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3ed0cd3cb6
These are not individual bug fixes. I had to rewrite a good chunk of the unroller to make it sane. I think it was getting lucky on trivial completely unrolled loops with no early exits. I included some fairly simple unit tests for partial unrolling. I didn't do much stress testing, so it may not be perfect, but should be usable now. llvm-svn: 137190
63 lines
2.4 KiB
LLVM
63 lines
2.4 KiB
LLVM
; RUN: opt -S < %s -instcombine -inline -jump-threading -loop-unroll -unroll-count=4 | FileCheck %s
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;
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; This is a test case that required a number of setup passes because
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; it depends on block order.
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target datalayout = "e-p:64:64:64-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-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.6.8"
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declare i1 @check() nounwind
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declare i32 @getval() nounwind
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; Check that the loop exit merges values from all the iterations. This
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; could be a tad fragile, but it's a good test.
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;
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; CHECK: @foo
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; CHECK: return:
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; CHECK: %retval.0 = phi i32 [ %tmp7.i, %land.lhs.true ], [ 0, %do.cond ], [ %tmp7.i.1, %land.lhs.true.1 ], [ 0, %do.cond.1 ], [ %tmp7.i.2, %land.lhs.true.2 ], [ 0, %do.cond.2 ], [ %tmp7.i.3, %land.lhs.true.3 ], [ 0, %do.cond.3 ]
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; CHECK-NOT: @bar
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; CHECK: bar.exit.3
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define i32 @foo() uwtable ssp align 2 {
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entry:
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br i1 undef, label %return, label %if.end
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if.end: ; preds = %entry
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%call2 = call i32 @getval()
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br label %do.body
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do.body: ; preds = %do.cond, %if.end
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%call6 = call i32 @bar()
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%cmp = icmp ne i32 %call6, 0
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br i1 %cmp, label %land.lhs.true, label %do.cond
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land.lhs.true: ; preds = %do.body
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%call10 = call i32 @getval()
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%cmp11 = icmp eq i32 0, %call10
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br i1 %cmp11, label %return, label %do.cond
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do.cond: ; preds = %land.lhs.true, %do.body
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%cmp18 = icmp sle i32 0, %call2
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br i1 %cmp18, label %do.body, label %return
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return: ; preds = %do.cond, %land.lhs.true, %entry
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%retval.0 = phi i32 [ 0, %entry ], [ %call6, %land.lhs.true ], [ 0, %do.cond ]
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ret i32 %retval.0
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}
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define linkonce_odr i32 @bar() nounwind uwtable ssp align 2 {
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entry:
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br i1 undef, label %land.lhs.true, label %cond.end
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land.lhs.true: ; preds = %entry
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%cmp4 = call zeroext i1 @check()
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br i1 %cmp4, label %cond.true, label %cond.end
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cond.true: ; preds = %land.lhs.true
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%tmp7 = call i32 @getval()
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br label %cond.end
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cond.end: ; preds = %cond.true, %land.lhs.true, %entry
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%cond = phi i32 [ %tmp7, %cond.true ], [ 0, %land.lhs.true ], [ 0, %entry ]
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ret i32 %cond
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}
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