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llvm-project/llvm/test/CodeGen/PowerPC/early-ret.ll

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Adding -verify-machineinstrs option to PowerPC tests Currently we have a number of tests that fail with -verify-machineinstrs. To detect this cases earlier we add the option to the testcases with the exception of tests that will currently fail with this option. PR 27456 keeps track of this failures. No code review, as discussed with Hal Finkel. llvm-svn: 277624
2016-08-04 02:17:35 +08:00
; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc64-unknown-linux-gnu | FileCheck %s
Generate PPC early conditional returns PowerPC has a conditional branch to the link register (return) instruction: BCLR. This should be used any time when we'd otherwise have a conditional branch to a return. This adds a small pass, PPCEarlyReturn, which runs just prior to the branch selection pass (and, importantly, after block placement) to generate these conditional returns when possible. It will also eliminate unconditional branches to returns (these happen rarely; most of the time these have already been tail duplicated by the time PPCEarlyReturn is invoked). This is a nice optimization for small functions that do not maintain a stack frame. llvm-svn: 179026
2013-04-09 00:24:03 +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-f128:128:128-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
define void @foo(i32* %P) #0 {
entry:
%tobool = icmp eq i32* %P, null
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
TBAA: remove !tbaa from testing cases if not used. This will make it easier to turn on struct-path aware TBAA since the metadata format will change. llvm-svn: 180796
2013-05-01 01:52:57 +08:00
store i32 0, i32* %P, align 4
Generate PPC early conditional returns PowerPC has a conditional branch to the link register (return) instruction: BCLR. This should be used any time when we'd otherwise have a conditional branch to a return. This adds a small pass, PPCEarlyReturn, which runs just prior to the branch selection pass (and, importantly, after block placement) to generate these conditional returns when possible. It will also eliminate unconditional branches to returns (these happen rarely; most of the time these have already been tail duplicated by the time PPCEarlyReturn is invoked). This is a nice optimization for small functions that do not maintain a stack frame. llvm-svn: 179026
2013-04-09 00:24:03 +08:00
br label %if.end
if.end: ; preds = %entry, %if.then
ret void
; CHECK: @foo
; CHECK: beqlr
; CHECK: blr
}
define void @bar(i32* %P, i32* %Q) #0 {
entry:
%tobool = icmp eq i32* %P, null
br i1 %tobool, label %if.else, label %if.then
if.then: ; preds = %entry
TBAA: remove !tbaa from testing cases if not used. This will make it easier to turn on struct-path aware TBAA since the metadata format will change. llvm-svn: 180796
2013-05-01 01:52:57 +08:00
store i32 0, i32* %P, align 4
Generate PPC early conditional returns PowerPC has a conditional branch to the link register (return) instruction: BCLR. This should be used any time when we'd otherwise have a conditional branch to a return. This adds a small pass, PPCEarlyReturn, which runs just prior to the branch selection pass (and, importantly, after block placement) to generate these conditional returns when possible. It will also eliminate unconditional branches to returns (these happen rarely; most of the time these have already been tail duplicated by the time PPCEarlyReturn is invoked). This is a nice optimization for small functions that do not maintain a stack frame. llvm-svn: 179026
2013-04-09 00:24:03 +08:00
%tobool1 = icmp eq i32* %Q, null
br i1 %tobool1, label %if.end3, label %if.then2
if.then2: ; preds = %if.then
TBAA: remove !tbaa from testing cases if not used. This will make it easier to turn on struct-path aware TBAA since the metadata format will change. llvm-svn: 180796
2013-05-01 01:52:57 +08:00
store i32 1, i32* %Q, align 4
