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[Qemu-devel] [PULL 09/24] target/arm: Split out vfp_expand_imm
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PULL 09/24] target/arm: Split out vfp_expand_imm |
Date: |
Tue, 16 Jan 2018 13:34:04 +0000 |
From: Richard Henderson <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Message-id: address@hidden
Signed-off-by: Peter Maydell <address@hidden>
---
target/arm/translate-a64.c | 44 ++++++++++++++++++++++++++++----------------
1 file changed, 28 insertions(+), 16 deletions(-)
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index ba94f7d..80ae019 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -4985,6 +4985,33 @@ static void disas_fp_3src(DisasContext *s, uint32_t insn)
}
}
+/* The imm8 encodes the sign bit, enough bits to represent an exponent in
+ * the range 01....1xx to 10....0xx, and the most significant 4 bits of
+ * the mantissa; see VFPExpandImm() in the v8 ARM ARM.
+ */
+static uint64_t vfp_expand_imm(int size, uint8_t imm8)
+{
+ uint64_t imm;
+
+ switch (size) {
+ case MO_64:
+ imm = (extract32(imm8, 7, 1) ? 0x8000 : 0) |
+ (extract32(imm8, 6, 1) ? 0x3fc0 : 0x4000) |
+ extract32(imm8, 0, 6);
+ imm <<= 48;
+ break;
+ case MO_32:
+ imm = (extract32(imm8, 7, 1) ? 0x8000 : 0) |
+ (extract32(imm8, 6, 1) ? 0x3e00 : 0x4000) |
+ (extract32(imm8, 0, 6) << 3);
+ imm <<= 16;
+ break;
+ default:
+ g_assert_not_reached();
+ }
+ return imm;
+}
+
/* Floating point immediate
* 31 30 29 28 24 23 22 21 20 13 12 10 9 5 4 0
* +---+---+---+-----------+------+---+------------+-------+------+------+
@@ -5008,22 +5035,7 @@ static void disas_fp_imm(DisasContext *s, uint32_t insn)
return;
}
- /* The imm8 encodes the sign bit, enough bits to represent
- * an exponent in the range 01....1xx to 10....0xx,
- * and the most significant 4 bits of the mantissa; see
- * VFPExpandImm() in the v8 ARM ARM.
- */
- if (is_double) {
- imm = (extract32(imm8, 7, 1) ? 0x8000 : 0) |
- (extract32(imm8, 6, 1) ? 0x3fc0 : 0x4000) |
- extract32(imm8, 0, 6);
- imm <<= 48;
- } else {
- imm = (extract32(imm8, 7, 1) ? 0x8000 : 0) |
- (extract32(imm8, 6, 1) ? 0x3e00 : 0x4000) |
- (extract32(imm8, 0, 6) << 3);
- imm <<= 16;
- }
+ imm = vfp_expand_imm(MO_32 + is_double, imm8);
tcg_res = tcg_const_i64(imm);
write_fp_dreg(s, rd, tcg_res);
--
2.7.4
- [Qemu-devel] [PULL 00/24] target-arm queue, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 10/24] target/arm: Add fp16 support to vfp_expand_imm, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 12/24] sdhci: remove dead code, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 03/24] hw/arm/virt: Add virt-2.12 machine type, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 07/24] hw/sd/ssi-sd: Reset SD card on controller reset, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 04/24] target/arm: Handle page table walk load failures correctly, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 19/24] sdhci: move MASK_TRNMOD with other SDHC_TRN* defines in "sd-internal.h", Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 09/24] target/arm: Split out vfp_expand_imm,
Peter Maydell <=
- [Qemu-devel] [PULL 15/24] sdhci: refactor common sysbus/pci realize() into sdhci_common_realize(), Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 06/24] hw/sd/milkymist-memcard: Reset SD card on controller reset, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 02/24] get_phys_addr_pmsav7: Support AP=0b111 for v7M, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 08/24] hw/sd/omap_mmc: Reset SD card on controller reset, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 05/24] hw/sd/pl181: Reset SD card on controller reset, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 13/24] sdhci: use DEFINE_SDHCI_COMMON_PROPERTIES() for common sysbus/pci properties, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 14/24] sdhci: refactor common sysbus/pci class_init() into sdhci_common_class_init(), Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 20/24] sdhci: rename the SDHC_CAPAB register, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 23/24] sdhci: fix the PCI device, using the PCI address space for DMA, Peter Maydell, 2018/01/16
- [Qemu-devel] [PULL 22/24] sdhci: Implement write method of ACMD12ERRSTS register, Peter Maydell, 2018/01/16