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
Hi Amara, could you take a look? Thanks.
GISel big endian will be disabled until PR26161 is resolved.