Revert "Use 64-bit register values (#72)"

This reverts commit 44f94d9.

Author: cadmic

helpers.h

@@ -3,14 +3,14 @@
 
 #include <stdint.h>
 
-#define MEM_F64(a) (double_from_memory(mem, (uint32_t)(a)))
-#define MEM_F32(a) (*(float *)(mem + (uint32_t)(a)))
-#define MEM_U32(a) (*(uint32_t *)(mem + (uint32_t)(a)))
-#define MEM_S32(a) (*(int32_t *)(mem + (uint32_t)(a)))
-#define MEM_U16(a) (*(uint16_t *)(mem + ((uint32_t)(a) ^ 2)))
-#define MEM_S16(a) (*(int16_t *)(mem + ((uint32_t)(a) ^ 2)))
-#define MEM_U8(a) (*(uint8_t *)(mem + ((uint32_t)(a) ^ 3)))
-#define MEM_S8(a) (*(int8_t *)(mem + ((uint32_t)(a) ^ 3)))
+#define MEM_F64(a) (double_from_memory(mem, a))
+#define MEM_F32(a) (*(float *)(mem + a))
+#define MEM_U32(a) (*(uint32_t *)(mem + a))
+#define MEM_S32(a) (*(int32_t *)(mem + a))
+#define MEM_U16(a) (*(uint16_t *)(mem + ((a) ^ 2)))
+#define MEM_S16(a) (*(int16_t *)(mem + ((a) ^ 2)))
+#define MEM_U8(a) (*(uint8_t *)(mem + ((a) ^ 3)))
+#define MEM_S8(a) (*(int8_t *)(mem + ((a) ^ 3)))
 
 #if !defined(__GNUC__) && !defined(__clang__)
 #define __attribute__(x)

libc_impl.c

@@ -2814,7 +2814,7 @@ uint32_t wrapper_tfind(uint8_t* mem, uint32_t key_addr, uint32_t rootp_addr, uin
 // qsort implementation from SGI libc, originally derived from
 // https://people.ece.ubc.ca/~eddieh/glu_dox/d7/da4/qsort_8c_source.html (public domain)
 
-#define CMP(x, y) ((int32_t)(trampoline(mem, sp, (x), (y), 0, 0, compare_addr).v0))
+#define CMP(x, y) (int32_t)(trampoline(mem, sp, (x), (y), 0, 0, compare_addr) >> 32)
 
 static void qst(uint8_t* mem, uint32_t start, uint32_t end, fptr_trampoline trampoline, uint32_t compare_addr,
                 uint32_t sp, uint32_t size, uint32_t minSortSize, uint32_t medianOfThreeThreshold);

libc_impl.h

@@ -9,13 +9,9 @@ union FloatReg {
     //double d;
 };
 
-struct ReturnValue {
-    uint64_t v0;
-    uint64_t v1;
-};
+typedef uint64_t (*fptr_trampoline)(uint8_t* mem, uint32_t sp, uint32_t a0, uint32_t a1, uint32_t a2, uint32_t a3,
+                                    uint32_t fp_dest);
 
-typedef struct ReturnValue (*fptr_trampoline)(uint8_t* mem, uint32_t sp, uint64_t a0, uint64_t a1, uint64_t a2, uint64_t a3,
-                                              uint32_t fp_dest);
 
 void mmap_initial_data_range(uint8_t *mem, uint32_t start, uint32_t end);
 void setup_libc_data(uint8_t *mem);