8287552: riscv: Fix comment typo in li64

Co-authored-by: Dingli Zhang <[email protected]>
Reviewed-by: fyang

Author: 2 people

src/hotspot/cpu/riscv/assembler_riscv.cpp

@@ -118,7 +118,7 @@ void Assembler::_li(Register Rd, int64_t imm) {
 
 void Assembler::li64(Register Rd, int64_t imm) {
    // Load upper 32 bits. upper = imm[63:32], but if imm[31] == 1 or
-   // (imm[31:28] == 0x7ff && imm[19] == 1), upper = imm[63:32] + 1.
+   // (imm[31:20] == 0x7ff && imm[19] == 1), upper = imm[63:32] + 1.
    int64_t lower = imm & 0xffffffff;
    lower -= ((lower << 44) >> 44);
    int64_t tmp_imm = ((uint64_t)(imm & 0xffffffff00000000)) + (uint64_t)lower;
@@ -273,18 +273,18 @@ void Assembler::wrap_label(Register Rt, Label &L, jal_jalr_insn insn) {
 }
 
 void Assembler::movptr_with_offset(Register Rd, address addr, int32_t &offset) {
-  uintptr_t imm64 = (uintptr_t)addr;
+  int64_t imm64 = (int64_t)addr;
 #ifndef PRODUCT
   {
     char buffer[64];
     snprintf(buffer, sizeof(buffer), "0x%" PRIx64, imm64);
     block_comment(buffer);
   }
 #endif
-  assert(is_unsigned_imm_in_range(imm64, 47, 0) || (imm64 == (uintptr_t)-1),
+  assert(is_unsigned_imm_in_range(imm64, 47, 0) || (imm64 == (int64_t)-1),
          "bit 47 overflows in address constant");
   // Load upper 31 bits
-  int32_t imm = imm64 >> 17;
+  int64_t imm = imm64 >> 17;
   int64_t upper = imm, lower = imm;
   lower = (lower << 52) >> 52;
   upper -= lower;

src/hotspot/cpu/riscv/macroAssembler_riscv.cpp

@@ -1200,7 +1200,7 @@ static int patch_imm_in_li64(address branch, address target) {
   tmp_lower = (tmp_lower << 52) >> 52;
   tmp_upper -= tmp_lower;
   tmp_upper >>= 12;
-  // Load upper 32 bits. Upper = target[63:32], but if target[31] = 1 or (target[31:28] == 0x7ff && target[19] == 1),
+  // Load upper 32 bits. Upper = target[63:32], but if target[31] = 1 or (target[31:20] == 0x7ff && target[19] == 1),
   // upper = target[63:32] + 1.
   Assembler::patch(branch + 0,  31, 12, tmp_upper & 0xfffff);                       // Lui.
   Assembler::patch(branch + 4,  31, 20, tmp_lower & 0xfff);                         // Addi.