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467 Commits

Author SHA1 Message Date
Chris Lattner a45c5af87b Implement a trivial optimization to reduce the number of compares emitted. 
For:

  register short X;
  if (!X) {

We now produce:

        %tmp = load i16* %X             ; <i16> [#uses=1]
        %tobool = icmp ne i16 %tmp, 0           ; <i1> [#uses=1]
        %lnot = xor i1 %tobool, true            ; <i1> [#uses=1]
        br i1 %lnot, label %ifthen, label %ifend

instead of:

        %tmp = load i16* %X             ; <i16> [#uses=1]
        %tobool = icmp ne i16 %tmp, 0           ; <i1> [#uses=1]
        %lnot = xor i1 %tobool, true            ; <i1> [#uses=1]
        %lnot.ext = zext i1 %lnot to i32                ; <i32> [#uses=1]
        %tobool1 = icmp ne i32 %lnot.ext, 0             ; <i1> [#uses=1]
        br i1 %tobool1, label %ifthen, label %ifend

llvm-svn: 39560
 2007-06-02 19:47:04 +00:00
Chris Lattner f0106d2578 Refactor EvaluateScalarValueToBool out of if statement emission, so it can 
be shared.

Implement infrastructure for unary operator emission.

Implement basic logical not support.  We now compile:

  register short X;

  if (!X) {

into:

        %tmp = load i16* %X             ; <i16> [#uses=1]
        %tobool = icmp ne i16 %tmp, 0           ; <i1> [#uses=1]
        %lnot = xor i1 %tobool, true            ; <i1> [#uses=1]
        zext i1 %lnot to i32            ; <i32>:0 [#uses=1]
        %tobool1 = icmp ne i32 %0, 0            ; <i1> [#uses=1]
        br i1 %tobool1, label %ifthen, label %ifend

llvm-svn: 39559
 2007-06-02 19:33:17 +00:00
Chris Lattner d7f58867e5 Implement scaffolding for lvalues. Implement block vardecl lvalues. 
This allows us to translate:

int func() {
  register int X;
  {
    int Y;
    return 1+X+Y;
  }
}

into:

define i32 @func() {
entry:
        %X = alloca i32         ; <i32*> [#uses=1]
        %Y = alloca i32         ; <i32*> [#uses=1]
        %allocapt = bitcast i32 undef to i32            ; <i32> [#uses=0]
        %tmp = load i32* %X             ; <i32> [#uses=1]
        %tmp1 = add i32 1, %tmp         ; <i32> [#uses=1]
        %tmp2 = load i32* %Y            ; <i32> [#uses=1]
        %tmp3 = add i32 %tmp1, %tmp2            ; <i32> [#uses=1]
        ret i32 %tmp3
                ; No predecessors!
        ret i32 undef
}

llvm-svn: 39555
 2007-06-02 05:24:33 +00:00
Chris Lattner 03df12294b Add initial support for fixed-size local vardecls. This allows us to compile: 
int func() {
  register int X;
  {
    int Y;

into:

define i32 @func() {
entry:
        %X = alloca i32         ; <i32*> [#uses=0]
        %Y = alloca i32         ; <i32*> [#uses=0]
        %allocapt = bitcast i32 undef to i32            ; <i32> [#uses=0]
...

llvm-svn: 39553
 2007-06-02 04:53:11 +00:00
Chris Lattner 84915fa79b Start stubbing out decl codegen. 
llvm-svn: 39550
 2007-06-02 04:16:21 +00:00
Chris Lattner 3f3dbeedd3 implement codegen support for return of void and simple scalars. 
llvm-svn: 39547
 2007-06-02 03:19:07 +00:00
Chris Lattner adb6372aa5 Add support for functions that return non-void. 
llvm-svn: 39546
 2007-06-02 03:02:07 +00:00
Chris Lattner db91b16755 stub out codegen of binary plus. We now compile: 
if (11 + 42) {

to:

        %tmp = add i32 11, 42           ; <i32> [#uses=1]
        %tobool = icmp ne i32 %tmp, 0           ; <i1> [#uses=1]
        br i1 %tobool, label %ifthen, label %ifend


but this doesn't handle any of the interesting/hard stuff yet.

llvm-svn: 39545
 2007-06-02 00:16:28 +00:00
Chris Lattner e47e440c42 split stmt/expr codegen into their own files. 
llvm-svn: 39540
 2007-06-01 18:02:12 +00:00
Chris Lattner dc6e3feade emit a return at the end of the function. Run the llvm verifier. 
llvm-svn: 39534
 2007-05-30 22:55:31 +00:00
Chris Lattner 5269c0377c Add support for codegen'ing paren exprs and if stmts. We can now codegen: 
void test() {
  goto l;

l:
  if (11) {
    j: ;
  }
}

into:

define void @test() {
entry:
        br label %l

l:              ; preds = %entry
        icmp ne i32 11, 0               ; <i1>:0 [#uses=1]
        br i1 %0, label %ifthen, label %ifend

ifthen:         ; preds = %l
        br label %j

j:              ; preds = %ifthen
        br label %ifend

ifend:          ; preds = %j, %l
}

whoa... :)

llvm-svn: 39533
 2007-05-30 21:03:58 +00:00
Chris Lattner 208ae96a8c implement codegen of integer literals. 
llvm-svn: 39530
 2007-05-30 17:57:17 +00:00
Chris Lattner ac24820fa5 Implement codegen support for labels and gotos. We now compile: 
void test1() {
  foo:
    goto foo;
    goto foo;
    goto foo;
}

void test() {
  goto l;

l:
  ;
}
into:

define void @test1() {
entry:
        br label %foo

foo:            ; preds = %0, %foo, %entry
        br label %foo
                ; No predecessors!
        br label %foo
                ; No predecessors!
}

define void @test() {
entry:
        br label %l

l:              ; preds = %entry
}

llvm-svn: 39524
 2007-05-30 00:13:02 +00:00
Chris Lattner 308f431017 Add codegen support for NullStmt and CompoundStmt. {;;{};;} is now ours! 
llvm-svn: 39522
 2007-05-29 23:50:05 +00:00
Chris Lattner d1af2d2956 Implement conversion of clang ast types to LLVM types, at least for some trivial 
cases.

llvm-svn: 39519
 2007-05-29 23:17:50 +00:00
Chris Lattner bed314465a Reorganize codegen files. 
llvm-svn: 39504
 2007-05-28 01:07:47 +00:00
Chris Lattner f97fe38cb5 Initial scaffolding for an -emit-llvm mode. This requires the LLVM VMCore 
library to be built for the driver to link.

llvm-svn: 39495
 2007-05-24 06:29:05 +00:00