mirror of
https://github.com/c64scene-ar/llvm-6502.git
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7c2ef822f7
Summary:
RET, and RET_MM have been replaced by a pseudo named PseudoReturn.
In addition a version with a 64-bit GPR named PseudoReturn64 has been
added.
Instruction selection for a return matches RetRA, which is expanded post
register allocation to PseudoReturn/PseudoReturn64. During MipsAsmPrinter,
this PseudoReturn/PseudoReturn64 are emitted as:
- (JALR64 $zero, $rs) on MIPS64r6
- (JALR $zero, $rs) on MIPS32r6
- (JR_MM $rs) on microMIPS
- (JR $rs) otherwise
On MIPS32r6/MIPS64r6, 'jr $rs' is an alias for 'jalr $zero, $rs'. To aid
development and review (specifically, to ensure all cases of jr are
updated), these aliases are temporarily named 'r6.jr' instead of 'jr'.
A follow up patch will change them back to the correct mnemonic.
Added (JALR $zero, $rs) to MipsNaClELFStreamer's definition of an indirect
jump, and removed it from its definition of a call.
Note: I haven't accounted for MIPS64 in MipsNaClELFStreamer since it's
doesn't appear to account for any MIPS64-specifics.
The return instruction created as part of eh_return expansion is now expanded
using expandRetRA() so we use the right return instruction on MIPS32r6/MIPS64r6
('jalr $zero, $rs').
Also, fixed a misuse of isABI_N64() to detect 64-bit wide registers in
expandEhReturn().
Reviewers: jkolek, vmedic, mseaborn, zoran.jovanovic, dsanders
Reviewed By: dsanders
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D4268
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212604 91177308-0d34-0410-b5e6-96231b3b80d8
206 lines
5.6 KiB
LLVM
206 lines
5.6 KiB
LLVM
; Test all important variants of the 'ret' instruction.
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;
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; For non-void returns it is necessary to have something to return so we also
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; test constant generation here.
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;
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; We'll test pointer returns in a separate file since the relocation model
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; affects it and it's undesirable to repeat the non-pointer returns for each
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; relocation model.
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; RUN: llc -march=mips -mcpu=mips32 -asm-show-inst < %s | FileCheck %s -check-prefix=ALL -check-prefix=GPR32 -check-prefix=NO-MTHC1 -check-prefix=NOT-R6
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; RUN: llc -march=mips -mcpu=mips32r2 -asm-show-inst < %s | FileCheck %s -check-prefix=ALL -check-prefix=GPR32 -check-prefix=MTHC1 -check-prefix=NOT-R6
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; RUN: llc -march=mips -mcpu=mips32r6 -asm-show-inst < %s | FileCheck %s -check-prefix=ALL -check-prefix=GPR32 -check-prefix=MTHC1 -check-prefix=R6
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; RUN: llc -march=mips64 -mcpu=mips4 -asm-show-inst < %s | FileCheck %s -check-prefix=ALL -check-prefix=GPR64 -check-prefix=DMTC1 -check-prefix=NOT-R6
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; RUN: llc -march=mips64 -mcpu=mips64 -asm-show-inst < %s | FileCheck %s -check-prefix=ALL -check-prefix=GPR64 -check-prefix=DMTC1 -check-prefix=NOT-R6
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; RUN: llc -march=mips64 -mcpu=mips64r2 -asm-show-inst < %s | FileCheck %s -check-prefix=ALL -check-prefix=GPR64 -check-prefix=DMTC1 -check-prefix=NOT-R6
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; RUN: llc -march=mips64 -mcpu=mips64r6 -asm-show-inst < %s | FileCheck %s -check-prefix=ALL -check-prefix=GPR64 -check-prefix=DMTC1 -check-prefix=R6
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define void @ret_void() {
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; ALL-LABEL: ret_void:
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret void
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}
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define i8 @ret_i8() {
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; ALL-LABEL: ret_i8:
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; ALL-DAG: addiu $2, $zero, 3
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i8 3
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}
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define i16 @ret_i16_3() {
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; ALL-LABEL: ret_i16_3:
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; ALL-DAG: addiu $2, $zero, 3
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i16 3
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}
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define i16 @ret_i16_256() {
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; ALL-LABEL: ret_i16_256:
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; ALL-DAG: addiu $2, $zero, 256
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i16 256
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}
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define i16 @ret_i16_257() {
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; ALL-LABEL: ret_i16_257:
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; ALL-DAG: addiu $2, $zero, 257
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i16 257
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}
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define i32 @ret_i32_257() {
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; ALL-LABEL: ret_i32_257:
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; ALL-DAG: addiu $2, $zero, 257
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i32 257
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}
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define i32 @ret_i32_65536() {
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; ALL-LABEL: ret_i32_65536:
