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[Qemu-devel] [PATCH 7/7] tcg: Streamline movcond_i64 using movcond_i32
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 7/7] tcg: Streamline movcond_i64 using movcond_i32 |
Date: |
Fri, 21 Sep 2012 10:13:40 -0700 |
When movcond_i32 is available we can further reduce the generated
op count from 12 to 6, and the generated code size on i686 from
88 to 74 bytes.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/tcg-op.h | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h
index 3e375ea..0145a09 100644
--- a/tcg/tcg-op.h
+++ b/tcg/tcg-op.h
@@ -2147,16 +2147,24 @@ static inline void tcg_gen_movcond_i64(TCGCond cond,
TCGv_i64 ret,
tcg_gen_op6i_i32(INDEX_op_setcond2_i32, t0,
TCGV_LOW(c1), TCGV_HIGH(c1),
TCGV_LOW(c2), TCGV_HIGH(c2), cond);
- tcg_gen_neg_i32(t0, t0);
- tcg_gen_and_i32(t1, TCGV_LOW(v1), t0);
- tcg_gen_andc_i32(TCGV_LOW(ret), TCGV_LOW(v2), t0);
- tcg_gen_or_i32(TCGV_LOW(ret), TCGV_LOW(ret), t1);
+ if (TCG_TARGET_HAS_movcond_i32) {
+ tcg_gen_movi_i32(t1, 0);
+ tcg_gen_movcond_i32(TCG_COND_NE, TCGV_LOW(ret), t0, t1,
+ TCGV_LOW(v1), TCGV_LOW(v2));
+ tcg_gen_movcond_i32(TCG_COND_NE, TCGV_HIGH(ret), t0, t1,
+ TCGV_HIGH(v1), TCGV_HIGH(v2));
+ } else {
+ tcg_gen_neg_i32(t0, t0);
- tcg_gen_and_i32(t1, TCGV_HIGH(v1), t0);
- tcg_gen_andc_i32(TCGV_HIGH(ret), TCGV_HIGH(v2), t0);
- tcg_gen_or_i32(TCGV_HIGH(ret), TCGV_HIGH(ret), t1);
+ tcg_gen_and_i32(t1, TCGV_LOW(v1), t0);
+ tcg_gen_andc_i32(TCGV_LOW(ret), TCGV_LOW(v2), t0);
+ tcg_gen_or_i32(TCGV_LOW(ret), TCGV_LOW(ret), t1);
+ tcg_gen_and_i32(t1, TCGV_HIGH(v1), t0);
+ tcg_gen_andc_i32(TCGV_HIGH(ret), TCGV_HIGH(v2), t0);
+ tcg_gen_or_i32(TCGV_HIGH(ret), TCGV_HIGH(ret), t1);
+ }
tcg_temp_free_i32(t0);
tcg_temp_free_i32(t1);
} else {
--
1.7.11.4
- [Qemu-devel] [PATCH v2 0/7] tcg: movcond, Richard Henderson, 2012/09/21
- [Qemu-devel] [PATCH 2/7] target-alpha: Use movcond, Richard Henderson, 2012/09/21
- [Qemu-devel] [PATCH 5/7] tcg: Optimize two-address commutative operations, Richard Henderson, 2012/09/21
- [Qemu-devel] [PATCH 6/7] tcg: Streamline movcond_i64 using 32-bit arithmetic, Richard Henderson, 2012/09/21
- Re: [Qemu-devel] [PATCH v2 0/7] tcg: movcond, Aurelien Jarno, 2012/09/21
- Re: [Qemu-devel] [PATCH v2 0/7] tcg: movcond (ppc32 version), malc, 2012/09/21