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495950222a
First step after e1133179587dd895962a2fe4d6eb0cb1e63b5ee2, in these tests, DomTree is valid afterwards, so mark them as such, so that they don't regress. In further steps, SimplifyCFG transforms shall taught to preserve DomTree, in as small steps as possible.
65 lines
2.0 KiB
LLVM
65 lines
2.0 KiB
LLVM
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
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; Skip simplifying unconditional branches from empty blocks in simplifyCFG,
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; when it can destroy canonical loop structure.
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; void foo();
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; bool test(int a, int b, int *c) {
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; bool changed = false;
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; for (unsigned int i = 2; i--;) {
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; int r = a | b;
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; if ( r != c[i]) {
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; c[i] = r;
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; foo();
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; changed = true;
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; }
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; }
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; return changed;
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; }
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; CHECK-LABEL: @test(
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; CHECK: for.cond:
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; CHECK-NEXT: %i.0 = phi i32 [ 2, %entry ], [ %dec, %if.end ]
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; CHECK: for.body:
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; CHECK: br i1 %cmp, label %if.end, label %if.then
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; CHECK-NOT: br i1 %cmp, label %for.cond, label %if.then
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; CHECK: if.then:
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; CHECK: br label %if.end
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; CHECK-NOT: br label %for.cond
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; CHECK: if.end:
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; CHECK: br label %for.cond
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define i1 @test(i32 %a, i32 %b, i32* %c) {
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entry:
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br label %for.cond
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for.cond: ; preds = %if.end, %entry
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%i.0 = phi i32 [ 2, %entry ], [ %dec, %if.end ]
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%changed.0.off0 = phi i1 [ false, %entry ], [ %changed.1.off0, %if.end ]
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%dec = add nsw i32 %i.0, -1
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%tobool = icmp eq i32 %i.0, 0
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br i1 %tobool, label %for.cond.cleanup, label %for.body
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for.cond.cleanup: ; preds = %for.cond
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%changed.0.off0.lcssa = phi i1 [ %changed.0.off0, %for.cond ]
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ret i1 %changed.0.off0.lcssa
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for.body: ; preds = %for.cond
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%or = or i32 %a, %b
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%idxprom = sext i32 %dec to i64
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%arrayidx = getelementptr inbounds i32, i32* %c, i64 %idxprom
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%0 = load i32, i32* %arrayidx, align 4
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%cmp = icmp eq i32 %or, %0
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br i1 %cmp, label %if.end, label %if.then
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if.then: ; preds = %for.body
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store i32 %or, i32* %arrayidx, align 4
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call void @foo()
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br label %if.end
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if.end: ; preds = %for.body, %if.then
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%changed.1.off0 = phi i1 [ true, %if.then ], [ %changed.0.off0, %for.body ]
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br label %for.cond
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}
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declare void @foo()
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