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llvm-6502/test/CodeGen/AArch64/combine-comparisons-by-cse.ll

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[AArch64] Add pass to enable additional comparison optimizations by CSE. Patched by Sergey Dmitrouk. This pass tries to make consecutive compares of values use same operands to allow CSE pass to remove duplicated instructions. For this it analyzes branches and adjusts comparisons with immediate values by converting: GE -> GT GT -> GE LT -> LE LE -> LT and adjusting immediate values appropriately. It basically corrects two immediate values towards each other to make them equal. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217220 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-05 02:55:24 +00:00
; RUN: llc < %s -march=aarch64 -mtriple=aarch64-linux-gnu | FileCheck %s
; marked as external to prevent possible optimizations
@a = external global i32
@b = external global i32
@c = external global i32
@d = external global i32
; (a > 10 && b == c) || (a >= 10 && b == d)
define i32 @combine_gt_ge_10() #0 {
; CHECK-LABEL: combine_gt_ge_10
; CHECK: cmp
; CHECK: b.le
; CHECK: ret
; CHECK-NOT: cmp
; CHECK: b.lt
entry:
%0 = load i32* @a, align 4
%cmp = icmp sgt i32 %0, 10
br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
land.lhs.true: ; preds = %entry
%1 = load i32* @b, align 4
%2 = load i32* @c, align 4
%cmp1 = icmp eq i32 %1, %2
br i1 %cmp1, label %return, label %land.lhs.true3
lor.lhs.false: ; preds = %entry
%cmp2 = icmp sgt i32 %0, 9
br i1 %cmp2, label %land.lhs.true3, label %if.end
land.lhs.true3: ; preds = %lor.lhs.false, %land.lhs.true
%3 = load i32* @b, align 4
%4 = load i32* @d, align 4
%cmp4 = icmp eq i32 %3, %4
br i1 %cmp4, label %return, label %if.end
if.end: ; preds = %land.lhs.true3, %lor.lhs.false
br label %return
return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
ret i32 %retval.0
}
; (a > 5 && b == c) || (a < 5 && b == d)
define i32 @combine_gt_lt_5() #0 {
; CHECK-LABEL: combine_gt_lt_5
; CHECK: cmp
; CHECK: b.le
; CHECK: ret
; CHECK-NOT: cmp
; CHECK: b.ge
entry:
%0 = load i32* @a, align 4
%cmp = icmp sgt i32 %0, 5
br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
land.lhs.true: ; preds = %entry
%1 = load i32* @b, align 4
%2 = load i32* @c, align 4
%cmp1 = icmp eq i32 %1, %2
br i1 %cmp1, label %return, label %if.end
lor.lhs.false: ; preds = %entry
%cmp2 = icmp slt i32 %0, 5
br i1 %cmp2, label %land.lhs.true3, label %if.end
land.lhs.true3: ; preds = %lor.lhs.false
%3 = load i32* @b, align 4
%4 = load i32* @d, align 4
%cmp4 = icmp eq i32 %3, %4
br i1 %cmp4, label %return, label %if.end
if.end: ; preds = %land.lhs.true3, %lor.lhs.false, %land.lhs.true
br label %return
return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
ret i32 %retval.0
}
; (a < 5 && b == c) || (a <= 5 && b == d)
define i32 @combine_lt_ge_5() #0 {
; CHECK-LABEL: combine_lt_ge_5
; CHECK: cmp
; CHECK: b.ge
; CHECK: ret
; CHECK-NOT: cmp
; CHECK: b.gt
entry:
%0 = load i32* @a, align 4
%cmp = icmp slt i32 %0, 5
br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
land.lhs.true: ; preds = %entry
%1 = load i32* @b, align 4
%2 = load i32* @c, align 4
%cmp1 = icmp eq i32 %1, %2
br i1 %cmp1, label %return, label %land.lhs.true3
lor.lhs.false: ; preds = %entry
%cmp2 = icmp slt i32 %0, 6
br i1 %cmp2, label %land.lhs.true3, label %if.end
land.lhs.true3: ; preds = %lor.lhs.false, %land.lhs.true
%3 = load i32* @b, align 4
%4 = load i32* @d, align 4
%cmp4 = icmp eq i32 %3, %4
br i1 %cmp4, label %return, label %if.end
if.end: ; preds = %land.lhs.true3, %lor.lhs.false
