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authorHal Finkel <hfinkel@anl.gov>2013-11-17 02:06:35 +0000
committerHal Finkel <hfinkel@anl.gov>2013-11-17 02:06:35 +0000
commit390564206f67b742ad7cbee1cf17ae52efa77cb6 (patch)
treeec0316c2a2513a18e1a2ad3fc6d49e1618f0eda5 /test/Transforms
parentbb756ca24401e190e3b704e5d92759c7a79cc6b7 (diff)
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Add the cold attribute to error-reporting call sites
Generally speaking, control flow paths with error reporting calls are cold. So far, error reporting calls are calls to perror and calls to fprintf, fwrite, etc. with stderr as the stream. This can be extended in the future. The primary motivation is to improve block placement (the cold attribute affects the static branch prediction heuristics). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194943 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
-rw-r--r--test/Transforms/InstCombine/err-rep-cold.ll77
1 files changed, 77 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/err-rep-cold.ll b/test/Transforms/InstCombine/err-rep-cold.ll
new file mode 100644
index 0000000..0cbafc4
--- /dev/null
+++ b/test/Transforms/InstCombine/err-rep-cold.ll
@@ -0,0 +1,77 @@
+; Test the static branch probability heuristics for error-reporting functions.
+; RUN: opt < %s -instcombine -S | FileCheck %s
+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-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%struct._IO_FILE = type { i32, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, %struct._IO_marker*, %struct._IO_FILE*, i32, i32, i64, i16, i8, [1 x i8], i8*, i64, i8*, i8*, i8*, i8*, i64, i32, [20 x i8] }
+%struct._IO_marker = type { %struct._IO_marker*, %struct._IO_FILE*, i32 }
+
+@stdout = external global %struct._IO_FILE*
+@stderr = external global %struct._IO_FILE*
+@.str = private unnamed_addr constant [13 x i8] c"an error: %d\00", align 1
+@.str1 = private unnamed_addr constant [9 x i8] c"an error\00", align 1
+
+define i32 @test1(i32 %a) #0 {
+; CHECK-LABEL: @test1
+entry:
+ %cmp = icmp sgt i32 %a, 8
+ br i1 %cmp, label %if.then, label %return
+
+if.then: ; preds = %entry
+ %0 = load %struct._IO_FILE** @stderr, align 8
+ %call = tail call i32 (%struct._IO_FILE*, i8*, ...)* @fprintf(%struct._IO_FILE* %0, i8* getelementptr inbounds ([13 x i8]* @.str, i64 0, i64 0), i32 %a) #1
+ br label %return
+
+; CHECK: %call = tail call i32 (%struct._IO_FILE*, i8*, ...)* @fprintf(%struct._IO_FILE* %0, i8* getelementptr inbounds ([13 x i8]* @.str, i64 0, i64 0), i32 %a) #[[AT1:[0-9]+]]
+
+return: ; preds = %entry, %if.then
+ %retval.0 = phi i32 [ 1, %if.then ], [ 0, %entry ]
+ ret i32 %retval.0
+}
+
+declare i32 @fprintf(%struct._IO_FILE* nocapture, i8* nocapture readonly, ...) #1
+
+define i32 @test2(i32 %a) #0 {
+; CHECK-LABEL: @test2
+entry:
+ %cmp = icmp sgt i32 %a, 8
+ br i1 %cmp, label %if.then, label %return
+
+if.then: ; preds = %entry
+ %0 = load %struct._IO_FILE** @stderr, align 8
+ %1 = tail call i64 @fwrite(i8* getelementptr inbounds ([9 x i8]* @.str1, i64 0, i64 0), i64 8, i64 1, %struct._IO_FILE* %0)
+ br label %return
+
+; CHECK: tail call i64 @fwrite(i8* getelementptr inbounds ([9 x i8]* @.str1, i64 0, i64 0), i64 8, i64 1, %struct._IO_FILE* %0) #[[AT2:[0-9]+]]
+
+return: ; preds = %entry, %if.then
+ %retval.0 = phi i32 [ 1, %if.then ], [ 0, %entry ]
+ ret i32 %retval.0
+}
+
+declare i64 @fwrite(i8* nocapture, i64, i64, %struct._IO_FILE* nocapture) #1
+
+define i32 @test3(i32 %a) #0 {
+; CHECK-LABEL: @test3
+entry:
+ %cmp = icmp sgt i32 %a, 8
+ br i1 %cmp, label %if.then, label %return
+
+if.then: ; preds = %entry
+ %0 = load %struct._IO_FILE** @stdout, align 8
+ %1 = tail call i64 @fwrite(i8* getelementptr inbounds ([9 x i8]* @.str1, i64 0, i64 0), i64 8, i64 1, %struct._IO_FILE* %0)
+ br label %return
+
+; CHECK-NOT: tail call i64 @fwrite(i8* getelementptr inbounds ([9 x i8]* @.str1, i64 0, i64 0), i64 8, i64 1, %struct._IO_FILE* %0) #[[AT2]]
+
+return: ; preds = %entry, %if.then
+ %retval.0 = phi i32 [ 1, %if.then ], [ 0, %entry ]
+ ret i32 %retval.0
+}
+
+attributes #0 = { nounwind uwtable }
+attributes #1 = { nounwind }
+
+; CHECK: attributes #[[AT1]] = { cold nounwind }
+; CHECK: attributes #[[AT2]] = { cold }
+