From 131ea138ae09e609d5bf01daf3c5bceafa0a9981 Mon Sep 17 00:00:00 2001
From: NunoSempere <nuno.sempere@protonmail.com>
Date: Sat, 3 Jun 2023 03:42:30 -0600
Subject: [PATCH] simplify xorshift implementation; struct not needed.

---
 C/scratchpad/xorshift   | Bin 16824 -> 16824 bytes
 C/scratchpad/xorshift.c |  25 ++++++++++---------------
 2 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/C/scratchpad/xorshift b/C/scratchpad/xorshift
index bb1d7a19161538531cf21bebecdf3598b94cfeff..552d370b684140678d6579066ee7c7495923db6d 100755
GIT binary patch
delta 183
zcmdnd%($bOaYF{P$m-A@=ZuAmdBuO2PM9UF{`}R$32B>an5Xi|xIX9&VC;5%;4#Ca
zm**%05O{REzVKi?;nB@7Sy#wdzWD$Lkm=ER{Dt)Y|NlFWdGy-$@-i^&04aU(|L^2#
zAvMk8fB*k)c74LwT>FH%?mE~2p!$tKQLr+P<|7i(v4{EPT{fQ+vf~qCWCZGU<r8RQ
aa^_`oZDwZryjf1sNR)|@adVJa8aDuQR7Z9I

delta 183
zcmdnd%($bOaYF{P$fZBB?@Q|KBDnmsWXiK1dpKMdS-!c3c`Bbw=!0(82Ocv#dU=jA
z0D(uh>kALY6CT|R&4(B#>k1i5cQbf&9)BVK|NsBaV;;S>6L}dJc7RmAVE#9`UPw*%
z^xyygn_ZtUHrGC3uDcG_4^+PuC<<2Q(R@TAI`(iHzkCZ&)8=zRc6>sALHb?!1lpLK
ZdD&c>nVH^imQyqmW%|poImj%H8vqX^M@#?!

diff --git a/C/scratchpad/xorshift.c b/C/scratchpad/xorshift.c
index 5457e6fa..e3b8ee81 100644
--- a/C/scratchpad/xorshift.c
+++ b/C/scratchpad/xorshift.c
@@ -2,34 +2,29 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-struct xorshift32_state {
-    uint32_t a;
-};
-
-uint32_t xorshift32(struct xorshift32_state *state)
+uint32_t xorshift32(uint32_t* state)
 {
 	/* Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs" */
-	uint32_t x = state->a;
+	uint32_t x = *state;
 	x ^= x << 13;
 	x ^= x >> 17;
 	x ^= x << 5;
-	return state->a = x;
+	return *state = x;
 }
 
 int main(){
-	struct xorshift32_state** state = malloc(sizeof(struct xorshift32_state*) * 4);
+	uint32_t** states = malloc(4 * sizeof(uint32_t*));
 	for(int i=0; i<4;i++){
-		state[i] = malloc(sizeof(struct xorshift32_state));
-		state[i]->a = (uint32_t) i + 1;
+		states[i] = malloc(sizeof(uint32_t));
+		*states[i] = i + 1;
 	}
 
-	printf("%i\n", xorshift32(state[0]));
-	printf("%i\n", xorshift32(state[0]));
+	printf("%i\n", xorshift32(states[0]));
+	printf("%i\n", xorshift32(states[1]));
 	for(int i=0; i<4;i++){
-		free(state[i]);
+		free(states[i]);
 	}
-	free(state);
-
+	free(states);
 
   return 0;
 }