From 9da9934e27dfb48de77b80a3e20ed2d869b52024 Mon Sep 17 00:00:00 2001
From: Jakub Staszak <jstaszak@apple.com>
Date: Wed, 6 Jul 2011 18:22:43 +0000
Subject: Introduce "expect" intrinsic instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134516 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/LowerExpectIntrinsic/basic.ll | 251 ++++++++++++++++++++++++++
 1 file changed, 251 insertions(+)
 create mode 100644 test/Transforms/LowerExpectIntrinsic/basic.ll

(limited to 'test/Transforms/LowerExpectIntrinsic/basic.ll')

diff --git a/test/Transforms/LowerExpectIntrinsic/basic.ll b/test/Transforms/LowerExpectIntrinsic/basic.ll
new file mode 100644
index 0000000..c00127e
--- /dev/null
+++ b/test/Transforms/LowerExpectIntrinsic/basic.ll
@@ -0,0 +1,251 @@
+; RUN: opt -lower-expect -strip-dead-prototypes -S -o - < %s | FileCheck %s
+
+; CHECK: @test1
+define i32 @test1(i32 %x) nounwind uwtable ssp {
+entry:
+  %retval = alloca i32, align 4
+  %x.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  %tmp = load i32* %x.addr, align 4
+  %cmp = icmp sgt i32 %tmp, 1
+  %conv = zext i1 %cmp to i32
+  %conv1 = sext i32 %conv to i64
+  %expval = call i64 @llvm.expect.i64(i64 %conv1, i64 1)
+  %tobool = icmp ne i64 %expval, 0
+; CHECK: !prof !0
+; CHECK-NOT: @llvm.expect
+  br i1 %tobool, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %call = call i32 (...)* @f()
+  store i32 %call, i32* %retval
+  br label %return
+
+if.end:                                           ; preds = %entry
+  store i32 1, i32* %retval
+  br label %return
+
+return:                                           ; preds = %if.end, %if.then
+  %0 = load i32* %retval
+  ret i32 %0
+}
+
+declare i64 @llvm.expect.i64(i64, i64) nounwind readnone
+
+declare i32 @f(...)
+
+; CHECK: @test2
+define i32 @test2(i32 %x) nounwind uwtable ssp {
+entry:
+  %retval = alloca i32, align 4
+  %x.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  %tmp = load i32* %x.addr, align 4
+  %conv = sext i32 %tmp to i64
+  %expval = call i64 @llvm.expect.i64(i64 %conv, i64 1)
+  %tobool = icmp ne i64 %expval, 0
+; CHECK: !prof !0
+; CHECK-NOT: @llvm.expect
+  br i1 %tobool, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %call = call i32 (...)* @f()
+  store i32 %call, i32* %retval
+  br label %return
+
+if.end:                                           ; preds = %entry
+  store i32 1, i32* %retval
+  br label %return
+
+return:                                           ; preds = %if.end, %if.then
+  %0 = load i32* %retval
+  ret i32 %0
+}
+
+; CHECK: @test3
+define i32 @test3(i32 %x) nounwind uwtable ssp {
+entry:
+  %retval = alloca i32, align 4
+  %x.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  %tmp = load i32* %x.addr, align 4
+  %tobool = icmp ne i32 %tmp, 0
+  %lnot = xor i1 %tobool, true
+  %lnot.ext = zext i1 %lnot to i32
+  %conv = sext i32 %lnot.ext to i64
+  %expval = call i64 @llvm.expect.i64(i64 %conv, i64 1)
+  %tobool1 = icmp ne i64 %expval, 0
+; CHECK: !prof !0
+; CHECK-NOT: @llvm.expect
+  br i1 %tobool1, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %call = call i32 (...)* @f()
+  store i32 %call, i32* %retval
+  br label %return
+
+if.end:                                           ; preds = %entry
+  store i32 1, i32* %retval
+  br label %return
+
+return:                                           ; preds = %if.end, %if.then
+  %0 = load i32* %retval
+  ret i32 %0
+}
+
+; CHECK: @test4
+define i32 @test4(i32 %x) nounwind uwtable ssp {
+entry:
+  %retval = alloca i32, align 4
+  %x.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  %tmp = load i32* %x.addr, align 4
+  %tobool = icmp ne i32 %tmp, 0
+  %lnot = xor i1 %tobool, true
+  %lnot1 = xor i1 %lnot, true
+  %lnot.ext = zext i1 %lnot1 to i32
+  %conv = sext i32 %lnot.ext to i64
+  %expval = call i64 @llvm.expect.i64(i64 %conv, i64 1)
+  %tobool2 = icmp ne i64 %expval, 0
+; CHECK: !prof !0
+; CHECK-NOT: @llvm.expect
+  br i1 %tobool2, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %call = call i32 (...)* @f()