br label %return
return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
ret i32 %retval.0
}
; (a < 5 && b == c) || (a > 5 && b == d)
define i32 @combine_lt_gt_5() #0 {
; CHECK-LABEL: combine_lt_gt_5
; CHECK: cmp
; CHECK: b.ge
; CHECK: ret
; CHECK-NOT: cmp
; CHECK: b.le
entry:
%0 = load i32* @a, align 4
%cmp = icmp slt i32 %0, 5
br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
land.lhs.true: ; preds = %entry
%1 = load i32* @b, align 4
%2 = load i32* @c, align 4
%cmp1 = icmp eq i32 %1, %2
br i1 %cmp1, label %return, label %if.end
lor.lhs.false: ; preds = %entry
%cmp2 = icmp sgt i32 %0, 5
br i1 %cmp2, label %land.lhs.true3, label %if.end
land.lhs.true3: ; preds = %lor.lhs.false
%3 = load i32* @b, align 4
%4 = load i32* @d, align 4
%cmp4 = icmp eq i32 %3, %4
br i1 %cmp4, label %return, label %if.end
if.end: ; preds = %land.lhs.true3, %lor.lhs.false, %land.lhs.true
br label %return
return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
ret i32 %retval.0
}
; (a > -5 && b == c) || (a < -5 && b == d)
define i32 @combine_gt_lt_n5() #0 {
; CHECK-LABEL: combine_gt_lt_n5
; CHECK: cmn
; CHECK: b.le
; CHECK: ret
; CHECK-NOT: cmn
; CHECK: b.ge
entry:
%0 = load i32* @a, align 4
%cmp = icmp sgt i32 %0, -5
br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
land.lhs.true: ; preds = %entry
%1 = load i32* @b, align 4
%2 = load i32* @c, align 4
%cmp1 = icmp eq i32 %1, %2
br i1 %cmp1, label %return, label %if.end
lor.lhs.false: ; preds = %entry
%cmp2 = icmp slt i32 %0, -5
br i1 %cmp2, label %land.lhs.true3, label %if.end
land.lhs.true3: ; preds = %lor.lhs.false
%3 = load i32* @b, align 4
%4 = load i32* @d, align 4
%cmp4 = icmp eq i32 %3, %4
br i1 %cmp4, label %return, label %if.end
if.end: ; preds = %land.lhs.true3, %lor.lhs.false, %land.lhs.true
br label %return
return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
ret i32 %retval.0
}
; (a < -5 && b == c) || (a > -5 && b == d)
define i32 @combine_lt_gt_n5() #0 {
; CHECK-LABEL: combine_lt_gt_n5
; CHECK: cmn
; CHECK: b.ge
; CHECK: ret
; CHECK-NOT: cmn
; CHECK: b.le
entry:
%0 = load i32* @a, align 4
%cmp = icmp slt i32 %0, -5
br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
land.lhs.true: ; preds = %entry
%1 = load i32* @b, align 4
%2 = load i32* @c, align 4
%cmp1 = icmp eq i32 %1, %2
br i1 %cmp1, label %return, label %if.end
lor.lhs.false: ; preds = %entry
%cmp2 = icmp sgt i32 %0, -5
br i1 %cmp2, label %land.lhs.true3, label %if.end
land.lhs.true3: ; preds = %lor.lhs.false
%3 = load i32* @b, align 4
%4 = load i32* @d, align 4
%cmp4 = icmp eq i32 %3, %4
br i1 %cmp4, label %return, label %if.end
if.end: ; preds = %land.lhs.true3, %lor.lhs.false, %land.lhs.true
br label %return
return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
ret i32 %retval.0
}
%struct.Struct = type { i64, i64 }
@glob = internal unnamed_addr global %struct.Struct* null, align 8
declare %struct.Struct* @Update(%struct.Struct*) #1
; no checks for this case, it just should be processed without errors
define void @combine_non_adjacent_cmp_br(%struct.Struct* nocapture readonly %hdCall) #0 {
entry:
