; RUN: llc < %s -march=x86-64 | grep lea | count 13 ; This testcase was written to demonstrate an instruction-selection problem, ; however it also happens to expose a limitation in the DAGCombiner's ; expression reassociation which causes it to miss opportunities for ; constant folding due to the intermediate adds having multiple uses. ; The Reassociate pass has similar limitations. If these limitations are ; fixed, the test commands above will need to be updated to expect fewer ; lea instructions. @g0 = weak global [1000 x i32] zeroinitializer, align 32 ; <[1000 x i32]*> [#uses=8] @g1 = weak global [1000 x i32] zeroinitializer, align 32 ; <[1000 x i32]*> [#uses=7] define void @foo() { entry: %tmp4 = load i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 0) ; [#uses=1] %tmp8 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 0) ; [#uses=1] %tmp9 = add i32 %tmp4, 1 ; [#uses=1] %tmp10 = add i32 %tmp9, %tmp8 ; [#uses=2] store i32 %tmp10, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 1) %tmp8.1 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 1) ; [#uses=1] %tmp9.1 = add i32 %tmp10, 1 ; [#uses=1] %tmp10.1 = add i32 %tmp9.1, %tmp8.1 ; [#uses=2] store i32 %tmp10.1, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 2) %tmp8.2 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 2) ; [#uses=1] %tmp9.2 = add i32 %tmp10.1, 1 ; [#uses=1] %tmp10.2 = add i32 %tmp9.2, %tmp8.2 ; [#uses=2] store i32 %tmp10.2, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 3) %tmp8.3 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 3) ; [#uses=1] %tmp9.3 = add i32 %tmp10.2, 1 ; [#uses=1] %tmp10.3 = add i32 %tmp9.3, %tmp8.3 ; [#uses=2] store i32 %tmp10.3, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 4) %tmp8.4 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 4) ; [#uses=1] %tmp9.4 = add i32 %tmp10.3, 1 ; [#uses=1] %tmp10.4 = add i32 %tmp9.4, %tmp8.4 ; [#uses=2] store i32 %tmp10.4, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 5) %tmp8.5 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 5) ; [#uses=1] %tmp9.5 = add i32 %tmp10.4, 1 ; [#uses=1] %tmp10.5 = add i32 %tmp9.5, %tmp8.5 ; [#uses=2] store i32 %tmp10.5, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 6) %tmp8.6 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 6) ; [#uses=1] %tmp9.6 = add i32 %tmp10.5, 1 ; [#uses=1] %tmp10.6 = add i32 %tmp9.6, %tmp8.6 ; [#uses=1] store i32 %tmp10.6, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 7) ret void }