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[Qemu-devel] [PATCH] ppc: Fix emulated INFINITY and NAN conversions
From: |
Paul A. Clarke |
Subject: |
[Qemu-devel] [PATCH] ppc: Fix emulated INFINITY and NAN conversions |
Date: |
Mon, 19 Aug 2019 14:19:48 -0500 |
From: "Paul A. Clarke" <address@hidden>
helper_todouble() was not properly converting INFINITY from 32 bit
float to 64 bit double.
(Normalized operand conversion is unchanged, other than indentation.)
Signed-off-by: Paul A. Clarke <address@hidden>
---
target/ppc/fpu_helper.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index 23b9c97..52bcda2 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -58,10 +58,17 @@ uint64_t helper_todouble(uint32_t arg)
uint64_t ret;
if (likely(abs_arg >= 0x00800000)) {
- /* Normalized operand, or Inf, or NaN. */
- ret = (uint64_t)extract32(arg, 30, 2) << 62;
- ret |= ((extract32(arg, 30, 1) ^ 1) * (uint64_t)7) << 59;
- ret |= (uint64_t)extract32(arg, 0, 30) << 29;
+ if (unlikely(extract32(arg, 23, 8) == 0xff)) {
+ /* Inf or NAN. */
+ ret = (uint64_t)extract32(arg, 31, 1) << 63;
+ ret |= (uint64_t)0x7ff << 52;
+ ret |= (uint64_t)extract32(arg, 0, 23) << 29;
+ } else {
+ /* Normalized operand. */
+ ret = (uint64_t)extract32(arg, 30, 2) << 62;
+ ret |= ((extract32(arg, 30, 1) ^ 1) * (uint64_t)7) << 59;
+ ret |= (uint64_t)extract32(arg, 0, 30) << 29;
+ }
} else {
/* Zero or Denormalized operand. */
ret = (uint64_t)extract32(arg, 31, 1) << 63;
--
1.8.3.1
- [Qemu-devel] [PATCH] ppc: Fix emulated INFINITY and NAN conversions,
Paul A. Clarke <=