+  store i32 %call, i32* %retval
+  br label %return
+
+if.end:                                           ; preds = %entry
+  store i32 1, i32* %retval
+  br label %return
+
+return:                                           ; preds = %if.end, %if.then
+  %0 = load i32* %retval
+  ret i32 %0
+}
+
+; CHECK: @test5
+define i32 @test5(i32 %x) nounwind uwtable ssp {
+entry:
+  %retval = alloca i32, align 4
+  %x.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  %tmp = load i32* %x.addr, align 4
+  %cmp = icmp slt i32 %tmp, 0
+  %conv = zext i1 %cmp to i32
+  %conv1 = sext i32 %conv to i64
+  %expval = call i64 @llvm.expect.i64(i64 %conv1, i64 0)
+  %tobool = icmp ne i64 %expval, 0
+; CHECK: !prof !1
+; CHECK-NOT: @llvm.expect
+  br i1 %tobool, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %call = call i32 (...)* @f()
+  store i32 %call, i32* %retval
+  br label %return
+
+if.end:                                           ; preds = %entry
+  store i32 1, i32* %retval
+  br label %return
+
+return:                                           ; preds = %if.end, %if.then
+  %0 = load i32* %retval
+  ret i32 %0
+}
+
+; CHECK: @test6
+define i32 @test6(i32 %x) nounwind uwtable ssp {
+entry:
+  %retval = alloca i32, align 4
+  %x.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  %tmp = load i32* %x.addr, align 4
+  %conv = sext i32 %tmp to i64
+  %expval = call i64 @llvm.expect.i64(i64 %conv, i64 1)
+; CHECK: !prof !2
+; CHECK-NOT: @llvm.expect
+  switch i64 %expval, label %sw.epilog [
+    i64 1, label %sw.bb
+    i64 2, label %sw.bb
+  ]
+
+sw.bb:                                            ; preds = %entry, %entry
+  store i32 0, i32* %retval
+  br label %return
+
+sw.epilog:                                        ; preds = %entry
+  store i32 1, i32* %retval
+  br label %return
+
+return:                                           ; preds = %sw.epilog, %sw.bb
+  %0 = load i32* %retval
+  ret i32 %0
+}
+
+; CHECK: @test7
+define i32 @test7(i32 %x) nounwind uwtable ssp {
+entry:
+  %retval = alloca i32, align 4
+  %x.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  %tmp = load i32* %x.addr, align 4
+  %conv = sext i32 %tmp to i64
+  %expval = call i64 @llvm.expect.i64(i64 %conv, i64 1)
+; CHECK: !prof !3
+; CHECK-NOT: @llvm.expect
+  switch i64 %expval, label %sw.epilog [
+    i64 2, label %sw.bb
+    i64 3, label %sw.bb
+  ]
+
+sw.bb:                                            ; preds = %entry, %entry
+  %tmp1 = load i32* %x.addr, align 4
+  store i32 %tmp1, i32* %retval
+  br label %return
+
+sw.epilog:                                        ; preds = %entry
+  store i32 0, i32* %retval
+  br label %return
+
+return:                                           ; preds = %sw.epilog, %sw.bb
+  %0 = load i32* %retval
+  ret i32 %0
+}
+
+; CHECK: @test8
+define i32 @test8(i32 %x) nounwind uwtable ssp {
+entry:
+  %retval = alloca i32, align 4
+  %x.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  %tmp = load i32* %x.addr, align 4
+  %cmp = icmp sgt i32 %tmp, 1
+  %conv = zext i1 %cmp to i32
+  %expval = call i32 @llvm.expect.i32(i32 %conv, i32 1)
+  %tobool = icmp ne i32 %expval, 0
+; CHECK: !prof !0
+; CHECK-NOT: @llvm.expect
+  br i1 %tobool, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %call = call i32 (...)* @f()
+  store i32 %call, i32* %retval
+  br label %return
+
+if.end:                                           ; preds = %entry
+  store i32 1, i32* %retval
+  br label %return
+
+return:                                           ; preds = %if.end, %if.then
+  %0 = load i32* %retval
+  ret i32 %0
+}
+
+declare i32 @llvm.expect.i32(i32, i32) nounwind readnone
+
+; CHECK: !0 = metadata !{metadata !"branch_weights", i32 64, i32 4}
+; CHECK: !1 = metadata !{metadata !"branch_weights", i32 4, i32 64}
+; CHECK: !2 = metadata !{metadata !"branch_weights", i32 4, i32 64, i32 4}
+; CHECK: !3 = metadata !{metadata !"branch_weights", i32 64, i32 4, i32 4}
-- 
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