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If header of inner loop is aligned, do not align the outer loop header. We don't want to add nops in the outer loop for the sake of aligning the inner loop.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71609 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-05-12 23:58:14 +00:00
parent eca24fba3f
commit 9d3094b38e
2 changed files with 78 additions and 6 deletions
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45
test/CodeGen/X86/avoid-loop-align-2.ll Normal file
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; RUN: llvm-as < %s | llc -march=x86 | grep align | count 3
@x = external global i32* ; <i32**> [#uses=1]
define i32 @t(i32 %a, i32 %b) nounwind readonly ssp {
entry:
%0 = icmp eq i32 %a, 0 ; <i1> [#uses=1]
br i1 %0, label %bb5, label %bb.nph12
bb.nph12: ; preds = %entry
%1 = icmp eq i32 %b, 0 ; <i1> [#uses=1]
%2 = load i32** @x, align 8 ; <i32*> [#uses=1]
br i1 %1, label %bb2.preheader, label %bb2.preheader.us
bb2.preheader.us: ; preds = %bb2.bb3_crit_edge.us, %bb.nph12
%indvar18 = phi i32 [ 0, %bb.nph12 ], [ %indvar.next19, %bb2.bb3_crit_edge.us ] ; <i32> [#uses=2]
%sum.111.us = phi i32 [ 0, %bb.nph12 ], [ %4, %bb2.bb3_crit_edge.us ] ; <i32> [#uses=0]
%tmp16 = mul i32 %indvar18, %a ; <i32> [#uses=1]
br label %bb1.us
bb1.us: ; preds = %bb1.us, %bb2.preheader.us
%indvar = phi i32 [ 0, %bb2.preheader.us ], [ %indvar.next, %bb1.us ] ; <i32> [#uses=2]
%tmp17 = add i32 %indvar, %tmp16 ; <i32> [#uses=1]
%tmp. = zext i32 %tmp17 to i64 ; <i64> [#uses=1]
%3 = getelementptr i32* %2, i64 %tmp. ; <i32*> [#uses=1]
%4 = load i32* %3, align 4 ; <i32> [#uses=2]
%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2]
%exitcond = icmp eq i32 %indvar.next, %b ; <i1> [#uses=1]
br i1 %exitcond, label %bb2.bb3_crit_edge.us, label %bb1.us
bb2.bb3_crit_edge.us: ; preds = %bb1.us
%indvar.next19 = add i32 %indvar18, 1 ; <i32> [#uses=2]
%exitcond22 = icmp eq i32 %indvar.next19, %a ; <i1> [#uses=1]
br i1 %exitcond22, label %bb5, label %bb2.preheader.us
bb2.preheader: ; preds = %bb2.preheader, %bb.nph12
%indvar24 = phi i32 [ %indvar.next25, %bb2.preheader ], [ 0, %bb.nph12 ] ; <i32> [#uses=1]
%indvar.next25 = add i32 %indvar24, 1 ; <i32> [#uses=2]
%exitcond28 = icmp eq i32 %indvar.next25, %a ; <i1> [#uses=1]
br i1 %exitcond28, label %bb5, label %bb2.preheader
bb5: ; preds = %bb2.preheader, %bb2.bb3_crit_edge.us, %entry
%sum.1.lcssa = phi i32 [ 0, %entry ], [ 0, %bb2.preheader ], [ %4, %bb2.bb3_crit_edge.us ] ; <i32> [#uses=1]
ret i32 %sum.1.lcssa
}