https://gcc.gnu.org/g:c6141ad24f73cf1771e33c7d7edf1d80d8df70b8
commit r14-10175-gc6141ad24f73cf1771e33c7d7edf1d80d8df70b8 Author: Georg-Johann Lay <a...@gjlay.de> Date: Fri May 3 18:47:50 2024 +0200 AVR: ipa/92606 - Don't optimize PROGMEM data against non-PROGMEM. ipa/92606: Inter-procedural analysis optimizes data across address-spaces and PROGMEM. As of v14, the PROGMEM part is still not fixed (and there is still no target hook as proposed in PR92932). Just disable respective bogus optimization. PR ipa/92606 gcc/ * config/avr/avr.cc (avr_option_override): Set flag_ipa_icf_variables = 0. gcc/testsuite/ * gcc.target/avr/torture/pr92606.c: New test. (cherry picked from commit 08e752e72363ae7fd5a5fcb70913a0f7b240387b) Diff: --- gcc/config/avr/avr.cc | 6 +++ gcc/testsuite/gcc.target/avr/torture/pr92606.c | 57 ++++++++++++++++++++++++++ 2 files changed, 63 insertions(+) diff --git a/gcc/config/avr/avr.cc b/gcc/config/avr/avr.cc index 510e4cea19f..74924ab0565 100644 --- a/gcc/config/avr/avr.cc +++ b/gcc/config/avr/avr.cc @@ -1140,6 +1140,12 @@ avr_option_override (void) if (targetm.addr_space.zero_address_valid (ADDR_SPACE_GENERIC)) flag_delete_null_pointer_checks = 0; + /* PR ipa/92606: Inter-procedural analysis optimizes data across + address-spaces and PROGMEM. As of v14, the PROGMEM part is + still not fixed (and there is still no target hook as proposed + in PR92932). Just disable respective bogus optimization. */ + flag_ipa_icf_variables = 0; + if (flag_pic == 1) warning (OPT_fpic, "%<-fpic%> is not supported"); if (flag_pic == 2) diff --git a/gcc/testsuite/gcc.target/avr/torture/pr92606.c b/gcc/testsuite/gcc.target/avr/torture/pr92606.c new file mode 100644 index 00000000000..cc07128c73b --- /dev/null +++ b/gcc/testsuite/gcc.target/avr/torture/pr92606.c @@ -0,0 +1,57 @@ +/* { dg-do run } */ + +typedef __UINT16_TYPE__ uint16_t; +typedef __UINT32_TYPE__ uint32_t; + +typedef uint32_t T; + +#define NI __attribute__((noinline,noclone)) + + +#ifndef __AVR_TINY__ +#define read_u32(X) \ + (__extension__( \ + { \ + uint16_t __addr16 = (uint16_t)(X); \ + uint32_t __result; \ + __asm__ __volatile__ ("lpm %A0, Z+" "\n\t" \ + "lpm %B0, Z+" "\n\t" \ + "lpm %C0, Z+" "\n\t" \ + "lpm %D0, Z" "\n\t" \ + : "=r" (__result), "+z" (__addr16)); \ + __result; \ + })) +#else +NI uint32_t read_u32 (const uint32_t *p) +{ + return *p; +} +#endif + +static const __attribute((progmem)) T xyz_prog[] = { 123, 123, 123 }; +T xyz[] = { 123, 123, 123 }; +volatile int x = 0; + +NI void prf (T f) +{ + if (f != 123) + __builtin_abort(); +} + +NI void func_progmem() +{ + prf (read_u32 (&xyz_prog[0])); +} + +NI void func_ram() +{ + prf (xyz[x]); +} + +int main (void) +{ + func_progmem(); + func_ram(); + + return 0; +}