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[Qemu-devel] [PATCH 06/26] tcg-aarch64: Special case small constants in
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 06/26] tcg-aarch64: Special case small constants in tcg_out_movi |
Date: |
Fri, 14 Mar 2014 19:48:32 -0700 |
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/aarch64/tcg-target.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c
index 0f23e43..417f51a 100644
--- a/tcg/aarch64/tcg-target.c
+++ b/tcg/aarch64/tcg-target.c
@@ -577,6 +577,16 @@ static void tcg_out_movi(TCGContext *s, TCGType type,
TCGReg rd,
}
ivalue = ~svalue;
+ /* Speed things up by handling the common case of small positive
+ and negative values specially. */
+ if ((value & ~0xffffull) == 0) {
+ tcg_out_insn(s, 3405, MOVZ, type, rd, value, 0);
+ return;
+ } else if ((ivalue & ~0xffffull) == 0) {
+ tcg_out_insn(s, 3405, MOVN, type, rd, ivalue, 0);
+ return;
+ }
+
/* Check for bitfield immediates. For the benefit of 32-bit quantities,
use the sign-extended value. That lets us match rotated values such
as 0xff0000ff with the same 64-bit logic matching 0xffffffffff0000ff. */
--
1.8.5.3
- Re: [Qemu-devel] [PATCH 01/26] tcg-aarch64: Properly detect SIGSEGV writes, (continued)
- [Qemu-devel] [PATCH 02/26] tcg-aarch64: Use intptr_t apropriately, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 03/26] tcg-aarch64: Use TCGType and TCGMemOp constants, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 04/26] tcg-aarch64: Use MOVN in tcg_out_movi, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 06/26] tcg-aarch64: Special case small constants in tcg_out_movi,
Richard Henderson <=
- [Qemu-devel] [PATCH 07/26] tcg-aarch64: Use adrp in tcg_out_movi, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 05/26] tcg-aarch64: Use ORRI in tcg_out_movi, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 08/26] tcg-aarch64: Use symbolic names for branches, Richard Henderson, 2014/03/14
- [Qemu-devel] [PATCH 09/26] tcg-aarch64: Create tcg_out_brcond, Richard Henderson, 2014/03/14