Generate PPC early conditional returns PowerPC has a conditional branch to the link register (return) instruction: BCLR. This should be used any time when we'd otherwise have a conditional branch to a return. This adds a small pass, PPCEarlyReturn, which runs just prior to the branch selection pass (and, importantly, after block placement) to generate these conditional returns when possible. It will also eliminate unconditional branches to returns (these happen rarely; most of the time these have already been tail duplicated by the time PPCEarlyReturn is invoked). This is a nice optimization for small functions that do not maintain a stack frame. llvm-svn: 179026
2013-04-09 00:24:03 +08:00
br label %if.end3
if.else: ; preds = %entry
TBAA: remove !tbaa from testing cases if not used. This will make it easier to turn on struct-path aware TBAA since the metadata format will change. llvm-svn: 180796
2013-05-01 01:52:57 +08:00
store i32 0, i32* %Q, align 4
Generate PPC early conditional returns PowerPC has a conditional branch to the link register (return) instruction: BCLR. This should be used any time when we'd otherwise have a conditional branch to a return. This adds a small pass, PPCEarlyReturn, which runs just prior to the branch selection pass (and, importantly, after block placement) to generate these conditional returns when possible. It will also eliminate unconditional branches to returns (these happen rarely; most of the time these have already been tail duplicated by the time PPCEarlyReturn is invoked). This is a nice optimization for small functions that do not maintain a stack frame. llvm-svn: 179026
2013-04-09 00:24:03 +08:00
br label %if.end3
if.end3: ; preds = %if.then, %if.then2, %if.else
ret void
; CHECK: @bar
; CHECK: beqlr
; CHECK: blr
}
Re-commit r235560: Switch lowering: extract jump tables and bit tests before building binary tree (PR22262) Third time's the charm. The previous commit was reverted as a reverse for-loop in SelectionDAGBuilder::lowerWorkItem did 'I--' on an iterator at the beginning of a vector, causing asserts when using debugging iterators. This commit fixes that. llvm-svn: 235608
2015-04-24 00:45:24 +08:00
@.str0 = private unnamed_addr constant [2 x i8] c"a\00"
@.str1 = private unnamed_addr constant [2 x i8] c"b\00"
@.str2 = private unnamed_addr constant [2 x i8] c"c\00"
@.str3 = private unnamed_addr constant [2 x i8] c"d\00"
@.str4 = private unnamed_addr constant [2 x i8] c"e\00"
define i8* @dont_assert(i32 %x) {
; LLVM would assert due to moving an early return into the jump table block and
; removing one of its predecessors despite that block ending with an indirect
; branch.
entry:
switch i32 %x, label %sw.epilog [
i32 1, label %return
i32 2, label %sw.bb1
i32 3, label %sw.bb2
i32 4, label %sw.bb3
i32 255, label %sw.bb4
]
sw.bb1: br label %return
sw.bb2: br label %return
sw.bb3: br label %return
sw.bb4: br label %return
sw.epilog: br label %return
return:
%retval.0 = phi i8* [ null, %sw.epilog ],
[ getelementptr inbounds ([2 x i8], [2 x i8]* @.str4, i64 0, i64 0), %sw.bb4 ],
[ getelementptr inbounds ([2 x i8], [2 x i8]* @.str3, i64 0, i64 0), %sw.bb3 ],
[ getelementptr inbounds ([2 x i8], [2 x i8]* @.str2, i64 0, i64 0), %sw.bb2 ],
[ getelementptr inbounds ([2 x i8], [2 x i8]* @.str1, i64 0, i64 0), %sw.bb1 ],
[ getelementptr inbounds ([2 x i8], [2 x i8]* @.str0, i64 0, i64 0), %entry ]
ret i8* %retval.0
}
Generate PPC early conditional returns PowerPC has a conditional branch to the link register (return) instruction: BCLR. This should be used any time when we'd otherwise have a conditional branch to a return. This adds a small pass, PPCEarlyReturn, which runs just prior to the branch selection pass (and, importantly, after block placement) to generate these conditional returns when possible. It will also eliminate unconditional branches to returns (these happen rarely; most of the time these have already been tail duplicated by the time PPCEarlyReturn is invoked). This is a nice optimization for small functions that do not maintain a stack frame. llvm-svn: 179026
2013-04-09 00:24:03 +08:00
attributes #0 = { nounwind }