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8388120: [s390x] c2: c_return_value is redundant

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Reviewed-by: amitkumar, rrich
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April Ivy 2026-07-13 13:36:26 +00:00 committed by Amit Kumar
parent bc1bd75e7b
commit 0dcfa722aa
1 changed files with 21 additions and 18 deletions
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39
src/hotspot/cpu/s390/s390.ad
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@ -2617,28 +2617,31 @@ frame %{
// stack slot.
return_addr(REG Z_R14);
// Location of native (C/C++) and interpreter return values. This
// is specified to be the same as Java. In the 32-bit VM, long
// values are actually returned from native calls in O0:O1 and
// returned to the interpreter in I0:I1. The copying to and from
// the register pairs is done by the appropriate call and epilog
// opcodes. This simplifies the register allocator.
//
// Use register pair for c return value.
c_return_value %{
assert(ideal_reg >= Op_RegI && ideal_reg <= Op_RegL, "only return normal values");
static int typeToRegLo[Op_RegL+1] = { 0, 0, Z_R2_num, Z_R2_num, Z_R2_num, Z_F0_num, Z_F0_num, Z_R2_num };
static int typeToRegHi[Op_RegL+1] = { 0, 0, OptoReg::Bad, OptoReg::Bad, Z_R2_H_num, OptoReg::Bad, Z_F0_H_num, Z_R2_H_num };
return OptoRegPair(typeToRegHi[ideal_reg], typeToRegLo[ideal_reg]);
%}
// Use register pair for return value.
// Location of compiled Java return values. Same as C
return_value %{
assert(ideal_reg >= Op_RegI && ideal_reg <= Op_RegL, "only return normal values");
static int typeToRegLo[Op_RegL+1] = { 0, 0, Z_R2_num, Z_R2_num, Z_R2_num, Z_F0_num, Z_F0_num, Z_R2_num };
static int typeToRegHi[Op_RegL+1] = { 0, 0, OptoReg::Bad, OptoReg::Bad, Z_R2_H_num, OptoReg::Bad, Z_F0_H_num, Z_R2_H_num };
return OptoRegPair(typeToRegHi[ideal_reg], typeToRegLo[ideal_reg]);
static const int lo[Op_RegL + 1] = {
0,
0,
Z_R2_num, // Op_RegN
Z_R2_num, // Op_RegI
Z_R2_num, // Op_RegP
Z_F0_num, // Op_RegF
Z_F0_num, // Op_RegD
Z_R2_num // Op_RegL
};
static const int hi[Op_RegL + 1] = {
0,
0,
OptoReg::Bad, // Op_RegN
OptoReg::Bad, // Op_RegI
Z_R2_H_num, // Op_RegP
OptoReg::Bad, // Op_RegF
Z_F0_H_num, // Op_RegD
Z_R2_H_num // Op_RegL
};
return OptoRegPair(hi[ideal_reg], lo[ideal_reg]);
%}
%}