mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-26 21:32:10 +00:00
1cbae18cf6
logic by David Meyer revealed this bug. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140992 91177308-0d34-0410-b5e6-96231b3b80d8
101 lines
3.4 KiB
LLVM
101 lines
3.4 KiB
LLVM
; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
|
|
|
|
; ScalarEvolution should be able to understand the loop and eliminate the casts.
|
|
|
|
; CHECK: {%d,+,sizeof(i32)}
|
|
|
|
define void @foo(i32* nocapture %d, i32 %n) nounwind {
|
|
entry:
|
|
%0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
|
|
br i1 %0, label %bb.nph, label %return
|
|
|
|
bb.nph: ; preds = %entry
|
|
br label %bb
|
|
|
|
bb: ; preds = %bb1, %bb.nph
|
|
%i.02 = phi i32 [ %5, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=2]
|
|
%p.01 = phi i8 [ %4, %bb1 ], [ -1, %bb.nph ] ; <i8> [#uses=2]
|
|
%1 = sext i8 %p.01 to i32 ; <i32> [#uses=1]
|
|
%2 = sext i32 %i.02 to i64 ; <i64> [#uses=1]
|
|
%3 = getelementptr i32* %d, i64 %2 ; <i32*> [#uses=1]
|
|
store i32 %1, i32* %3, align 4
|
|
%4 = add i8 %p.01, 1 ; <i8> [#uses=1]
|
|
%5 = add i32 %i.02, 1 ; <i32> [#uses=2]
|
|
br label %bb1
|
|
|
|
bb1: ; preds = %bb
|
|
%6 = icmp slt i32 %5, %n ; <i1> [#uses=1]
|
|
br i1 %6, label %bb, label %bb1.return_crit_edge
|
|
|
|
bb1.return_crit_edge: ; preds = %bb1
|
|
br label %return
|
|
|
|
return: ; preds = %bb1.return_crit_edge, %entry
|
|
ret void
|
|
}
|
|
|
|
; ScalarEvolution should be able to find the maximum tripcount
|
|
; of this multiple-exit loop, and if it doesn't know the exact
|
|
; count, it should say so.
|
|
|
|
; PR7845
|
|
; CHECK: Loop %for.cond: <multiple exits> Unpredictable backedge-taken count.
|
|
; CHECK: Loop %for.cond: max backedge-taken count is 5
|
|
|
|
@.str = private constant [4 x i8] c"%d\0A\00" ; <[4 x i8]*> [#uses=2]
|
|
|
|
define i32 @main() nounwind {
|
|
entry:
|
|
br label %for.cond
|
|
|
|
for.cond: ; preds = %for.inc, %entry
|
|
%g_4.0 = phi i32 [ 0, %entry ], [ %add, %for.inc ] ; <i32> [#uses=5]
|
|
%cmp = icmp slt i32 %g_4.0, 5 ; <i1> [#uses=1]
|
|
br i1 %cmp, label %for.body, label %for.end
|
|
|
|
for.body: ; preds = %for.cond
|
|
%conv = trunc i32 %g_4.0 to i16 ; <i16> [#uses=1]
|
|
%tobool.not = icmp eq i16 %conv, 0 ; <i1> [#uses=1]
|
|
%tobool3 = icmp ne i32 %g_4.0, 0 ; <i1> [#uses=1]
|
|
%or.cond = and i1 %tobool.not, %tobool3 ; <i1> [#uses=1]
|
|
br i1 %or.cond, label %for.end, label %for.inc
|
|
|
|
for.inc: ; preds = %for.body
|
|
%add = add nsw i32 %g_4.0, 1 ; <i32> [#uses=1]
|
|
br label %for.cond
|
|
|
|
for.end: ; preds = %for.body, %for.cond
|
|
%call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i32 %g_4.0) nounwind ; <i32> [#uses=0]
|
|
ret i32 0
|
|
}
|
|
|
|
declare i32 @printf(i8*, ...)
|
|
|
|
define void @test(i8* %a, i32 %n) nounwind {
|
|
entry:
|
|
%cmp1 = icmp sgt i32 %n, 0
|
|
br i1 %cmp1, label %for.body.lr.ph, label %for.end
|
|
|
|
for.body.lr.ph: ; preds = %entry
|
|
%tmp = zext i32 %n to i64
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %for.body, %for.body.lr.ph
|
|
%indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %for.body.lr.ph ]
|
|
%arrayidx = getelementptr i8* %a, i64 %indvar
|
|
store i8 0, i8* %arrayidx, align 1
|
|
%indvar.next = add i64 %indvar, 1
|
|
%exitcond = icmp ne i64 %indvar.next, %tmp
|
|
br i1 %exitcond, label %for.body, label %for.cond.for.end_crit_edge
|
|
|
|
for.cond.for.end_crit_edge: ; preds = %for.body
|
|
br label %for.end
|
|
|
|
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
|
|
ret void
|
|
}
|
|
|
|
; CHECK: Determining loop execution counts for: @test
|
|
; CHECK-NEXT: backedge-taken count is
|
|
; CHECK-NEXT: max backedge-taken count is -1
|