78 lines
2.7 KiB
LLVM
78 lines
2.7 KiB
LLVM
|
; RUN: opt -gvn-hoist -newgvn -gvn-hoist -S < %s | FileCheck %s
|
||
|
|
; Test to demonstrate that newgvn creates opportunities for
|
||
|
|
; more gvn-hoist when sibling branches contain identical expressions.
|
||
|
|
|
||
|
|
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
|
||
|
|
target triple = "x86_64-unknown-linux-gnu"
|
||
|
|
|
||
|
|
; Check that all "or" expressions are hoisted.
|
||
|
|
; CHECK-LABEL: @encode
|
||
|
|
; CHECK: or i32
|
||
|
|
; CHECK-NOT: or i32
|
||
|
|
|
||
|
|
define i8* @encode(i8* %p, i32 %v) {
|
||
|
|
entry:
|
||
|
|
%p.addr = alloca i8*, align 8
|
||
|
|
%v.addr = alloca i32, align 4
|
||
|
|
store i8* %p, i8** %p.addr, align 8
|
||
|
|
store i32 %v, i32* %v.addr, align 4
|
||
|
|
%0 = load i32, i32* %v.addr, align 4
|
||
|
|
%cmp = icmp ult i32 %0, 23
|
||
|
|
br i1 %cmp, label %if.then, label %if.else
|
||
|
|
|
||
|
|
if.then: ; preds = %entry
|
||
|
|
%1 = load i32, i32* %v.addr, align 4
|
||
|
|
%or = or i32 %1, 128
|
||
|
|
%conv = trunc i32 %or to i8
|
||
|
|
%2 = load i8*, i8** %p.addr, align 8
|
||
|
|
%incdec.ptr = getelementptr inbounds i8, i8* %2, i32 1
|
||
|
|
store i8* %incdec.ptr, i8** %p.addr, align 8
|
||
|
|
store i8 %conv, i8* %2, align 1
|
||
|
|
br label %if.end15
|
||
|
|
|
||
|
|
if.else: ; preds = %entry
|
||
|
|
%3 = load i32, i32* %v.addr, align 4
|
||
|
|
%cmp1 = icmp ult i32 %3, 42
|
||
|
|
br i1 %cmp1, label %if.then3, label %if.else9
|
||
|
|
|
||
|
|
if.then3: ; preds = %if.else
|
||
|
|
%4 = load i32, i32* %v.addr, align 4
|
||
|
|
%or4 = or i32 %4, 128
|
||
|
|
%conv5 = trunc i32 %or4 to i8
|
||
|
|
%5 = load i8*, i8** %p.addr, align 8
|
||
|
|
%incdec.ptr6 = getelementptr inbounds i8, i8* %5, i32 1
|
||
|
|
store i8* %incdec.ptr6, i8** %p.addr, align 8
|
||
|
|
store i8 %conv5, i8* %5, align 1
|
||
|
|
%6 = load i32, i32* %v.addr, align 4
|
||
|
|
%conv7 = trunc i32 %6 to i8
|
||
|
|
%7 = load i8*, i8** %p.addr, align 8
|
||
|
|
%incdec.ptr8 = getelementptr inbounds i8, i8* %7, i32 1
|
||
|
|
store i8* %incdec.ptr8, i8** %p.addr, align 8
|
||
|
|
store i8 %conv7, i8* %7, align 1
|
||
|
|
br label %if.end
|
||
|
|
|
||
|
|
if.else9: ; preds = %if.else
|
||
|
|
%8 = load i32, i32* %v.addr, align 4
|
||
|
|
%or10 = or i32 %8, 128
|
||
|
|
%conv11 = trunc i32 %or10 to i8
|
||
|
|
%9 = load i8*, i8** %p.addr, align 8
|
||
|
|
%incdec.ptr12 = getelementptr inbounds i8, i8* %9, i32 1
|
||
|
|
store i8* %incdec.ptr12, i8** %p.addr, align 8
|
||
|
|
store i8 %conv11, i8* %9, align 1
|
||
|
|
%10 = load i32, i32* %v.addr, align 4
|
||
|
|
%shr = lshr i32 %10, 7
|
||
|
|
%conv13 = trunc i32 %shr to i8
|
||
|
|
%11 = load i8*, i8** %p.addr, align 8
|
||
|
|
%incdec.ptr14 = getelementptr inbounds i8, i8* %11, i32 1
|
||
|
|
store i8* %incdec.ptr14, i8** %p.addr, align 8
|
||
|
|
store i8 %conv13, i8* %11, align 1
|
||
|
|
br label %if.end
|
||
|
|
|
||
|
|
if.end: ; preds = %if.else9, %if.then3
|
||
|
|
br label %if.end15
|
||
|
|
|
||
|
|
if.end15: ; preds = %if.end, %if.then
|
||
|
|
%12 = load i8*, i8** %p.addr, align 8
|
||
|
|
ret i8* %12
|
||
|
|
}
|