[PULL 13/29] tcg/ppc: Disable TCG_REG_TB for Power9/Power10

Richard Henderson posted 29 patches 1 year, 1 month ago
Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Eduardo Habkost <eduardo@habkost.net>, WANG Xuerui <git@xen0n.name>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Aurelien Jarno <aurelien@aurel32.net>, Huacai Chen <chenhuacai@kernel.org>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <Alistair.Francis@wdc.com>
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[PULL 13/29] tcg/ppc: Disable TCG_REG_TB for Power9/Power10
Posted by Richard Henderson 1 year, 1 month ago
This appears to slightly improve performance on power9/10.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/ppc/tcg-target.c.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index 6496f76e41..c31da4da9d 100644
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -83,7 +83,7 @@
 #define TCG_VEC_TMP2    TCG_REG_V1
 
 #define TCG_REG_TB     TCG_REG_R31
-#define USE_REG_TB     (TCG_TARGET_REG_BITS == 64)
+#define USE_REG_TB     (TCG_TARGET_REG_BITS == 64 && !have_isa_3_00)
 
 /* Shorthand for size of a pointer.  Avoid promotion to unsigned.  */
 #define SZP  ((int)sizeof(void *))
-- 
2.34.1