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Diffstat (limited to 'test/CodeGen/X86/change-compare-stride-trickiness-1.ll')
-rw-r--r-- | test/CodeGen/X86/change-compare-stride-trickiness-1.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/CodeGen/X86/change-compare-stride-trickiness-1.ll b/test/CodeGen/X86/change-compare-stride-trickiness-1.ll new file mode 100644 index 0000000000..cb638092ea --- /dev/null +++ b/test/CodeGen/X86/change-compare-stride-trickiness-1.ll @@ -0,0 +1,28 @@ +; RUN: llc %s -o - --x86-asm-syntax=att | grep {cmp. \$10} +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" +target triple = "x86_64-apple-darwin9" + +; The comparison happens after the relevant use, so the stride can easily +; be changed. The comparison can be done in a narrower mode than the +; induction variable. +; TODO: By making the first store post-increment as well, the loop setup +; could be made simpler. + +define void @foo() nounwind { +entry: + br label %loop + +loop: + %indvar = phi i32 [ 0, %entry ], [ %i.2.0.us1534, %loop ] ; <i32> [#uses=1] + %i.2.0.us1534 = add i32 %indvar, 1 ; <i32> [#uses=3] + %tmp628.us1540 = shl i32 %i.2.0.us1534, 1 ; <i32> [#uses=1] + %tmp645646647.us1547 = sext i32 %tmp628.us1540 to i64 ; <i64> [#uses=1] + store i64 %tmp645646647.us1547, i64* null + %tmp611.us1535 = icmp eq i32 %i.2.0.us1534, 4 ; <i1> [#uses=2] + %tmp623.us1538 = select i1 %tmp611.us1535, i32 6, i32 0 ; <i32> [#uses=1] + store i32 %tmp623.us1538, i32* null + br i1 %tmp611.us1535, label %exit, label %loop + +exit: + ret void +} |