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X86: Don't clobber the original dividend when doing signed divide.

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This commit is contained in:
Gabe Black 2009-08-09 01:01:18 -07:00
parent 3b07a5829d
commit bbf117b20e
1 changed files with 18 additions and 26 deletions
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44
src/arch/x86/isa/insts/general_purpose/arithmetic/multiply_and_divide.py
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@ -388,7 +388,6 @@ def macroop IDIV_B_R
sub t2, t2, t4
#Find the sign of the divisor
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, reg, 1, flags=(ECF,), dataSize=1
# Negate divisor
@ -397,7 +396,6 @@ def macroop IDIV_B_R
mov t3, t3, reg, flags=(nCECF,), dataSize=1
#Find the sign of the dividend
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, ah, 1, flags=(ECF,), dataSize=1
# Put the dividend's absolute value into t1 and t2
@ -440,7 +438,7 @@ divLoopTop:
mov t5, t5, t4, (CECF,), dataSize=1
# Check the sign of the divisor
slli t0, t3, 1, flags=(ECF,), dataSize=1
slli t0, reg, 1, flags=(ECF,), dataSize=1
# Negate the (possibly already negated) quotient
sub t4, t0, t5, dataSize=1
@ -458,19 +456,17 @@ def macroop IDIV_B_M
sub t2, t0, ah, dataSize=1
sub t2, t2, t4
ld t3, seg, sib, disp
ld t8, seg, sib, disp
#Find the sign of the divisor
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, t3, 1, flags=(ECF,), dataSize=1
# Negate divisor
sub t4, t0, t3, dataSize=1
sub t3, t0, t8, dataSize=1
# Put the divisor's absolute value into t3
mov t3, t3, t4, flags=(CECF,), dataSize=1
mov t3, t3, t8, flags=(nCECF,), dataSize=1
#Find the sign of the dividend
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, ah, 1, flags=(ECF,), dataSize=1
# Put the dividend's absolute value into t1 and t2
@ -513,7 +509,7 @@ divLoopTop:
mov t5, t5, t4, (CECF,), dataSize=1
# Check the sign of the divisor
slli t0, t3, 1, flags=(ECF,), dataSize=1
slli t0, t8, 1, flags=(ECF,), dataSize=1
# Negate the (possibly already negated) quotient
sub t4, t0, t5, dataSize=1
@ -532,19 +528,17 @@ def macroop IDIV_B_P
sub t2, t2, t4
rdip t7
ld t3, seg, riprel, disp
ld t8, seg, riprel, disp
#Find the sign of the divisor
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, t3, 1, flags=(ECF,), dataSize=1
# Negate divisor
sub t4, t0, t3, dataSize=1
sub t3, t0, t8, dataSize=1
# Put the divisor's absolute value into t3
mov t3, t3, t4, flags=(CECF,), dataSize=1
mov t3, t3, t8, flags=(nCECF,), dataSize=1
#Find the sign of the dividend
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, ah, 1, flags=(ECF,), dataSize=1
# Put the dividend's absolute value into t1 and t2
@ -587,7 +581,7 @@ divLoopTop:
mov t5, t5, t4, (CECF,), dataSize=1
# Check the sign of the divisor
slli t0, t3, 1, flags=(ECF,), dataSize=1
slli t0, t8, 1, flags=(ECF,), dataSize=1
# Negate the (possibly already negated) quotient
sub t4, t0, t5, dataSize=1
@ -610,7 +604,6 @@ def macroop IDIV_R
sub t2, t2, t4
#Find the sign of the divisor
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, reg, 1, flags=(ECF,)
# Negate divisor
@ -619,7 +612,6 @@ def macroop IDIV_R
mov t3, t3, reg, flags=(nCECF,)
#Find the sign of the dividend
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, rdx, 1, flags=(ECF,)
# Put the dividend's absolute value into t1 and t2
@ -664,7 +656,7 @@ divLoopTop:
mov t5, t5, t4, (CECF,)
# Check the sign of the divisor
slli t0, t3, 1, flags=(ECF,)
slli t0, reg, 1, flags=(ECF,)
# Negate the (possibly already negated) quotient
sub t4, t0, t5
@ -682,16 +674,16 @@ def macroop IDIV_M
sub t2, t0, rdx
sub t2, t2, t4
ld t3, seg, sib, disp
ld t8, seg, sib, disp
#Find the sign of the divisor
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, t3, 1, flags=(ECF,)
# Negate divisor
sub t4, t0, t3
sub t3, t0, t8
# Put the divisor's absolute value into t3
mov t3, t3, t4, flags=(CECF,)
mov t3, t3, t8, flags=(nCECF,)
#Find the sign of the dividend
#FIXME!!! This depends on shifts setting the carry flag correctly.
@ -739,7 +731,7 @@ divLoopTop:
mov t5, t5, t4, (CECF,)
# Check the sign of the divisor
slli t0, t3, 1, flags=(ECF,)
slli t0, t8, 1, flags=(ECF,)
# Negate the (possibly already negated) quotient
sub t4, t0, t5
@ -758,16 +750,16 @@ def macroop IDIV_P
sub t2, t2, t4
rdip t7
ld t3, seg, riprel, disp
ld t8, seg, riprel, disp
#Find the sign of the divisor
#FIXME!!! This depends on shifts setting the carry flag correctly.
slli t0, t3, 1, flags=(ECF,)
# Negate divisor
sub t4, t0, t3
sub t3, t0, t8
# Put the divisor's absolute value into t3
mov t3, t3, t4, flags=(CECF,)
mov t3, t3, t4, flags=(nCECF,)
#Find the sign of the dividend
#FIXME!!! This depends on shifts setting the carry flag correctly.
@ -815,7 +807,7 @@ divLoopTop:
mov t5, t5, t4, (CECF,)
# Check the sign of the divisor
slli t0, t3, 1, flags=(ECF,)
slli t0, t8, 1, flags=(ECF,)
# Negate the (possibly already negated) quotient
sub t4, t0, t5