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Commenting register usage in MIPS.

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Review URL: http://codereview.chromium.org/7775007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9033 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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yangguo@chromium.org 2011-08-29 08:41:39 +00:00
parent a2deb8af0b
commit ab03dff745
1 changed files with 19 additions and 19 deletions
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38
src/mips/assembler-mips.h
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@ -127,38 +127,38 @@ struct Register {
const Register no_reg = { -1 };
const Register zero_reg = { 0 };
const Register at = { 1 };
const Register v0 = { 2 };
const Register v1 = { 3 };
const Register a0 = { 4 };
const Register zero_reg = { 0 }; // Always zero.
const Register at = { 1 }; // at: Reserved for synthetic instructions.
const Register v0 = { 2 }; // v0, v1: Used when returning multiple values
const Register v1 = { 3 }; // from subroutines.
const Register a0 = { 4 }; // a0 - a4: Used to pass non-FP parameters.
const Register a1 = { 5 };
const Register a2 = { 6 };
const Register a3 = { 7 };
const Register t0 = { 8 };
const Register t1 = { 9 };
const Register t2 = { 10 };
const Register t0 = { 8 }; // t0 - t9: Can be used without reservation, act
const Register t1 = { 9 }; // as temporary registers and are allowed to
const Register t2 = { 10 }; // be destroyed by subroutines.
const Register t3 = { 11 };
const Register t4 = { 12 };
const Register t5 = { 13 };
const Register t6 = { 14 };
const Register t7 = { 15 };
const Register s0 = { 16 };
const Register s1 = { 17 };
const Register s2 = { 18 };
const Register s3 = { 19 };
const Register s4 = { 20 };
const Register s0 = { 16 }; // s0 - s7: Subroutine register variables.
const Register s1 = { 17 }; // Subroutines that write to these registers
const Register s2 = { 18 }; // must restore their values before exiting so
const Register s3 = { 19 }; // that the caller can expect the values to be
const Register s4 = { 20 }; // preserved.
const Register s5 = { 21 };
const Register s6 = { 22 };
const Register s7 = { 23 };
const Register t8 = { 24 };
const Register t9 = { 25 };
const Register k0 = { 26 };
const Register k1 = { 27 };
const Register gp = { 28 };
const Register sp = { 29 };
const Register s8_fp = { 30 };
const Register ra = { 31 };
const Register k0 = { 26 }; // k0, k1: Reserved for system calls and
const Register k1 = { 27 }; // interrupt handlers.
const Register gp = { 28 }; // gp: Reserved.
const Register sp = { 29 }; // sp: Stack pointer.
const Register s8_fp = { 30 }; // fp: Frame pointer.
const Register ra = { 31 }; // ra: Return address pointer.
int ToNumber(Register reg);