diff options
| -rw-r--r-- | gcc/avoid-store-forwarding.cc | 6 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/pr117835.c | 20 |
2 files changed, 21 insertions, 5 deletions
diff --git a/gcc/avoid-store-forwarding.cc b/gcc/avoid-store-forwarding.cc index 1b8c35b..fa83e10 100644 --- a/gcc/avoid-store-forwarding.cc +++ b/gcc/avoid-store-forwarding.cc @@ -238,11 +238,7 @@ process_store_forwarding (vec<store_fwd_info> &stores, rtx_insn *load_insn, { start_sequence (); - /* We can use a paradoxical subreg to force this to a wider mode, as - the only use will be inserting the bits (i.e., we don't care about - the value of the higher bits). */ - rtx ext0 = lowpart_subreg (GET_MODE (dest), it->mov_reg, - GET_MODE (it->mov_reg)); + rtx ext0 = gen_rtx_ZERO_EXTEND (GET_MODE (dest), it->mov_reg); if (ext0) { rtx_insn *move0 = emit_move_insn (dest, ext0); diff --git a/gcc/testsuite/gcc.target/i386/pr117835.c b/gcc/testsuite/gcc.target/i386/pr117835.c new file mode 100644 index 0000000..eac71aa --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr117835.c @@ -0,0 +1,20 @@ +/* { dg-do run } */ +/* { dg-options "-O -favoid-store-forwarding -mno-push-args --param=store-forwarding-max-distance=0 -Wno-psabi" } */ + +typedef __attribute__((__vector_size__ (64))) unsigned short V; + +__attribute__((__noipa__)) V +foo (V v, V) +{ + return v; +} + +int main () +{ + V a = (V){3, 5, 0, 8, 9, 3, 5, 1, 3, 4, 2, 5, 5, 0, 5, 3, 61886}; + V b = (V){6, 80, 15, 2, 2, 1, 1, 3, 5}; + V x = foo (a, b); + for (unsigned i = 0; i < sizeof(x)/sizeof(x[0]); i++) + if (x[i] != a[i]) + __builtin_abort(); +}
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