1 ; RUN: opt < %s -basicaa -gvn -S | grep {DEAD = phi i32 } 2 3 ; GVN should eliminate the fully redundant %9 GEP which 4 ; allows DEAD to be removed. This is PR3198. 5 6 ; The %7 and %4 loads combine to make %DEAD unneeded. 7 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" 8 target triple = "i386-apple-darwin7" 9 @H = common global [100 x i32] zeroinitializer, align 32 ; <[100 x i32]*> [#uses=3] 10 @G = common global i32 0 ; <i32*> [#uses=2] 11 12 define i32 @test(i32 %i) nounwind { 13 entry: 14 %0 = tail call i32 (...)* @foo() nounwind ; <i32> [#uses=1] 15 %1 = icmp eq i32 %0, 0 ; <i1> [#uses=1] 16 br i1 %1, label %bb1, label %bb 17 18 bb: ; preds = %entry 19 %2 = tail call i32 (...)* @bar() nounwind ; <i32> [#uses=0] 20 %3 = getelementptr [100 x i32]* @H, i32 0, i32 %i ; <i32*> [#uses=1] 21 %4 = load i32* %3, align 4 ; <i32> [#uses=1] 22 store i32 %4, i32* @G, align 4 23 br label %bb3 24 25 bb1: ; preds = %entry 26 %5 = tail call i32 (...)* @baz() nounwind ; <i32> [#uses=0] 27 %6 = getelementptr [100 x i32]* @H, i32 0, i32 %i ; <i32*> [#uses=1] 28 %7 = load i32* %6, align 4 ; <i32> [#uses=2] 29 store i32 %7, i32* @G, align 4 30 %8 = icmp eq i32 %7, 0 ; <i1> [#uses=1] 31 br i1 %8, label %bb3, label %bb4 32 33 bb3: ; preds = %bb1, %bb 34 %9 = getelementptr [100 x i32]* @H, i32 0, i32 %i ; <i32*> [#uses=1] 35 %DEAD = load i32* %9, align 4 ; <i32> [#uses=1] 36 ret i32 %DEAD 37 38 bb4: ; preds = %bb1 39 ret i32 0 40 } 41 42 declare i32 @foo(...) 43 44 declare i32 @bar(...) 45 46 declare i32 @baz(...) 47