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction One of several parallel first steps to remove the target type of pointers, replacing them with a single opaque pointer type. This adds an explicit type parameter to the gep instruction so that when the first parameter becomes an opaque pointer type, the type to gep through is still available to the instructions. * This doesn't modify gep operators, only instructions (operators will be handled separately) * Textual IR changes only. Bitcode (including upgrade) and changing the in-memory representation will be in separate changes. * geps of vectors are transformed as: getelementptr <4 x float*> %x, ... ->getelementptr float, <4 x float*> %x, ... Then, once the opaque pointer type is introduced, this will ultimately look like: getelementptr float, <4 x ptr> %x with the unambiguous interpretation that it is a vector of pointers to float. * address spaces remain on the pointer, not the type: getelementptr float addrspace(1)* %x ->getelementptr float, float addrspace(1)* %x Then, eventually: getelementptr float, ptr addrspace(1) %x Importantly, the massive amount of test case churn has been automated by same crappy python code. I had to manually update a few test cases that wouldn't fit the script's model (r228970,r229196,r229197,r229198). The python script just massages stdin and writes the result to stdout, I then wrapped that in a shell script to handle replacing files, then using the usual find+xargs to migrate all the files. update.py: import fileinput import sys import re ibrep = re.compile(r"(^.*?[^%\w]getelementptr inbounds )(((?:<\d* x )?)(.*?)(| addrspace\(\d\)) *\*(|>)(?:$| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$))") normrep = re.compile( r"(^.*?[^%\w]getelementptr )(((?:<\d* x )?)(.*?)(| addrspace\(\d\)) *\*(|>)(?:$| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$))") def conv(match, line): if not match: return line line = match.groups()[0] if len(match.groups()[5]) == 0: line += match.groups()[2] line += match.groups()[3] line += ", " line += match.groups()[1] line += "\n" return line for line in sys.stdin: if line.find("getelementptr ") == line.find("getelementptr inbounds"): if line.find("getelementptr inbounds") != line.find("getelementptr inbounds ("): line = conv(re.match(ibrep, line), line) elif line.find("getelementptr ") != line.find("getelementptr ("): line = conv(re.match(normrep, line), line) sys.stdout.write(line) apply.sh: for name in "$@" do python3 `dirname "$0"`/update.py < "$name" > "$name.tmp" && mv "$name.tmp" "$name" rm -f "$name.tmp" done The actual commands: From llvm/src: find test/ -name *.ll | xargs ./apply.sh From llvm/src/tools/clang: find test/ -name *.mm -o -name *.m -o -name *.cpp -o -name *.c | xargs -I '{}' ../../apply.sh "{}" From llvm/src/tools/polly: find test/ -name *.ll | xargs ./apply.sh After that, check-all (with llvm, clang, clang-tools-extra, lld, compiler-rt, and polly all checked out). The extra 'rm' in the apply.sh script is due to a few files in clang's test suite using interesting unicode stuff that my python script was throwing exceptions on. None of those files needed to be migrated, so it seemed sufficient to ignore those cases. Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7636 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230786 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-27 19:29:02 +00:00
%size = getelementptr inbounds %struct.Struct, %struct.Struct* %hdCall, i64 0, i32 0
[AArch64] Add pass to enable additional comparison optimizations by CSE. Patched by Sergey Dmitrouk. This pass tries to make consecutive compares of values use same operands to allow CSE pass to remove duplicated instructions. For this it analyzes branches and adjusts comparisons with immediate values by converting: GE -> GT GT -> GE LT -> LE LE -> LT and adjusting immediate values appropriately. It basically corrects two immediate values towards each other to make them equal. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217220 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-05 02:55:24 +00:00
