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Better test case found in duplicate PR10570.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145484 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-11-30 06:26:42 +00:00
parent 316cd2a2c5
commit 68d1efc616
1 changed files with 20 additions and 40 deletions
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60
test/Transforms/LoopStrengthReduce/2011-11-29-postincphi.ll
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@ -1,8 +1,8 @@
; RUN: llc < %s | FileCheck %s
;
; PR11431: handle a phi operand that is replaced by a postinc user.
; LSR first expands %mul to %iv1 in %phi32
; LSR then expands %iv1 in %phi32 into two decrements, one on each loop exit.
; LSR first expands %t3 to %t2 in %phi
; LSR then expands %t2 in %phi into two decrements, one on each loop exit.
target datalayout = "e-p:64:64:64-S128-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-f128:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
@ -11,46 +11,26 @@ declare i1 @check() nounwind
; Check that LSR did something close to the behavior at the time of the bug.
; CHECK: @sqlite3DropTriggerPtr
; CHECK: addq $48, %rax
; CHECK: je
; CHECK: addq $-48, %rax
; CHECK: incq %rax
; CHECK: jne
; CHECK: decq %rax
; CHECK: ret
define i64 @sqlite3DropTriggerPtr() {
entry:
%cmp0 = call zeroext i1 @check()
br i1 %cmp0, label %"8", label %"3"
define i64 @sqlite3DropTriggerPtr() nounwind {
bb:
%cmp = call zeroext i1 @check()
br label %bb1
"3": ; preds = %entry
br i1 %cmp0, label %"4", label %"8"
bb1: ; preds = %bb4, %bb
%t0 = phi i64 [ 0, %bb ], [ %t3, %bb4 ]
%t2 = phi i64 [ 1, %bb ], [ %t5, %bb4 ]
%t3 = add nsw i64 %t0, 1
br i1 %cmp, label %bb4, label %bb8
"4": ; preds = %"3"
br i1 %cmp0, label %"8", label %"5.preheader"
bb4: ; preds = %bb1
%t5 = add nsw i64 %t2, 1
br i1 %cmp, label %bb1, label %bb8
"5.preheader": ; preds = %"4"
br label %"5"
"5":
%iv0 = phi i32 [ %iv0.inc, %"6" ], [ 0, %"5.preheader" ]
%iv1 = phi i64 [ %iv1.inc, %"6" ], [ 48, %"5.preheader" ]
%iv0.inc = add nsw i32 %iv0, 1
%cmp = icmp eq i32 %iv0.inc, 0
br i1 %cmp, label %"7", label %"6"
"6":
%iv1.inc = add i64 %iv1, 48
%iv1.ofs = add i64 %iv1, 40
%ptr8 = getelementptr inbounds i8* undef, i64 %iv1.ofs
%ptr32 = bitcast i8* %ptr8 to i32**
%v = load i32** %ptr32, align 8
br i1 %cmp0, label %"8", label %"5"
"7":
%iv.inc64 = sext i32 %iv0.inc to i64
%mul = mul i64 %iv.inc64, 48
br label %"8"
"8": ; preds = %"7", %"5", %"4", %"3", %entry
%phi32 = phi i32 [ %iv0.inc, %"7" ], [ 0, %"4" ], [ 0, %"3" ], [ -1000000, %entry ], [ %iv0.inc, %"6" ]
%phi64 = phi i64 [ %mul, %"7" ], [ 0, %"4" ], [ 0, %"3" ], [ -48000000, %entry ], [ %iv1, %"6" ]
ret i64 %phi64
bb8: ; preds = %bb8, %bb4
%phi = phi i64 [ %t3, %bb1 ], [ %t2, %bb4 ]
ret i64 %phi
}