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; ALL-DAG: lui $2, 1
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i32 65536
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}
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define i32 @ret_i32_65537() {
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; ALL-LABEL: ret_i32_65537:
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; ALL: lui $[[T0:[0-9]+]], 1
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; ALL-DAG: ori $2, $[[T0]], 1
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i32 65537
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}
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define i64 @ret_i64_65537() {
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; ALL-LABEL: ret_i64_65537:
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; ALL: lui $[[T0:[0-9]+]], 1
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; GPR32-DAG: ori $3, $[[T0]], 1
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; GPR32-DAG: addiu $2, $zero, 0
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; GPR64-DAG: daddiu $2, $[[T0]], 1
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i64 65537
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}
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define i64 @ret_i64_281479271677952() {
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; ALL-LABEL: ret_i64_281479271677952:
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; ALL-DAG: lui $[[T0:[0-9]+]], 1
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; GPR32-DAG: ori $2, $[[T0]], 1
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; GPR32-DAG: addiu $3, $zero, 0
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; GPR64-DAG: daddiu $[[T1:[0-9]+]], $[[T0]], 1
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; GPR64-DAG: dsll $2, $[[T1]], 32
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i64 281479271677952
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}
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define i64 @ret_i64_281479271809026() {
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; ALL-LABEL: ret_i64_281479271809026:
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; GPR32-DAG: lui $[[T0:[0-9]+]], 1
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; GPR32-DAG: lui $[[T1:[0-9]+]], 2
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; GPR32-DAG: ori $2, $[[T0]], 1
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; GPR32-DAG: ori $3, $[[T1]], 2
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; GPR64-DAG: ori $[[T0:[0-9]+]], $zero, 32769
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; GPR64-DAG: dsll $[[T1:[0-9]+]], $[[T0]], 16
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; GPR64-DAG: daddiu $[[T0:[0-9]+]], $[[T0]], -32767
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; GPR64-DAG: dsll $[[T1:[0-9]+]], $[[T0]], 17
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; GPR64-DAG: daddiu $2, $[[T1]], 2
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret i64 281479271809026
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}
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define float @ret_float_0x0() {
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; ALL-LABEL: ret_float_0x0:
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; NO-MTHC1-DAG: mtc1 $zero, $f0
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; MTHC1-DAG: mtc1 $zero, $f0
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; DMTC-DAG: dmtc1 $zero, $f0
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret float 0x0000000000000000
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}
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define float @ret_float_0x3() {
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; ALL-LABEL: ret_float_0x3:
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; Use a constant pool
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; O32-DAG: lwc1 $f0, %lo($CPI
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; N64-DAG: lwc1 $f0, %got_ofst($CPI
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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; float constants are written as double constants
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ret float 0x36b8000000000000
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}
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define double @ret_double_0x0() {
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; ALL-LABEL: ret_double_0x0:
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; NO-MTHC1-DAG: mtc1 $zero, $f0
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; NO-MTHC1-DAG: mtc1 $zero, $f1
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; MTHC1-DAG: mtc1 $zero, $f0
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; MTHC1-DAG: mthc1 $zero, $f0
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; DMTC-DAG: dmtc1 $zero, $f0
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret double 0x0000000000000000
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}
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define double @ret_double_0x3() {
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; ALL-LABEL: ret_double_0x3:
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; Use a constant pool
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; O32-DAG: ldc1 $f0, %lo($CPI
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; N64-DAG: ldc1 $f0, %got_ofst($CPI
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; NOT-R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JR
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; R6-DAG: jr $ra # <MCInst #{{[0-9]+}} JALR
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ret double 0x0000000000000003
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}
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