%0 = load i64* %size, align 8
br label %land.rhs
land.rhs:
%rp.06 = phi i64 [ %0, %entry ], [ %sub, %while.body ]
%1 = load i64* inttoptr (i64 24 to i64*), align 8
%cmp2 = icmp sgt i64 %1, 0
br i1 %cmp2, label %while.body, label %while.end
while.body:
%2 = load %struct.Struct** @glob, align 8
%call = tail call %struct.Struct* @Update(%struct.Struct* %2) #2
%sub = add nsw i64 %rp.06, -2
%cmp = icmp slt i64 %0, %rp.06
br i1 %cmp, label %land.rhs, label %while.end
while.end:
ret void
}
; undefined external to prevent possible optimizations
declare void @do_something() #1
define i32 @do_nothing_if_resultant_opcodes_would_differ() #0 {
; CHECK-LABEL: do_nothing_if_resultant_opcodes_would_differ
; CHECK: cmn
; CHECK: b.gt
; CHECK: cmp
; CHECK: b.gt
entry:
%0 = load i32* @a, align 4
%cmp4 = icmp slt i32 %0, -1
br i1 %cmp4, label %while.body.preheader, label %while.end
while.body.preheader: ; preds = %entry
br label %while.body
while.body: ; preds = %while.body, %while.body.preheader
%i.05 = phi i32 [ %inc, %while.body ], [ %0, %while.body.preheader ]
tail call void @do_something() #2
%inc = add nsw i32 %i.05, 1
%cmp = icmp slt i32 %i.05, 0
br i1 %cmp, label %while.body, label %while.cond.while.end_crit_edge
while.cond.while.end_crit_edge: ; preds = %while.body
%.pre = load i32* @a, align 4
br label %while.end
while.end: ; preds = %while.cond.while.end_crit_edge, %entry
%1 = phi i32 [ %.pre, %while.cond.while.end_crit_edge ], [ %0, %entry ]
%cmp1 = icmp slt i32 %1, 2
br i1 %cmp1, label %land.lhs.true, label %if.end
land.lhs.true: ; preds = %while.end
%2 = load i32* @b, align 4
%3 = load i32* @d, align 4
%cmp2 = icmp eq i32 %2, %3
br i1 %cmp2, label %return, label %if.end
if.end: ; preds = %land.lhs.true, %while.end
br label %return
return: ; preds = %if.end, %land.lhs.true
%retval.0 = phi i32 [ 0, %if.end ], [ 123, %land.lhs.true ]
ret i32 %retval.0
}
define i32 @do_nothing_if_compares_can_not_be_adjusted_to_each_other() #0 {
; CHECK-LABEL: do_nothing_if_compares_can_not_be_adjusted_to_each_other
; CHECK: cmp
; CHECK: b.gt
; CHECK: cmn
; CHECK: b.lt
entry:
%0 = load i32* @a, align 4
%cmp4 = icmp slt i32 %0, 1
br i1 %cmp4, label %while.body.preheader, label %while.end
while.body.preheader: ; preds = %entry
br label %while.body
while.body: ; preds = %while.body, %while.body.preheader
%i.05 = phi i32 [ %inc, %while.body ], [ %0, %while.body.preheader ]
tail call void @do_something() #2
%inc = add nsw i32 %i.05, 1
%cmp = icmp slt i32 %i.05, 0
br i1 %cmp, label %while.body, label %while.end.loopexit
while.end.loopexit: ; preds = %while.body
br label %while.end
while.end: ; preds = %while.end.loopexit, %entry
%1 = load i32* @c, align 4
%cmp1 = icmp sgt i32 %1, -3
br i1 %cmp1, label %land.lhs.true, label %if.end
land.lhs.true: ; preds = %while.end
%2 = load i32* @b, align 4
%3 = load i32* @d, align 4
%cmp2 = icmp eq i32 %2, %3
br i1 %cmp2, label %return, label %if.end
if.end: ; preds = %land.lhs.true, %while.end
br label %return
return: ; preds = %if.end, %land.lhs.true
%retval.0 = phi i32 [ 0, %if.end ], [ 123, %land.lhs.true ]
ret i32 %retval.0
}
[AArch64] CondOpt pass is missing FCMP instructions when searching backward for a CMP which defines the flags used by B.CC. http://reviews.llvm.org/D6047 Patch by Zhaoshi Zheng <zhaoshiz@codeaurora.org>! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220961 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-31 15:17:36 +00:00
; Test in the following case, we don't hit 'cmp' and trigger a false positive
; cmp w19, #0
; cinc w0, w19, gt
; ...
