#2016: GHC generates bad code for pointer manipulations from .cmm
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Reporter: wb.kloke | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 6.8.2
Severity: major | Resolution: duplicate
Keywords: | Difficulty: Unknown
Testcase: | Architecture: x86_64 (amd64)
Os: FreeBSD |
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Changes (by simonmar):
* status: new => closed
* resolution: => duplicate
Comment:
I strongly suspect you are experiencing another symptom of #1989. The
code is compiled correctly for me:
{{{
~/builds/testing/rts > make StgStdThunks.s HC=../compiler/stage2/ghc-
inplace
../compiler/stage2/ghc-inplace -Werror -H64m -Onot -fasm -optc-O2
-I../includes -I. -Iparallel -Ism -DCOMPILING_RTS -package-name rts
-static -I../gmp/gmpbuild -I. -#include HCIncludes.h -dcmm-lint -S
StgStdThunks.cmm -o StgStdThunks.s
~/builds/testing/rts > head -50 StgStdThunks.s
.text
.align 8
.quad 0
.quad 34
.globl stg_sel_ret_0_upd_info
.type stg_sel_ret_0_upd_info, @object
stg_sel_ret_0_upd_info:
.Lcg:
movq %rbx,%rax
andq $-8,%rax
movq 8(%rax),%rbx
addq $8,%rbp
.Lc3:
testq $7,%rbx
jne .Lce
.Lcd:
movq (%rbx),%rax
movslq -8(%rax),%rcx
jmp *.Lnea(,%rcx,8)
.Lcb:
movq 8(%rbx),%rbx
jmp .Lc3
.Lca:
jmp *(%rbp)
.Lcc:
jmp *%rax
.Lce:
jmp *(%rbp)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2016#comment:1>
GHC <http://www.haskell.org/ghc/>
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