https://bugs.llvm.org/show_bug.cgi?id=35361
Bug ID: 35361
Summary: [GlobalISel][AArch64] Calling convention for small
arguments passed on stack incorrect on big-endian
targets
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: GlobalISel
Assignee: unassignedb...@nondot.org
Reporter: oliver.stann...@arm.com
CC: llvm-bugs@lists.llvm.org
Global-isel generates incorrect code when targeting big-endian AArch64 for this
code:
int foo(int x0, int x1, int x2, int x3, int x4, int x5, int x6, int x7,
int stack1) {
return stack1;
}
int main() {
int ret = foo(0,1,2,3,4,5,6,7,8);
printf("%d\n", ret);
}
Global isel thinks that the incoming value of stack1 is stored in bytes [0,4)
above SP, but for big-endian targets this should be in bytes [4,8):
// /work/llvm/build/bin/clang --target=aarch64-arm-none-eabi -march=armv8-a -c
callees.cpp -O0 -Wall -std=c++11 -mllvm -global-isel=true -mllvm
-global-isel-abort=0 -mbig-endian -o - -S
_Z3fooiiiiiiiii: // @_Z3fooiiiiiiiii
// BB#0: // %entry
sub sp, sp, #48 // =48
ldr w8, [sp, #48] // <= Should be [sp, #52]
str w0, [sp, #44]
str w1, [sp, #40]
str w2, [sp, #36]
str w3, [sp, #32]
str w4, [sp, #28]
str w5, [sp, #24]
str w6, [sp, #20]
str w7, [sp, #16]
str w8, [sp, #12]
ldr w0, [sp, #12]
add sp, sp, #48 // =48
ret
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