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tcg: Introduce paired register allocation

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There are several instances where we need to be able to
allocate a pair of registers to related inputs/outputs.
Add 'p' and 'm' register constraints for this, in order to
be able to allocate the even/odd register first or second.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-10-14 07:37:38 +11:00
parent 8940ea0d32
commit 29f5e92502
2 changed files with 378 additions and 48 deletions
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2
include/tcg/tcg.h
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@ -951,6 +951,8 @@ typedef struct TCGArgConstraint {
unsigned ct : 16;
unsigned alias_index : 4;
unsigned sort_index : 4;
unsigned pair_index : 4;
unsigned pair : 2; /* 0: none, 1: first, 2: second, 3: second alias */
bool oalias : 1;
bool ialias : 1;
bool newreg : 1;