diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi index 055567b..b80ee02 100644 --- a/gcc/doc/sourcebuild.texi +++ b/gcc/doc/sourcebuild.texi @@ -1552,6 +1552,11 @@ ARM target generates Thumb-2 code for @code{-mthumb}. @item arm_vfp_ok ARM target supports @code{-mfpu=vfp -mfloat-abi=softfp}. Some multilibs may be incompatible with these options. + +@item arm_prefer_ldrd_strd +ARM target prefers @code{LDRD} and @code{STRD} instructions over +@code{LDM} and @code{STM} instructions. + @end table @subsubsection MIPS-specific attributes diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp index 8f793b7..4bf2424 100644 --- a/gcc/testsuite/lib/target-supports.exp +++ b/gcc/testsuite/lib/target-supports.exp @@ -2462,6 +2462,18 @@ proc check_effective_target_arm_iwmmxt_ok { } { } } +# Return true if LDRD/STRD instructions are prefered over LDM/STM instructions +# for an ARM target. +proc check_effective_target_arm_prefer_ldrd_strd { } { + if { ![check_effective_target_arm32] } { + return 0; + } + + return [check_no_messages_and_pattern arm_prefer_ldrd_strd "strd\tr" assembly { + void foo (int *p) { p[0] = 1; p[1] = 0;} + } "-O2 -mthumb" ] +} + # Return 1 if this is a PowerPC target with floating-point registers. proc check_effective_target_powerpc_fprs { } {