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+
+// Select C numeric constant
+ .radix C
+// for 64 bit mode, use .psr abi64
+ .psr abi64
+// little endian
+ .psr lsb
+// Section has executable code
+ .section .text, "ax","progbits"
+// procedure named 'NS_InvokeByIndex'
+ .proc NS_InvokeByIndex
+// manual bundling
+ .explicit
+
+// extern "C" uint32_t
+// invoke_copy_to_stack(uint64_t* d,
+// const uint32_t paramCount, nsXPTCVariant* s)
+ .global invoke_copy_to_stack
+// .exclass invoke_copy_to_stack, @fullyvisible
+ .type invoke_copy_to_stack,@function
+
+// .exclass NS_InvokeByIndex, @fullyvisible
+ .type NS_InvokeByIndex,@function
+
+// XPTC_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
+// uint32_t paramCount, nsXPTCVariant* params);
+NS_InvokeByIndex::
+ .prologue
+ .save ar.pfs, r37
+// allocate 4 input args, 6 local args, and 8 output args
+ alloc r37 = ar.pfs, 4, 6, 8, 0 // M
+ nop.i 0 ;; // I
+
+// unwind table already knows gp, no need to specify anything
+ add r39 = 0, gp // A
+ .save rp, r36
+ mov r36 = rp // I
+ .vframe r38
+ add r38 = 0, sp ;; // A
+
+// We first calculate the amount of extra memory stack space required
+// for the arguments, and register storage.
+// We then call invoke_copy_to_stack() to write the argument contents
+// to the specified memory regions.
+// We then copy the integer arguments to integer registers, and floating
+// arguments to float registers.
+// Lastly we load the virtual table jump pointer, and call the target
+// subroutine.
+
+// in0 : that
+// in1 : methodIndex
+// in2 : paramCount
+// in3 : params
+
+// stack frame size is 16 + (8 * even(paramCount)) + 64 + 64
+// 16 byte frame header
+// 8 * even(paramCount) memory argument area
+// 64 bytes integer register area
+// 64 bytes float register area
+// This scheme makes sure stack fram size is a multiple of 16
+
+ .body
+ add r10 = 8, r0 // A
+// r41 points to float register area
+ add r41 = -64, sp // A
+// r40 points to int register area
+ add r40 = -128, sp ;; // A
+
+ add out1 = 0, r40 // A
+ add out2 = 0, r41 // A
+ tbit.z p14,p15 = in2,0 ;; // I
+
+// compute 8 * even(paramCount)
+(p14) shladd r11 = in2, 3, r0 ;; // A
+(p15) shladd r11 = in2, 3, r10 ;; // A
+ sub out0 = r40, r11 ;; // A
+
+// advance the stack frame
+ add sp = -16, out0 // A
+ add out3 = 0, in2 // A
+ add out4 = 0, in3 // A
+
+// branch to invoke_copy_to_stack
+ br.call.sptk.few rp = invoke_copy_to_stack ;; // B
+
+// restore gp
+ add gp = 0, r39 // A
+ add out0 = 0, in0 // A
+
+// load the integer and float registers
+ ld8 out1 = [r40], 8 // M
+ ldfd f8 = [r41], 8 ;; // M
+
+ ld8 out2 = [r40], 8 // M
+ ldfd f9 = [r41], 8 ;; // M
+
+ ld8 out3 = [r40], 8 // M
+ ldfd f10 = [r41], 8 ;; // M
+
+ ld8 out4 = [r40], 8 // M
+ ldfd f11 = [r41], 8 ;; // M
+
+ ld8 out5 = [r40], 8 // M
+ ldfd f12 = [r41], 8 ;; // M
+// 16 * methodIndex
+ shladd r11 = in1, 4, r0 // A
+
+ ld8 out6 = [r40], 8 // M
+ ldfd f13 = [r41], 8 ;; // M
+
+ ld8 out7 = [r40], 8 // M
+ ldfd f14 = [r41], 8 // M
+ add r8 = 0, in0 ;; // A
+
+// look up virtual base table and dispatch to target subroutine
+// This section assumes 64 bit pointer mode, and virtual base table
+// layout from the ABI http://www.codesourcery.com/cxx-abi/abi.html
+
+// load base table
+ ld8 r8 = [r8] ;; // M
+ add r8 = r11, r8 ;; // A
+
+ // first entry is jump pointer, second entry is gp
+ add r9 = 8, r8 ;; // A
+// load jump pointer
+ ld8 r8 = [r8]
+
+// load gp
+ ld8 gp = [r9] ;; // M
+ mov b6 = r8 ;; // I
+
+// branch to target virtual function
+ br.call.sptk.few rp = b6 ;; // B
+
+// epilog
+ mov ar.pfs = r37 // I
+ mov rp = r36 ;; // I
+
+ add sp = 0, r38 // A
+ add gp = 0, r39 // A
+ br.ret.sptk.few rp ;; // B
+
+ .endp
+
+/* Magic indicating no need for an executable stack */
+ .section .note.GNU-stack, "", @progbits