[reactos] 01/01: __rt_div fixes for arm (#3843)

[Roman Masanin]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=f2bc1f0e11187e84230fb…
commit f2bc1f0e11187e84230fb3319f7b6a281b8d2ffa
Author:     Roman Masanin <52833910+theR4K(a)users.noreply.github.com>
AuthorDate: Sat Jul 24 21:23:58 2021 +0300
Commit:     GitHub <noreply(a)github.com>
CommitDate: Sat Jul 24 20:23:58 2021 +0200
    __rt_div fixes for arm (#3843)
    [CRT/arm] Fix __rt_udiv and __rt_sdiv
---
 sdk/lib/crt/math/arm/__rt_div_worker.h | 27 +++++++++++++++++----------
 sdk/lib/crt/math/arm/__rt_sdiv.c       |  7 ++++---
 sdk/lib/crt/math/arm/__rt_sdiv64.s     | 15 +++++++--------
 sdk/lib/crt/math/arm/__rt_udiv.c       |  7 ++++---
 sdk/lib/crt/math/arm/__rt_udiv64.s     | 15 +++++++--------
 5 files changed, 39 insertions(+), 32 deletions(-)
diff --git a/sdk/lib/crt/math/arm/__rt_div_worker.h
b/sdk/lib/crt/math/arm/__rt_div_worker.h
index 2aef926d0d9..035b3abd045 100644
--- a/sdk/lib/crt/math/arm/__rt_div_worker.h
+++ b/sdk/lib/crt/math/arm/__rt_div_worker.h
@@ -25,10 +25,18 @@ __brkdiv0(void)
     __emit(0xDEF9);
 }
-typedef struct _ARM_DIVRESULT
+typedef union _ARM_DIVRESULT
 {
-    UINT3264 quotient; /* to be returned in R0 */
-    UINT3264 modulus;  /* to be returned in R1 */
+#ifdef _USE_64_BITS_
+    unsigned int raw_data[4];
+#else
+    unsigned long long raw_data;
+#endif
+    struct
+    {
+        UINT3264 quotient; /* to be returned in R0(R0,R1) */
+        UINT3264 modulus;  /* to be returned in R1(R2,R3) */
+    } data;
 } ARM_DIVRESULT;
 #ifndef _USE_64_BITS_
@@ -36,9 +44,9 @@ __forceinline
 #endif
 void
 __rt_div_worker(
-    ARM_DIVRESULT *result,
     UINT3264 divisor,
-    UINT3264 dividend)
+    UINT3264 dividend,
+    ARM_DIVRESULT* result)
 {
     UINT3264 shift;
     UINT3264 mask;
@@ -70,8 +78,8 @@ __rt_div_worker(
     if (divisor > dividend)
     {
-        result->quotient = 0;
-        result->modulus = divisor;
+        result->data.quotient = 0;
+        result->data.modulus = divisor;
         return;
     }
@@ -110,7 +118,6 @@ __rt_div_worker(
     }
 #endif // _SIGNED_DIV_
-    result->quotient = quotient;
-    result->modulus = dividend;
-    return;
+    result->data.quotient = quotient;
+    result->data.modulus = dividend;
 }
diff --git a/sdk/lib/crt/math/arm/__rt_sdiv.c b/sdk/lib/crt/math/arm/__rt_sdiv.c
index dea2b30e326..302cec422a4 100644
--- a/sdk/lib/crt/math/arm/__rt_sdiv.c
+++ b/sdk/lib/crt/math/arm/__rt_sdiv.c
@@ -13,14 +13,15 @@
 #include "__rt_div_worker.h"
-ARM_DIVRESULT
+unsigned long long
 __rt_sdiv(
     int divisor,
     int dividend)
 {
     ARM_DIVRESULT result;
-    __rt_sdiv_worker(&result, divisor, dividend);
-    return result;
+    __rt_sdiv_worker(divisor, dividend, &result);
+
+    return result.raw_data;
 }
diff --git a/sdk/lib/crt/math/arm/__rt_sdiv64.s b/sdk/lib/crt/math/arm/__rt_sdiv64.s
index c5ea8bb15ed..d3515a79729 100644
--- a/sdk/lib/crt/math/arm/__rt_sdiv64.s
+++ b/sdk/lib/crt/math/arm/__rt_sdiv64.s
@@ -18,19 +18,18 @@
     NESTED_ENTRY __rt_sdiv64
     /* Allocate stack space and store parameters there */
-    stmdb sp!,{r0,r1,r2,r3,lr}
+    push {lr}
+    sub sp,sp,0x10
+    mov r12,sp
+    push {r12}
     PROLOG_END
-    /* Load pointer to stack structure into R0 */
-    mov r0, sp
-
     /* Call the C worker function */
-    adr lr, Return
-    b __rt_sdiv64_worker
+    bl __rt_sdiv64_worker
+    add sp,sp,0x04
-Return
     /* Move result data into the appropriate registers and return */
-    ldmia sp!,{r0,r1,r2,r3,pc}
+    pop {r0,r1,r2,r3,pc}
     NESTED_END __rt_sdiv64
     END
diff --git a/sdk/lib/crt/math/arm/__rt_udiv.c b/sdk/lib/crt/math/arm/__rt_udiv.c
index 0d047e3c66a..2f47697d8ff 100644
--- a/sdk/lib/crt/math/arm/__rt_udiv.c
+++ b/sdk/lib/crt/math/arm/__rt_udiv.c
@@ -11,14 +11,15 @@
 #include "__rt_div_worker.h"
-ARM_DIVRESULT
+unsigned long long
 __rt_udiv(
     unsigned int divisor,
     unsigned int dividend)
 {
     ARM_DIVRESULT result;
-    __rt_udiv_worker(&result, divisor, dividend);
-    return result;
+    __rt_udiv_worker(divisor, dividend, &result);
+
+    return result.raw_data;
 }
diff --git a/sdk/lib/crt/math/arm/__rt_udiv64.s b/sdk/lib/crt/math/arm/__rt_udiv64.s
index 07c90bce81c..d08a02fc463 100644
--- a/sdk/lib/crt/math/arm/__rt_udiv64.s
+++ b/sdk/lib/crt/math/arm/__rt_udiv64.s
@@ -18,19 +18,18 @@
     NESTED_ENTRY __rt_udiv64
     /* Allocate stack space and store parameters there */
-    stmdb sp!,{r0,r1,r2,r3,lr}
+    push {lr}
+    sub sp,sp,0x10
+    mov r12,sp
+    push {r12}
     PROLOG_END
-    /* Load pointer to stack structure into R0 */
-    mov r0, sp
-
     /* Call the C worker function */
-    adr lr, Return
-    b __rt_udiv64_worker
+    bl __rt_udiv64_worker
+    add sp,sp,0x04
-Return
     /* Move result data into the appropriate registers and return */
-    ldmia sp!,{r0,r1,r2,r3,pc}
+    pop {r0,r1,r2,r3,pc}
     NESTED_END __rt_udiv64
     END