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Optimize multiple int casts on ptrtoint, into a single cast. Fixed incorrect widening cast from signed -> unsigned.

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This commit is contained in:
Christoffer Lerno
2022-01-17 00:45:26 +01:00
parent 23461b179f
commit 99ea0afcbf
6 changed files with 32 additions and 8 deletions
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2
src/compiler/llvm_codegen_expr.c
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@@ -1300,7 +1300,7 @@ void llvm_emit_cast(GenContext *c, CastKind cast_kind, BEValue *value, Type *to_
llvm_value_rvalue(c, value);
value->value = type_convert_will_trunc(to_type, from_type)
? LLVMBuildTrunc(c->builder, value->value, llvm_get_type(c, to_type), "siuitrunc")
: LLVMBuildZExt(c->builder, value->value, llvm_get_type(c, to_type), "siuiext");
: LLVMBuildSExt(c->builder, value->value, llvm_get_type(c, to_type), "siuiext");
break;
case CAST_SIFP:
llvm_value_rvalue(c, value);

7
src/compiler/sema_casts.c
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@@ -245,6 +245,13 @@ bool lit_integer_to_enum(Expr *expr, Type *canonical, Type *type)
static bool int_conversion(Expr *expr, CastKind kind, Type *canonical, Type *type)
{
// Fold pointer casts if narrowing
if (expr->expr_kind == EXPR_CAST && expr->cast_expr.kind == CAST_PTRXI
&& type_size(type) <= type_size(expr->type))
{
expr->type = type;
return true;
}
if (insert_runtime_cast_unless_const(expr, kind, type)) return true;
expr->const_expr.ixx = int_conv(expr->const_expr.ixx, canonical->type_kind);

18
test/test_suite/cast/cast_from_ptr.c3t Normal file
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@@ -0,0 +1,18 @@
module test;
fn void tester()
{
int *x;
short y = (short)((uptr)(x));
uptr z = (uptr)((short)((uptr)(x)));
}
/* #expect: test.ll
%0 = load i32*, i32** %x, align 8
%ptrxi = ptrtoint i32* %0 to i16
store i16 %ptrxi, i16* %y, align 2
%1 = load i32*, i32** %x, align 8
%ptrxi1 = ptrtoint i32* %1 to i16
%siuiext = sext i16 %ptrxi1 to i64
store i64 %siuiext, i64* %z, align 8

5
test/test_suite/clang/2002-01_02.c3t
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@@ -234,9 +234,8 @@ if.then: ; preds = %loop.body
%3 = load %Edge_rec*, %Edge_rec** %basel, align 8
%4 = getelementptr inbounds %Edge_rec, %Edge_rec* %3, i32 0, i32 1
%5 = load %Edge_rec*, %Edge_rec** %4, align 8
%ptrxi = ptrtoint %Edge_rec* %5 to i64
%sisitrunc = trunc i64 %ptrxi to i32
ret i32 %sisitrunc
%ptrxi = ptrtoint %Edge_rec* %5 to i32
ret i32 %ptrxi
if.exit: ; preds = %loop.body
br label %loop.body

4
test/test_suite/functions/test_regression.c3t
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@@ -476,7 +476,7 @@ loop.cond: ; preds = %loop.body, %entry
loop.body: ; preds = %loop.cond
%6 = load i32, i32* %i, align 4
%7 = load i32, i32* %i, align 4
%siuiext = zext i32 %7 to i64
%siuiext = sext i32 %7 to i64
%8 = call i32 @"std::array::linkedlist.int.LinkedList__get"(%LinkedList* %list, i64 %siuiext)
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i32 0, i32 0), i32 %6, i32 %8)
%10 = load i32, i32* %i, align 4
@@ -511,7 +511,7 @@ loop.cond2: ; preds = %loop.body5, %loop.e
loop.body5: ; preds = %loop.cond2
%16 = load i32, i32* %i1, align 4
%17 = load i32, i32* %i1, align 4
%siuiext6 = zext i32 %17 to i64
%siuiext6 = sext i32 %17 to i64
%18 = call i32 @"std::array::list.int.List__get"(%List* %array, i64 %siuiext6)
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.5, i32 0, i32 0), i32 %16, i32 %18)
%20 = load i32, i32* %i1, align 4

4
test/test_suite/functions/test_regression_mingw.c3t
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@@ -538,7 +538,7 @@ loop.cond: ; preds = %loop.body, %entry
loop.body: ; preds = %loop.cond
%6 = load i32, i32* %i, align 4
%7 = load i32, i32* %i, align 4
%siuiext = zext i32 %7 to i64
%siuiext = sext i32 %7 to i64
%8 = call i32 @"std::array::linkedlist.int.LinkedList__get"(%LinkedList* %list, i64 %siuiext)
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i32 0, i32 0), i32 %6, i32 %8)
%10 = load i32, i32* %i, align 4
@@ -573,7 +573,7 @@ loop.cond2: ; preds = %loop.body5, %loop.e
loop.body5: ; preds = %loop.cond2
%16 = load i32, i32* %i1, align 4
%17 = load i32, i32* %i1, align 4
%siuiext6 = zext i32 %17 to i64
%siuiext6 = sext i32 %17 to i64
%18 = call i32 @"std::array::list.int.List__get"(%List* %array, i64 %siuiext6)
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.5, i32 0, i32 0), i32 %16, i32 %18)
%20 = load i32, i32* %i1, align 4