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llvm-project/llvm/test/Transforms/CodeGenPrepare/basic.ll

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Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID This is done to avoid odd test failures, like the one fixed in r171243. llvm-svn: 171246
2012-12-30 09:28:40 +08:00
; RUN: opt -codegenprepare -S < %s | FileCheck %s
Now that instruction optzns can update the iterator as they go, we can have objectsize folding recursively simplify away their result when it folds. It is important to catch this here, because otherwise we won't eliminate the cross-block values at isel and other times. llvm-svn: 123524
2011-01-15 15:25:29 +08:00
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-darwin10.0.0"
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: @test1(
fix rdar://8785296 - -fcatch-undefined-behavior generates inefficient code The basic issue is that isel (very reasonably!) expects conditional branches to be folded, so CGP leaving around a bunch dead computation feeding conditional branches isn't such a good idea. Just fold branches on constants into unconditional branches. llvm-svn: 123526
2011-01-15 15:36:13 +08:00
; objectsize should fold to a constant, which causes the branch to fold to an
During the CodeGenPrepare we often lower intrinsics (such as objsize) and allow some optimizations to turn conditional branches into unconditional. This commit adds a simple control-flow optimization which merges two consecutive basic blocks which are connected by a single edge. This allows the codegen to operate on larger basic blocks. rdar://11973998 llvm-svn: 161852
2012-08-14 13:19:07 +08:00
; uncond branch. Next, we fold the control flow alltogether.
fix rdar://8785296 - -fcatch-undefined-behavior generates inefficient code The basic issue is that isel (very reasonably!) expects conditional branches to be folded, so CGP leaving around a bunch dead computation feeding conditional branches isn't such a good idea. Just fold branches on constants into unconditional branches. llvm-svn: 123526
2011-01-15 15:36:13 +08:00
; rdar://8785296
Now that instruction optzns can update the iterator as they go, we can have objectsize folding recursively simplify away their result when it folds. It is important to catch this here, because otherwise we won't eliminate the cross-block values at isel and other times. llvm-svn: 123524
2011-01-15 15:25:29 +08:00
define i32 @test1(i8* %ptr) nounwind ssp noredzone align 2 {
entry:
%0 = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
%1 = icmp ugt i64 %0, 3
br i1 %1, label %T, label %trap
During the CodeGenPrepare we often lower intrinsics (such as objsize) and allow some optimizations to turn conditional branches into unconditional. This commit adds a simple control-flow optimization which merges two consecutive basic blocks which are connected by a single edge. This allows the codegen to operate on larger basic blocks. rdar://11973998 llvm-svn: 161852
2012-08-14 13:19:07 +08:00
; CHECK: T:
; CHECK-NOT: br label %
temporarily revert r123526. While working on a follow-on patch I realize that ConstantFoldTerminator doesn't preserve dominfo. llvm-svn: 123527
2011-01-15 15:51:19 +08:00
Now that instruction optzns can update the iterator as they go, we can have objectsize folding recursively simplify away their result when it folds. It is important to catch this here, because otherwise we won't eliminate the cross-block values at isel and other times. llvm-svn: 123524
2011-01-15 15:25:29 +08:00
trap: ; preds = %0, %entry
tail call void @llvm.trap() noreturn nounwind
unreachable
T:
Roll r127459 back in: Optimize trivial branches in CodeGenPrepare, which often get created from the lowering of objectsize intrinsics. Unfortunately, a number of tests were relying on llc not optimizing trivial branches, so I had to add an option to allow them to continue to test what they originally tested. This fixes <rdar://problem/8785296> and <rdar://problem/9112893>. llvm-svn: 127498
2011-03-12 05:52:04 +08:00
; CHECK: ret i32 4
Now that instruction optzns can update the iterator as they go, we can have objectsize folding recursively simplify away their result when it folds. It is important to catch this here, because otherwise we won't eliminate the cross-block values at isel and other times. llvm-svn: 123524
2011-01-15 15:25:29 +08:00
ret i32 4
}
declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readonly
declare void @llvm.trap() nounwind