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tcg/i386: Improve TSTNE/TESTEQ vs powers of two

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Use "test x,x" when the bit is one of the 4 sign bits.
Use "bt imm,x" otherwise.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-01-10 09:15:07 +11:00
parent 303214aac9
commit d3d1c30c63
3 changed files with 53 additions and 8 deletions
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tcg/i386/tcg-target-con-str.h
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@ -28,5 +28,6 @@ REGS('s', ALL_BYTEL_REGS & ~SOFTMMU_RESERVE_REGS) /* qemu_st8_i32 data */
*/
CONST('e', TCG_CT_CONST_S32)
CONST('I', TCG_CT_CONST_I32)
CONST('T', TCG_CT_CONST_TST)
CONST('W', TCG_CT_CONST_WSZ)
CONST('Z', TCG_CT_CONST_U32)