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llvm-6502/test/Transforms/IndVarSimplify/iv-widen.ll

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indvars: insert truncate at loop boundary to avoid redundant IVs. When widening an IV to remove s/zext, we generally try to eliminate the original narrow IV. However, LCSSA phi nodes outside the loop were still using the original IV. Clean this up more aggressively to avoid redundancy in generated code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198338 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-02 19:29:38 +00:00
; RUN: opt < %s -indvars -S | FileCheck %s
target triple = "x86_64-apple-darwin"
; CHECK-LABEL: @sloop
; CHECK-LABEL: B18:
; Only one phi now.
; CHECK: phi
; CHECK-NOT: phi
Reapply r198654 "indvars: sink truncates outside the loop." This doesn't seem to have actually broken anything. It was paranoia on my part. Trying again now that bots are more stable. This is a follow up of the r198338 commit that added truncates for lcssa phi nodes. Sinking the truncates below the phis cleans up the loop and simplifies subsequent analysis within the indvars pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198678 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-07 06:59:12 +00:00
; One trunc for the gep.
indvars: insert truncate at loop boundary to avoid redundant IVs. When widening an IV to remove s/zext, we generally try to eliminate the original narrow IV. However, LCSSA phi nodes outside the loop were still using the original IV. Clean this up more aggressively to avoid redundancy in generated code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198338 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-02 19:29:38 +00:00
; CHECK: trunc i64 %indvars.iv to i32
Reapply r198654 "indvars: sink truncates outside the loop." This doesn't seem to have actually broken anything. It was paranoia on my part. Trying again now that bots are more stable. This is a follow up of the r198338 commit that added truncates for lcssa phi nodes. Sinking the truncates below the phis cleans up the loop and simplifies subsequent analysis within the indvars pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198678 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-07 06:59:12 +00:00
; One trunc for the dummy() call.
; CHECK-LABEL: exit24:
; CHECK: trunc i64 {{.*}}lcssa.wide to i32
indvars: insert truncate at loop boundary to avoid redundant IVs. When widening an IV to remove s/zext, we generally try to eliminate the original narrow IV. However, LCSSA phi nodes outside the loop were still using the original IV. Clean this up more aggressively to avoid redundancy in generated code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198338 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-02 19:29:38 +00:00
define void @sloop(i32* %a) {
Prologue:
br i1 undef, label %B18, label %B6
B18: ; preds = %B24, %Prologue
%.02 = phi i32 [ 0, %Prologue ], [ %tmp33, %B24 ]
%tmp23 = zext i32 %.02 to i64
%tmp33 = add i32 %.02, 1
%o = getelementptr i32* %a, i32 %.02
%v = load i32* %o
%t = icmp eq i32 %v, 0
br i1 %t, label %exit24, label %B24
B24: ; preds = %B18
%t2 = icmp eq i32 %tmp33, 20
br i1 %t2, label %B6, label %B18
B6: ; preds = %Prologue
ret void
exit24: ; preds = %B18
call void @dummy(i32 %.02)
unreachable
}
declare void @dummy(i32)
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