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[Qemu-devel] [PULL v2 09/13] tcg-s390: Use risbgz for andi
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PULL v2 09/13] tcg-s390: Use risbgz for andi |
Date: |
Fri, 5 Apr 2013 13:47:37 -0500 |
This is immediately usable by the tlb lookup code.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/s390/tcg-target.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 53 insertions(+), 5 deletions(-)
diff --git a/tcg/s390/tcg-target.c b/tcg/s390/tcg-target.c
index 203cbb5..2bab245 100644
--- a/tcg/s390/tcg-target.c
+++ b/tcg/s390/tcg-target.c
@@ -827,6 +827,15 @@ static void tcg_out_ld_abs(TCGContext *s, TCGType type,
TCGReg dest, void *abs)
tcg_out_ld(s, type, dest, dest, addr & 0xffff);
}
+static inline void tcg_out_risbg(TCGContext *s, TCGReg dest, TCGReg src,
+ int msb, int lsb, int ofs, int z)
+{
+ /* Format RIE-f */
+ tcg_out16(s, (RIE_RISBG & 0xff00) | (dest << 4) | src);
+ tcg_out16(s, (msb << 8) | (z << 7) | lsb);
+ tcg_out16(s, (ofs << 8) | (RIE_RISBG & 0xff));
+}
+
static void tgen_ext8s(TCGContext *s, TCGType type, TCGReg dest, TCGReg src)
{
if (facilities & FACILITY_EXT_IMM) {
@@ -940,6 +949,36 @@ static inline void tgen64_addi(TCGContext *s, TCGReg dest,
int64_t val)
}
+/* Accept bit patterns like these:
+ 0....01....1
+ 1....10....0
+ 1..10..01..1
+ 0..01..10..0
+ Copied from gcc sources. */
+static inline bool risbg_mask(uint64_t c)
+{
+ uint64_t lsb;
+ /* We don't change the number of transitions by inverting,
+ so make sure we start with the LSB zero. */
+ if (c & 1) {
+ c = ~c;
+ }
+ /* Reject all zeros or all ones. */
+ if (c == 0) {
+ return false;
+ }
+ /* Find the first transition. */
+ lsb = c & -c;
+ /* Invert to look for a second transition. */
+ c = ~c;
+ /* Erase the first transition. */
+ c &= -lsb;
+ /* Find the second transition, if any. */
+ lsb = c & -c;
+ /* Match if all the bits are 1's, or if c is zero. */
+ return c == -lsb;
+}
+
static void tgen_andi(TCGContext *s, TCGType type, TCGReg dest, uint64_t val)
{
static const S390Opcode ni_insns[4] = {
@@ -986,6 +1025,19 @@ static void tgen_andi(TCGContext *s, TCGType type, TCGReg
dest, uint64_t val)
}
}
}
+ if ((facilities & FACILITY_GEN_INST_EXT) && risbg_mask(val)) {
+ int msb, lsb;
+ if ((val & 0x8000000000000001ull) == 0x8000000000000001ull) {
+ /* Achieve wraparound by swapping msb and lsb. */
+ msb = 63 - ctz64(~val);
+ lsb = clz64(~val) + 1;
+ } else {
+ msb = clz64(val);
+ lsb = 63 - ctz64(val);
+ }
+ tcg_out_risbg(s, dest, dest, msb, lsb, 0, 1);
+ return;
+ }
/* Fall back to loading the constant. */
tcg_out_movi(s, type, TCG_TMP0, val);
@@ -1142,11 +1194,7 @@ static void tgen_deposit(TCGContext *s, TCGReg dest,
TCGReg src,
{
int lsb = (63 - ofs);
int msb = lsb - (len - 1);
-
- /* Format RIE-f */
- tcg_out16(s, (RIE_RISBG & 0xff00) | (dest << 4) | src);
- tcg_out16(s, (msb << 8) | lsb);
- tcg_out16(s, (ofs << 8) | (RIE_RISBG & 0xff));
+ tcg_out_risbg(s, dest, src, msb, lsb, ofs, 0);
}
static void tgen_gotoi(TCGContext *s, int cc, tcg_target_long dest)
--
1.8.1.4
- [Qemu-devel] [PULL v2 00/13] tcg-s390 updates, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 02/13] tcg-s390: Properly allocate a stack frame., Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 01/13] tcg-s390: Fix movi, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 04/13] tcg-s390: Implement add2/sub2 opcodes, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 03/13] tcg-s390: Remove useless preprocessor conditions, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 07/13] tcg-s390: Implement deposit opcodes, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 05/13] tcg-s390: Implement mulu2_i64 opcode, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 06/13] tcg-s390: Implement movcond opcodes, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 09/13] tcg-s390: Use risbgz for andi,
Richard Henderson <=
- [Qemu-devel] [PULL v2 08/13] tcg-s390: Remove constraint letters for and, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 11/13] tcg-s390: Use load-address for addition, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 12/13] tcg-s390: Use all 20 bits of the offset in tcg_out_mem, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 10/13] tcg-s390: Cleanup argument shuffling fixme in softmmu code, Richard Henderson, 2013/04/05
- [Qemu-devel] [PULL v2 13/13] tcg-s390: Fix merge error in tgen_brcond, Richard Henderson, 2013/04/05
- Re: [Qemu-devel] [PULL v2 00/13] tcg-s390 updates, Richard Henderson, 2013/04/09
- Re: [Qemu-devel] [PULL v2 00/13] tcg-s390 updates, Aurelien Jarno, 2013/04/13