98 lines
3.0 KiB
LLVM
98 lines
3.0 KiB
LLVM
; RUN: opt < %s -simplifycfg -phi-node-folding-threshold=2 -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @test1(i32 %a, i32 %b, i32 %c) nounwind {
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; CHECK-LABEL: @test1(
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entry:
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%tmp1 = icmp eq i32 %b, 0
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br i1 %tmp1, label %bb1, label %bb3
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bb1: ; preds = %entry
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%tmp2 = icmp sgt i32 %c, 1
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br i1 %tmp2, label %bb2, label %bb3
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; CHECK: bb1:
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; CHECK-NEXT: icmp sgt i32 %c, 1
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; CHECK-NEXT: add i32 %a, 1
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; CHECK-NEXT: select i1 %tmp2, i32 %tmp3, i32 %a
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; CHECK-NEXT: br label %bb3
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bb2: ; preds = bb1
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%tmp3 = add i32 %a, 1
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br label %bb3
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bb3: ; preds = %bb2, %entry
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%tmp4 = phi i32 [ %b, %entry ], [ %a, %bb1 ], [ %tmp3, %bb2 ]
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%tmp5 = sub i32 %tmp4, 1
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ret i32 %tmp5
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}
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define i8* @test4(i1* %dummy, i8* %a, i8* %b) {
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; Test that we don't speculate an arbitrarily large number of unfolded constant
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; expressions.
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; CHECK-LABEL: @test4(
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entry:
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%cond1 = load volatile i1, i1* %dummy
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br i1 %cond1, label %if, label %end
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if:
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%cond2 = load volatile i1, i1* %dummy
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br i1 %cond2, label %then, label %end
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then:
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br label %end
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end:
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%x1 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 1 to i8*), %then ]
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%x2 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 2 to i8*), %then ]
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%x3 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 3 to i8*), %then ]
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%x4 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 4 to i8*), %then ]
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%x5 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 5 to i8*), %then ]
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%x6 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 6 to i8*), %then ]
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%x7 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 7 to i8*), %then ]
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%x8 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 8 to i8*), %then ]
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%x9 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 9 to i8*), %then ]
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%x10 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 10 to i8*), %then ]
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; CHECK-NOT: select
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; CHECK: phi i8*
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; CHECK: phi i8*
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; CHECK: phi i8*
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; CHECK: phi i8*
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; CHECK: phi i8*
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; CHECK: phi i8*
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; CHECK: phi i8*
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; CHECK: phi i8*
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; CHECK: phi i8*
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; CHECK: phi i8*
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ret i8* %x10
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}
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define i32* @test5(i32 %a, i32 %b, i32 %c, i32* dereferenceable(10) %ptr1,
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i32* dereferenceable(10) %ptr2, i32** dereferenceable(10) %ptr3) nounwind {
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; CHECK-LABEL: @test5(
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entry:
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%tmp1 = icmp eq i32 %b, 0
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br i1 %tmp1, label %bb1, label %bb3
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bb1: ; preds = %entry
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%tmp2 = icmp sgt i32 %c, 1
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br i1 %tmp2, label %bb2, label %bb3
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; CHECK: bb1:
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; CHECK-NEXT: icmp sgt i32 %c, 1
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; CHECK-NEXT: load i32*, i32** %ptr3
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; CHECK-NOT: dereferenceable
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; CHECK-NEXT: select i1 %tmp2, i32* %tmp3, i32* %ptr2
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; CHECK-NEXT: ret i32* %tmp3.ptr2
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bb2: ; preds = bb1
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%tmp3 = load i32*, i32** %ptr3, !dereferenceable !{i64 10}
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br label %bb3
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bb3: ; preds = %bb2, %entry
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%tmp4 = phi i32* [ %ptr1, %entry ], [ %ptr2, %bb1 ], [ %tmp3, %bb2 ]
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ret i32* %tmp4
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}
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