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Diffstat (limited to 'test/CodeGen/ARM/arm-negative-stride.ll')
| -rw-r--r-- | test/CodeGen/ARM/arm-negative-stride.ll | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/arm-negative-stride.ll b/test/CodeGen/ARM/arm-negative-stride.ll index 72ec8ef..52ab871 100644 --- a/test/CodeGen/ARM/arm-negative-stride.ll +++ b/test/CodeGen/ARM/arm-negative-stride.ll @@ -1,7 +1,32 @@ ; RUN: llc < %s -march=arm | FileCheck %s +; This loop is rewritten with an indvar which counts down, which +; frees up a register from holding the trip count. + define void @test(i32* %P, i32 %A, i32 %i) nounwind { entry: +; CHECK: str r1, [{{r.*}}, +{{r.*}}, lsl #2] + icmp eq i32 %i, 0 ; <i1>:0 [#uses=1] + br i1 %0, label %return, label %bb + +bb: ; preds = %bb, %entry + %indvar = phi i32 [ 0, %entry ], [ %indvar.next, %bb ] ; <i32> [#uses=2] + %i_addr.09.0 = sub i32 %i, %indvar ; <i32> [#uses=1] + %tmp2 = getelementptr i32* %P, i32 %i_addr.09.0 ; <i32*> [#uses=1] + store i32 %A, i32* %tmp2 + %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2] + icmp eq i32 %indvar.next, %i ; <i1>:1 [#uses=1] + br i1 %1, label %return, label %bb + +return: ; preds = %bb, %entry + ret void +} + +; This loop has a non-address use of the count-up indvar, so +; it'll remain. Now the original store uses a negative-stride address. + +define void @test_with_forced_iv(i32* %P, i32 %A, i32 %i) nounwind { +entry: ; CHECK: str r1, [{{r.*}}, -{{r.*}}, lsl #2] icmp eq i32 %i, 0 ; <i1>:0 [#uses=1] br i1 %0, label %return, label %bb @@ -11,6 +36,7 @@ bb: ; preds = %bb, %entry %i_addr.09.0 = sub i32 %i, %indvar ; <i32> [#uses=1] %tmp2 = getelementptr i32* %P, i32 %i_addr.09.0 ; <i32*> [#uses=1] store i32 %A, i32* %tmp2 + store i32 %indvar, i32* null %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2] icmp eq i32 %indvar.next, %i ; <i1>:1 [#uses=1] br i1 %1, label %return, label %bb |