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From: "chrbr at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/61195] New: single precision fmov does not need to switch mode Date: Thu, 15 May 2014 13:55:00 -0000 [thread overview] Message-ID: <bug-61195-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61195 Bug ID: 61195 Summary: single precision fmov does not need to switch mode Product: gcc Version: 4.10.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: chrbr at gcc dot gnu.org for SH4/SH2A the compiler forces a PR mode switch for the floating point moves: so float foo(float f) { return f; } compiles as: mov.l .L2,r1 lds.l @r1+,fpscr add #-4,r1 fmov fr4,fr0 add #4,r1 rts lds.l @r1+,fpscr .L3: .align 2 .L2: .long ___fpscr_values This is not necessary, since the prevailing mode for PR=0 is single precision (double precision would be set with SZ=1) so the function can be just be compiled as _foo: rts fmov fr4,fr0
next reply other threads:[~2014-05-15 13:55 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-05-15 13:55 chrbr at gcc dot gnu.org [this message] 2014-05-15 14:22 ` [Bug target/61195] " chrbr at gcc dot gnu.org 2014-05-19 8:05 ` chrbr at gcc dot gnu.org 2014-05-20 10:29 ` chrbr at gcc dot gnu.org
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