I am porting llvm-gcc frontend. We have ported GCC4.2 for our target. So I move
*.h *.md and *.c to llvm-gcc. I do not implement any LLVM MACRO, and use
default action of llvm-gcc. I get a new llvm-gcc for our target. But I get a
bug.
/******************************/
//#include <stdio.h>
union MYunion {
unsigned char uc ;
int ui;
} myunion;
void vfu1(union MYunion u) {
u.ui = 99;
}
void unions() {
myunion.ui = 0;
vfu1(myunion);
iequals(244, myunion.ui, 0);
}
int iequals( int line, int val1, int val2) {
printf("in iequals: line = %d, val1 = %d, val2 = %d\n", line,
val1, val2);
if(val1 == val2) {
printf("val1 == val2\n");
} else {
printf("val1 != val2\n");
}
return 1;
}
int main() {
unions();
return 0;
}
/1. ****************I get IR from my llvm-gcc.*****************************/
%struct.MYunion = type { i32 }
@myunion = common global %struct.MYunion zeroinitializer ;
<%struct.MYunion*> [#uses=2]
@.str = internal constant [45 x i8] c"in iequals: line = %d, val1 = %d,
val2 = %d\0A\00" ; <[45 x i8]*> [#uses=1]
@.str1 = internal constant [13 x i8] c"val1 == val2\00" ;
<[13 x i8]*> [#uses=1]
@.str2 = internal constant [13 x i8] c"val1 != val2\00" ;
<[13 x i8]*> [#uses=1]
define void @vfu1(%struct.MYunion* byval align 4 %u) nounwind {
entry:
%0 = getelementptr %struct.MYunion* %u, i32 0, i32 0 ;
<i32*> [#uses=1]
store i32 99, i32* %0, align 4
br label %return
return: ; preds = %entry
ret void
}
define void @unions() nounwind {
entry:
store i32 0, i32* getelementptr (%struct.MYunion* @myunion, i32 0, i32
0), align 4
call void @vfu1(%struct.MYunion* byval align 4 @myunion) nounwind
%0 = load i32* getelementptr (%struct.MYunion* @myunion, i32 0, i32 0),
align 4 ; <i32> [#uses=1]
%1 = call i32 (...)* bitcast (i32 (i32, i32, i32)* @iequals to i32
(...)*)(i32 244, i32 %0, i32 0) nounwind ; <i32> [#uses=0]
br label %return
return: ; preds = %entry
ret void
}
/2. ***********After llvm optimize pass. I get *****************/
declare i32 @printf(i8*, ...) nounwind
declare i32 @puts(i8*)
define i32 @main() nounwind {
return:
%0 = call i32 (i8*, ...)* @printf(i8* getelementptr ([45 x i8]* @.str,
i32 0, i32 0), i32 244, i32 99, i32 0) nounwind ; <i32> [#uses=0]
%1 = call i32 @puts(i8* getelementptr ([13 x i8]* @.str2, i32 0, i32 0))
nounwind ; <i32> [#uses=0]
ret i32 0
}
/3. ***********My question*********/
It means that function "void vfu1(union MYunion u)" modifies global
varible myunion. But llvm-gcc of X86 will not do that. So my llvm-gcc has a bug.
1) Which function or Macro changes "vfu1" function's arguments
type?
2) Which Macro of GCC or LLVM does I implement to control this arguments type
convert?
___________________________________________________________
好玩贺卡等你发，邮箱贺卡全新上线！
http://card.mail.cn.yahoo.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20090923/208daa79/attachment.html>