; fcmp d8, #0.0
; b.gt .LBB0_5
define i32 @fcmpri(i32 %argc, i8** nocapture readonly %argv) {
; CHECK-LABEL: fcmpri:
; CHECK: cmp w0, #2
; CHECK: b.lt .LBB9_3
; CHECK-NOT: cmp w0, #1
; CHECK-NOT: b.le .LBB9_3
; CHECK-LABEL-DAG: .LBB9_3
; CHECK: cmp w19, #0
; CHECK: fcmp d8, #0.0
; CHECK-NOT: cmp w19, #1
; CHECK-NOT: b.ge .LBB9_5
entry:
%cmp = icmp sgt i32 %argc, 1
br i1 %cmp, label %land.lhs.true, label %if.end
land.lhs.true: ; preds = %entry
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction One of several parallel first steps to remove the target type of pointers, replacing them with a single opaque pointer type. This adds an explicit type parameter to the gep instruction so that when the first parameter becomes an opaque pointer type, the type to gep through is still available to the instructions. * This doesn't modify gep operators, only instructions (operators will be handled separately) * Textual IR changes only. Bitcode (including upgrade) and changing the in-memory representation will be in separate changes. * geps of vectors are transformed as: getelementptr <4 x float*> %x, ... ->getelementptr float, <4 x float*> %x, ... Then, once the opaque pointer type is introduced, this will ultimately look like: getelementptr float, <4 x ptr> %x with the unambiguous interpretation that it is a vector of pointers to float. * address spaces remain on the pointer, not the type: getelementptr float addrspace(1)* %x ->getelementptr float, float addrspace(1)* %x Then, eventually: getelementptr float, ptr addrspace(1) %x Importantly, the massive amount of test case churn has been automated by same crappy python code. I had to manually update a few test cases that wouldn't fit the script's model (r228970,r229196,r229197,r229198). The python script just massages stdin and writes the result to stdout, I then wrapped that in a shell script to handle replacing files, then using the usual find+xargs to migrate all the files. update.py: import fileinput import sys import re ibrep = re.compile(r"(^.*?[^%\w]getelementptr inbounds )(((?:<\d* x )?)(.*?)(| addrspace\(\d\)) *\*(|>)(?:$| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$))") normrep = re.compile( r"(^.*?[^%\w]getelementptr )(((?:<\d* x )?)(.*?)(| addrspace\(\d\)) *\*(|>)(?:$| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$))") def conv(match, line): if not match: return line line = match.groups()[0] if len(match.groups()[5]) == 0: line += match.groups()[2] line += match.groups()[3] line += ", " line += match.groups()[1] line += "\n" return line for line in sys.stdin: if line.find("getelementptr ") == line.find("getelementptr inbounds"): if line.find("getelementptr inbounds") != line.find("getelementptr inbounds ("): line = conv(re.match(ibrep, line), line) elif line.find("getelementptr ") != line.find("getelementptr ("): line = conv(re.match(normrep, line), line) sys.stdout.write(line) apply.sh: for name in "$@" do python3 `dirname "$0"`/update.py < "$name" > "$name.tmp" && mv "$name.tmp" "$name" rm -f "$name.tmp" done The actual commands: From llvm/src: find test/ -name *.ll | xargs ./apply.sh From llvm/src/tools/clang: find test/ -name *.mm -o -name *.m -o -name *.cpp -o -name *.c | xargs -I '{}' ../../apply.sh "{}" From llvm/src/tools/polly: find test/ -name *.ll | xargs ./apply.sh After that, check-all (with llvm, clang, clang-tools-extra, lld, compiler-rt, and polly all checked out). The extra 'rm' in the apply.sh script is due to a few files in clang's test suite using interesting unicode stuff that my python script was throwing exceptions on. None of those files needed to be migrated, so it seemed sufficient to ignore those cases. Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7636 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230786 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-27 19:29:02 +00:00
%arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1
[AArch64] CondOpt pass is missing FCMP instructions when searching backward for a CMP which defines the flags used by B.CC. http://reviews.llvm.org/D6047 Patch by Zhaoshi Zheng <zhaoshiz@codeaurora.org>! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220961 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-31 15:17:36 +00:00
%0 = load i8** %arrayidx, align 8
%cmp1 = icmp eq i8* %0, null
br i1 %cmp1, label %if.end, label %return
if.end: ; preds = %land.lhs.true, %entry
%call = call i32 @zoo(i32 1)
%call2 = call double @yoo(i32 -1)
%cmp4 = icmp sgt i32 %call, 0
%add = zext i1 %cmp4 to i32
%cond = add nsw i32 %add, %call
%call7 = call i32 @xoo(i32 %cond, i32 2)
%cmp9 = fcmp ogt double %call2, 0.000000e+00
br i1 %cmp9, label %cond.end14, label %cond.false12
cond.false12: ; preds = %if.end
%sub = fadd fast double %call2, -1.000000e+00
br label %cond.end14
cond.end14: ; preds = %if.end, %cond.false12
%cond15 = phi double [ %sub, %cond.false12 ], [ %call2, %if.end ]
%call16 = call i32 @woo(double %cond15, double -2.000000e+00)
br label %return
return: ; preds = %land.lhs.true, %cond.end14
%retval.0 = phi i32 [ 4, %cond.end14 ], [ 3, %land.lhs.true ]
ret i32 %retval.0
}
declare i32 @zoo(i32)
declare double @yoo(i32)
declare i32 @xoo(i32, i32)
declare i32 @woo(double, double)
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