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[Qemu-devel] [PATCH v2 17/17] target-alpha: Rewrite helper_zapnot
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v2 17/17] target-alpha: Rewrite helper_zapnot |
Date: |
Tue, 12 May 2015 10:39:47 -0700 |
The extract signed single bitfield produces significantly
smaller code on x86_64.
Signed-off-by: Richard Henderson <address@hidden>
---
target-alpha/int_helper.c | 30 ++++++++++++------------------
1 file changed, 12 insertions(+), 18 deletions(-)
diff --git a/target-alpha/int_helper.c b/target-alpha/int_helper.c
index 8e4537f..c023fa1 100644
--- a/target-alpha/int_helper.c
+++ b/target-alpha/int_helper.c
@@ -37,31 +37,25 @@ uint64_t helper_cttz(uint64_t arg)
return ctz64(arg);
}
-static inline uint64_t byte_zap(uint64_t op, uint8_t mskb)
+uint64_t helper_zapnot(uint64_t val, uint64_t mskb)
{
uint64_t mask;
- mask = 0;
- mask |= ((mskb >> 0) & 1) * 0x00000000000000FFULL;
- mask |= ((mskb >> 1) & 1) * 0x000000000000FF00ULL;
- mask |= ((mskb >> 2) & 1) * 0x0000000000FF0000ULL;
- mask |= ((mskb >> 3) & 1) * 0x00000000FF000000ULL;
- mask |= ((mskb >> 4) & 1) * 0x000000FF00000000ULL;
- mask |= ((mskb >> 5) & 1) * 0x0000FF0000000000ULL;
- mask |= ((mskb >> 6) & 1) * 0x00FF000000000000ULL;
- mask |= ((mskb >> 7) & 1) * 0xFF00000000000000ULL;
-
- return op & ~mask;
-}
+ mask = sextract64(mskb, 0, 1) & 0x00000000000000fful;
+ mask |= sextract64(mskb, 1, 1) & 0x000000000000ff00ul;
+ mask |= sextract64(mskb, 2, 1) & 0x0000000000ff0000ul;
+ mask |= sextract64(mskb, 3, 1) & 0x00000000ff000000ul;
+ mask |= sextract64(mskb, 4, 1) & 0x000000ff00000000ul;
+ mask |= sextract64(mskb, 5, 1) & 0x0000ff0000000000ul;
+ mask |= sextract64(mskb, 6, 1) & 0x00ff000000000000ul;
+ mask |= sextract64(mskb, 7, 1) & 0xff00000000000000ul;
-uint64_t helper_zap(uint64_t val, uint64_t mask)
-{
- return byte_zap(val, mask);
+ return val & mask;
}
-uint64_t helper_zapnot(uint64_t val, uint64_t mask)
+uint64_t helper_zap(uint64_t val, uint64_t mask)
{
- return byte_zap(val, ~mask);
+ return helper_zapnot(val, ~mask);
}
uint64_t helper_cmpbge(uint64_t op1, uint64_t op2)
--
2.1.0
- [Qemu-devel] [PATCH v2 06/17] target-alpha: Set fpcr_exc_status even for disabled exceptions, (continued)
- [Qemu-devel] [PATCH v2 06/17] target-alpha: Set fpcr_exc_status even for disabled exceptions, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 03/17] target-alpha: Forget installed round mode after MT_FPCR, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 07/17] target-alpha: Set EXC_M_SWC for exceptions from /S insns, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 09/17] target-alpha: Fix cvttq vs large integers, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 08/17] target-alpha: Raise IOV from CVTTQ, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 11/17] target-alpha: Fix integer overflow checking insns, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 12/17] target-alpha: Implement WH64EN, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 10/17] target-alpha: Fix cvttq vs inf, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 13/17] target-alpha: Disallow literal operand to 1C.30 to 1C.37, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 14/17] target-alpha: Raise EXC_M_INV properly for fp inputs, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 17/17] target-alpha: Rewrite helper_zapnot,
Richard Henderson <=
- [Qemu-devel] [PATCH v2 15/17] target-alpha: Suppress underflow from CVTTQ if DNZ, Richard Henderson, 2015/05/12
- [Qemu-devel] [PATCH v2 16/17] target-alpha: Raise IOV from CVTQL, Richard Henderson, 2015/05/12