align 4
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%1 = tail call i1 @llvm.is.constant.i32(i32 %0)
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br i1 %1, label %cond.end, label %cond.false
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cond.false: ; preds = %entry
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%call = tail call i32 bitcast (i32 (...)* @test_phi_b to i32 ()*)() #3
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%.pre = load i32, i32* @test_phi_a, align 4
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br label %cond.end
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cond.end: ; preds = %entry, %cond.false
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%2 = phi i32 [ %.pre, %cond.false ], [ %0, %entry ]
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%cond = phi i32 [ %call, %cond.false ], [ 1, %entry ]
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%cmp = icmp eq i32 %cond, %2
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br i1 %cmp, label %cond.true1, label %cond.end4
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cond.true1: ; preds = %cond.end
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%call2 = tail call i32 bitcast (i32 (...)* @test_phi_b to i32 ()*)() #3
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br label %cond.end4
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cond.end4: ; preds = %cond.end, %cond.true1
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ret i32 undef
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}
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define i1 @test_various_types(i256 %int, float %float, <2 x i64> %vec, {i32, i32} %struct, [2 x i64] %arr, i64* %ptr) #0 {
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; CHECK-LABEL: @test_various_types(
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; CHECK-NOT: llvm.is.constant
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%v1 = call i1 @llvm.is.constant.i256(i256 %int)
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%v2 = call i1 @llvm.is.constant.f32(float %float)
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%v3 = call i1 @llvm.is.constant.v2i64(<2 x i64> %vec)
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%v4 = call i1 @llvm.is.constant.sl_i32i32s({i32, i32} %struct)
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%v5 = call i1 @llvm.is.constant.a2i64([2 x i64] %arr)
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%v6 = call i1 @llvm.is.constant.p0i64(i64* %ptr)
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%c1 = call i1 @llvm.is.constant.i256(i256 -1)
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%c2 = call i1 @llvm.is.constant.f32(float 17.0)
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%c3 = call i1 @llvm.is.constant.v2i64(<2 x i64> <i64 -1, i64 44>)
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%c4 = call i1 @llvm.is.constant.sl_i32i32s({i32, i32} {i32 -1, i32 32})
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%c5 = call i1 @llvm.is.constant.a2i64([2 x i64] [i64 -1, i64 32])
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%c6 = call i1 @llvm.is.constant.p0i64(i64* inttoptr (i32 42 to i64*))
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%x1 = add i1 %v1, %c1
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%x2 = add i1 %v2, %c2
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%x3 = add i1 %v3, %c3
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%x4 = add i1 %v4, %c4
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%x5 = add i1 %v5, %c5
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%x6 = add i1 %v6, %c6
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%res2 = add i1 %x1, %x2
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%res3 = add i1 %res2, %x3
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%res4 = add i1 %res3, %x4
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%res5 = add i1 %res4, %x5
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%res6 = add i1 %res5, %x6
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ret i1 %res6
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}
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