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[Decompiler] Misc fixes for gkernel/math (#257)

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* more cases

* some work on math and floating point stuff

* some decompiling for fun
This commit is contained in:
water111
2021-02-13 11:32:52 -05:00
committed by GitHub
parent a3b31d3c0e
commit 126dfc1c45
31 changed files with 1388 additions and 358 deletions
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test/decompiler/test_math_decomp.cpp
+106
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#include "gtest/gtest.h"
#include "FormRegressionTest.h"
using namespace decompiler;
TEST_F(FormRegressionTest, ExprTruncate) {
std::string func =
" sll r0, r0, 0\n"
" mtc1 f0, a0\n"
" cvt.w.s f0, f0\n"
" cvt.s.w f0, f0\n"
" mfc1 v0, f0\n"
" jr ra\n"
" daddu sp, sp, r0";
std::string type = "(function float float)";
std::string expected = "(the float (the int arg0))";
test_with_expr(func, type, expected);
}
TEST_F(FormRegressionTest, ExprIntegralP) {
std::string func =
" sll r0, r0, 0\n"
" mtc1 f0, a0\n"
" cvt.w.s f0, f0\n"
" cvt.s.w f0, f0\n"
" mfc1 v1, f0\n"
" mtc1 f0, v1\n"
" mtc1 f1, a0\n"
" c.eq.s f0, f1\n"
" bc1t L31\n"
" daddiu v0, s7, 8\n"
" or v0, s7, r0\n"
"L31:\n"
" jr ra\n"
" daddu sp, sp, r0";
std::string type = "(function float float)";
std::string expected = "(the-as float (= (the float (the int arg0)) arg0))";
test_with_expr(func, type, expected);
}
TEST_F(FormRegressionTest, ExprFractionalPart) {
std::string func =
" sll r0, r0, 0\n"
" mtc1 f0, a0\n"
" mtc1 f1, a0\n"
" cvt.w.s f1, f1\n"
" cvt.s.w f1, f1\n"
" mfc1 v1, f1\n"
" mtc1 f1, v1\n"
" sub.s f0, f0, f1\n"
" mfc1 v0, f0\n"
" jr ra\n"
" daddu sp, sp, r0";
std::string type = "(function float float)";
std::string expected = "(- arg0 (the float (the int arg0)))";
test_with_expr(func, type, expected);
}
TEST_F(FormRegressionTest, ExprSeek) {
std::string func =
" sll r0, r0, 0\n"
"L24:\n"
" mtc1 f0, a0\n"
" mtc1 f3, a1\n"
" mtc1 f1, a2\n"
" sub.s f2, f3, f0\n"
" abs.s f4, f2\n"
" c.lt.s f1, f4\n"
" bc1t L25\n"
" sll r0, r0, 0\n"
" mfc1 v0, f3\n"
" beq r0, r0, L27\n"
" sll r0, r0, 0\n"
"L25:\n"
" mtc1 f3, r0\n"
" c.lt.s f2, f3\n"
" bc1t L26\n"
" sll r0, r0, 0\n"
" add.s f0, f0, f1\n"
" mfc1 v0, f0\n"
" beq r0, r0, L27\n"
" sll r0, r0, 0\n"
"L26:\n"
" sub.s f0, f0, f1\n"
" mfc1 v0, f0\n"
"L27:\n"
" jr ra\n"
" daddu sp, sp, r0";
std::string type = "(function float float float float)";
std::string expected =
"(begin\n"
" (set! f2-0 (- arg1 arg0))\n"
" (cond\n"
" ((>= arg2 (fabs f2-0)) arg1)\n"
" ((>= f2-0 0) (+ arg0 arg2))\n"
" (else (- arg0 arg2))\n"
" )\n"
" )";
test_with_expr(func, type, expected);
}