1 files changed, 96 insertions, 0 deletions
diff --git a/lib/builtins/arm/aeabi_cdcmp.S b/lib/builtins/arm/aeabi_cdcmp.S
new file mode 100644
index 000000000000..036a6f542f79
--- /dev/null
+++ b/lib/builtins/arm/aeabi_cdcmp.S
@@ -0,0 +1,96 @@
+//===-- aeabi_cdcmp.S - EABI cdcmp* implementation ------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "../assembly.h"
+
+#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
+#error big endian support not implemented
+#endif
+
+#define APSR_Z (1 << 30)
+#define APSR_C (1 << 29)
+
+// void __aeabi_cdcmpeq(double a, double b) {
+//   if (isnan(a) || isnan(b)) {
+//     Z = 0; C = 1;
+//   } else {
+//     __aeabi_cdcmple(a, b);
+//   }
+// }
+
+        .syntax unified
+        .p2align 2
+DEFINE_COMPILERRT_FUNCTION(__aeabi_cdcmpeq)
+        push {r0-r3, lr}
+        bl __aeabi_cdcmpeq_check_nan
+        cmp r0, #1
+        pop {r0-r3, lr}
+
+        // NaN has been ruled out, so __aeabi_cdcmple can't trap
+        bne __aeabi_cdcmple
+
+        msr CPSR_f, #APSR_C
+        JMP(lr)
+END_COMPILERRT_FUNCTION(__aeabi_cdcmpeq)
+
+
+// void __aeabi_cdcmple(double a, double b) {
+//   if (__aeabi_dcmplt(a, b)) {
+//     Z = 0; C = 0;
+//   } else if (__aeabi_dcmpeq(a, b)) {
+//     Z = 1; C = 1;
+//   } else {
+//     Z = 0; C = 1;
+//   }
+// }
+
+        .syntax unified
+        .p2align 2
+DEFINE_COMPILERRT_FUNCTION(__aeabi_cdcmple)
+        // Per the RTABI, this function must preserve r0-r11.
+        // Save lr in the same instruction for compactness
+        push {r0-r3, lr}
+
+        bl __aeabi_dcmplt
+        cmp r0, #1
+        moveq ip, #0
+        beq 1f
+
+        ldm sp, {r0-r3}
+        bl __aeabi_dcmpeq
+        cmp r0, #1
+        moveq ip, #(APSR_C | APSR_Z)
+        movne ip, #(APSR_C)
+
+1:
+        msr CPSR_f, ip
+        pop {r0-r3}
+        POP_PC()
+END_COMPILERRT_FUNCTION(__aeabi_cdcmple)
+
+// int __aeabi_cdrcmple(double a, double b) {
+//   return __aeabi_cdcmple(b, a);
+// }
+
+        .syntax unified
+        .p2align 2
+DEFINE_COMPILERRT_FUNCTION(__aeabi_cdrcmple)
+        // Swap r0 and r2
+        mov ip, r0
+        mov r0, r2
+        mov r2, ip
+
+        // Swap r1 and r3
+        mov ip, r1
+        mov r1, r3
+        mov r3, ip
+
+        b __aeabi_cdcmple
+END_COMPILERRT_FUNCTION(__aeabi_cdrcmple)
+