http://llvm.org/bugs/show_bug.cgi?id=6071
Summary: MIPS backend error, missing argument passing in
generated code
Product: libraries
Version: 2.6
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Archive library
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=4071)
--> (http://llvm.org/bugs/attachment.cgi?id=4071)
C code
Please, assign this to the the correct component, in the backends in bugzilla,
there is no MIPS present.
For C code from some benchmark that calculates CRC compiled with web-site demo
frontend with no optimizations and then with llc -march=mips, incorrect code is
generated. (llvm v. 2.6).
Call in C code (crc.c):
crc = crc32buf(buf, 4);
is translated correctly to IR:
%1 = call i32 @crc32buf(i32* getelementptr ([4 x i32]* @buf, i32 0, i32 0), i32
4) nounwind
but then the MIPS backend generates following code:
main:
.frame $sp,48,$ra
.mask 0x80000000,-8
.fmask 0x00000000,0
.set noreorder
.cpload $25
.set nomacro
addiu $sp, $sp, -48
sw $ra, 40($sp)
.cprestore 16
sw $4, 20($sp)
sw $5, 24($sp)
sw $zero, 32($sp)
lw $4, %got(buf)($gp)
nop
lw $25, %call16(crc32buf)($gp)
nop
jalr $25 #call - buf poiter is in $4, value 4 should be in $5, but
#this assignement was not made
nop
...
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