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7169934: pow(x,y) or x64 computes incorrect result when x<0 and y is an odd integer

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Bad test for parity of y in pow(x,y) (c1, interpreter)

Reviewed-by: kvn, twisti
This commit is contained in:
Roland Westrelin 2012-05-21 09:46:02 +02:00
parent 100eb2036d
commit e975779565
1 changed files with 3 additions and 2 deletions
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5
hotspot/src/cpu/x86/vm/assembler_x86.cpp
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@ -6954,7 +6954,7 @@ void MacroAssembler::pow_or_exp(bool is_exp, int num_fpu_regs_in_use) {
tmp = rdx; tmp = rdx;
} }
Register tmp2 = rax; Register tmp2 = rax;
NOT_LP64(Register tmp3 = rcx;) Register tmp3 = rcx;
if (is_exp) { if (is_exp) {
// Stack: X // Stack: X
@ -7081,7 +7081,8 @@ void MacroAssembler::pow_or_exp(bool is_exp, int num_fpu_regs_in_use) {
#else #else
{ {
Label integer; Label integer;
shlq(tmp2, 1); mov(tmp3, tmp2); // preserve tmp2 for parity check below
shlq(tmp3, 1);
jcc(Assembler::carryClear, integer); jcc(Assembler::carryClear, integer);
jcc(Assembler::notZero, integer); jcc(Assembler::notZero, integer);
stop("integer indefinite value shouldn't be seen here"); stop("integer indefinite value shouldn't be seen here");