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70926d1510
Summary: When expanding the PseudoTail in expandFunctionCall() we were using X6 to save the return address. Since this is a tail call the return address is not needed, this patch replaces it with X0 to be ignored. This matches the behaviour listed in the ISA V2.2 document page 110. tail offset -----> jalr x0, x6, offset GCC exhibits the same behavior. Reviewers: apazos, asb, mgrang Reviewed By: asb Subscribers: rbar, johnrusso, simoncook, niosHD, kito-cheng, shiva0217, zzheng, edward-jones, rogfer01 Differential Revision: https://reviews.llvm.org/D48343 llvm-svn: 335239
48 lines
1.3 KiB
ArmAsm
48 lines
1.3 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple riscv32 < %s \
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# RUN: | llvm-objdump -d - | FileCheck -check-prefix=INSTR %s
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# RUN: llvm-mc -filetype=obj -triple riscv32 < %s \
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# RUN: | llvm-readobj -r | FileCheck -check-prefix=RELOC %s
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# RUN: llvm-mc -triple riscv32 < %s -show-encoding \
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# RUN: | FileCheck -check-prefix=FIXUP %s
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# RUN: llvm-mc -filetype=obj -triple riscv64 < %s \
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# RUN: | llvm-objdump -d - | FileCheck -check-prefix=INSTR %s
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# RUN: llvm-mc -filetype=obj -triple riscv64 < %s \
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# RUN: | llvm-readobj -r | FileCheck -check-prefix=RELOC %s
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# RUN: llvm-mc -triple riscv64 < %s -show-encoding \
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# RUN: | FileCheck -check-prefix=FIXUP %s
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.long foo
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tail foo
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# RELOC: R_RISCV_CALL foo 0x0
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# INSTR: auipc t1, 0
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# INSTR: jr t1
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# FIXUP: fixup A - offset: 0, value: foo, kind:
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tail bar
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# RELOC: R_RISCV_CALL bar 0x0
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# INSTR: auipc t1, 0
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# INSTR: jr t1
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# FIXUP: fixup A - offset: 0, value: bar, kind:
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# Ensure that tail calls to functions whose names coincide with register names
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# work.
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tail zero
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# RELOC: R_RISCV_CALL zero 0x0
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# INSTR: auipc t1, 0
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# INSTR: jr t1
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# FIXUP: fixup A - offset: 0, value: zero, kind:
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tail f1
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# RELOC: R_RISCV_CALL f1 0x0
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# INSTR: auipc t1, 0
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# INSTR: jr t1
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# FIXUP: fixup A - offset: 0, value: f1, kind:
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tail ra
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# RELOC: R_RISCV_CALL ra 0x0
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# INSTR: auipc t1, 0
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# INSTR: jr t1
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# FIXUP: fixup A - offset: 0, value: ra, kind:
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