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go / go / 1f4f2d0d39ceac483f3d42eb25ec992cdaf257f3
commit1f4f2d0d39ceac483f3d42eb25ec992cdaf257f3[log] [tgz]
authorMichael Munday <munday@ca.ibm.com>Wed May 04 14:26:46 2016 -0400
committerMichael Munday <munday@ca.ibm.com>Wed May 04 23:23:58 2016 +0000
tree44cefa163a11afb4894bc524adb7a0a60dc2c67e
parent3747c00923b140847f5d8f7978e672fa79e3ec37 [diff]
cmd/compile: fix uint64 to float casts on ppc64

Adds the FCFIDU instruction and uses it instead of the FCFID
instruction for unsigned integer to float casts. This change means
that unsigned integers do not have to be cast to signed integers
before being cast to a floating point value. Therefore it is no
longer necessary to insert instructions to detect and fix
values that overflow int64.

The previous code generating the uint64 to int64 cast handled
overflow by truncating the uint64 value. This truncation can
change the result of the rounding performed by the integer to
float cast.

The FCFIDU instruction was added in Power ISA 2.06B.

Fixes #15539.

Change-Id: Ia37a9631293eff91032d4cd9a9bec759d2142437
Reviewed-on: https://go-review.googlesource.com/22772
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
6 files changed
tree: 44cefa163a11afb4894bc524adb7a0a60dc2c67e
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
README.md

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