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instcombine: Migrate strchr and strrchr optimizations

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This patch migrates the strchr and strrchr optimizations from the
simplify-libcalls pass into the instcombine library call simplifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165875 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-10-13 16:45:37 +00:00
parent 73d8a5864f
commit 186f8d90df
8 changed files with 236 additions and 140 deletions
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test/Transforms/SimplifyLibCalls/StrChr.ll
-26
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@@ -1,26 +0,0 @@
; Test that the StrChrOptimizer works correctly
; RUN: opt < %s -simplify-libcalls -S | FileCheck %s
; This transformation requires the pointer size, as it assumes that size_t is
; the size of a pointer.
target datalayout = "-p:64:64:64"
@hello = constant [14 x i8] c"hello world\5Cn\00"
@null = constant [1 x i8] zeroinitializer
declare i8* @strchr(i8*, i32)
define i32 @foo(i32 %index) {
%hello_p = getelementptr [14 x i8]* @hello, i32 0, i32 0
%null_p = getelementptr [1 x i8]* @null, i32 0, i32 0
%world = call i8* @strchr(i8* %hello_p, i32 119)
; CHECK: getelementptr i8* %hello_p, i64 6
%ignore = call i8* @strchr(i8* %null_p, i32 119)
; CHECK-NOT: call i8* strchr
%null = call i8* @strchr(i8* %hello_p, i32 0)
; CHECK: getelementptr i8* %hello_p, i64 13
%result = call i8* @strchr(i8* %hello_p, i32 %index)
; CHECK: call i8* @memchr(i8* %hello_p, i32 %index, i64 14)
ret i32 %index
}
test/Transforms/SimplifyLibCalls/StrRChr.ll
-23
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@@ -1,23 +0,0 @@
; Test that the StrRChrOptimizer works correctly
; RUN: opt < %s -simplify-libcalls -S | FileCheck %s
target datalayout = "-p:64:64:64"
@hello = constant [14 x i8] c"hello world\5Cn\00"
@null = constant [1 x i8] zeroinitializer
declare i8* @strrchr(i8*, i32)
define void @foo(i8* %bar) {
%hello_p = getelementptr [14 x i8]* @hello, i32 0, i32 0
%null_p = getelementptr [1 x i8]* @null, i32 0, i32 0
%world = call i8* @strrchr(i8* %hello_p, i32 119)
; CHECK: getelementptr i8* %hello_p, i64 6
%ignore = call i8* @strrchr(i8* %null_p, i32 119)
; CHECK-NOT: call i8* strrchr
%null = call i8* @strrchr(i8* %hello_p, i32 0)
; CHECK: getelementptr i8* %hello_p, i64 13
%strchr = call i8* @strrchr(i8* %bar, i32 0)
; CHECK: call i8* @strchr(i8* %bar, i32 0)
ret void
}