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llvm-project/llvm/test/Transforms/LoopUnroll/2011-08-09-PhiUpdate.ll

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Fix the LoopUnroller to handle nontrivial loops and partial unrolling. 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
2011-08-10 08:28:10 +08:00
; RUN: opt -S < %s -instcombine -inline -jump-threading -loop-unroll -unroll-count=4 | FileCheck %s
;
; This is a test case that required a number of setup passes because
; it depends on block order.
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"
target triple = "x86_64-apple-macosx10.6.8"
declare i1 @check() nounwind
declare i32 @getval() nounwind
; Check that the loop exit merges values from all the iterations. This
; could be a tad fragile, but it's a good test.
;
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @foo(
Fix the LoopUnroller to handle nontrivial loops and partial unrolling. 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
2011-08-10 08:28:10 +08:00
; CHECK: return:
; 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 ]
Fixup to r186268 and r186269: don't append -LABEL to CHECK-NOT. No functionality change. llvm-svn: 186271
2013-07-14 10:10:57 +08:00
; CHECK-NOT: @bar(
Fix the LoopUnroller to handle nontrivial loops and partial unrolling. 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
2011-08-10 08:28:10 +08:00
; CHECK: bar.exit.3
define i32 @foo() uwtable ssp align 2 {
entry:
br i1 undef, label %return, label %if.end
if.end: ; preds = %entry
%call2 = call i32 @getval()
br label %do.body
do.body: ; preds = %do.cond, %if.end
%call6 = call i32 @bar()
%cmp = icmp ne i32 %call6, 0
br i1 %cmp, label %land.lhs.true, label %do.cond
land.lhs.true: ; preds = %do.body
%call10 = call i32 @getval()
%cmp11 = icmp eq i32 0, %call10
br i1 %cmp11, label %return, label %do.cond
do.cond: ; preds = %land.lhs.true, %do.body
%cmp18 = icmp sle i32 0, %call2
br i1 %cmp18, label %do.body, label %return
return: ; preds = %do.cond, %land.lhs.true, %entry
%retval.0 = phi i32 [ 0, %entry ], [ %call6, %land.lhs.true ], [ 0, %do.cond ]
ret i32 %retval.0
}
define linkonce_odr i32 @bar() nounwind uwtable ssp align 2 {
entry:
br i1 undef, label %land.lhs.true, label %cond.end
land.lhs.true: ; preds = %entry
%cmp4 = call zeroext i1 @check()
br i1 %cmp4, label %cond.true, label %cond.end
cond.true: ; preds = %land.lhs.true
%tmp7 = call i32 @getval()
br label %cond.end
cond.end: ; preds = %cond.true, %land.lhs.true, %entry
%cond = phi i32 [ %tmp7, %cond.true ], [ 0, %land.lhs.true ], [ 0, %entry ]
ret i32 %cond
}