On 07/09/2021 10:15, Christophe Lyon via Gcc-patches wrote:
At some point during the development of this patch series, it appeared that in some cases the register allocator wants “VPR or general” rather than “VPR or general or FP” (which is the same thing as ALL_REGS). The series does not seem to require this anymore, but it seems to be a good thing to do anyway, to give the register allocator more freedom. 2021-09-01 Christophe Lyon <christophe.l...@foss.st.com> gcc/ * config/arm/arm.h (reg_class): Add GENERAL_AND_VPR_REGS. (REG_CLASS_NAMES): Likewise. (REG_CLASS_CONTENTS): Likewise. Add VPR_REG to ALL_REGS. diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h index 015299c1534..fab39d05916 100644 --- a/gcc/config/arm/arm.h +++ b/gcc/config/arm/arm.h @@ -1286,6 +1286,7 @@ enum reg_class SFP_REG, AFP_REG, VPR_REG, + GENERAL_AND_VPR_REGS, ALL_REGS, LIM_REG_CLASSES }; @@ -1315,6 +1316,7 @@ enum reg_class "SFP_REG", \ "AFP_REG", \ "VPR_REG", \ + "GENERAL_AND_VPR_REGS", \ "ALL_REGS" \ }@@ -1343,7 +1345,8 @@ enum reg_class{ 0x00000000, 0x00000000, 0x00000000, 0x00000040 }, /* SFP_REG */ \ { 0x00000000, 0x00000000, 0x00000000, 0x00000080 }, /* AFP_REG */ \ { 0x00000000, 0x00000000, 0x00000000, 0x00000400 }, /* VPR_REG. */ \ - { 0xFFFF7FFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x0000000F } /* ALL_REGS. */ \ + { 0x00005FFF, 0x00000000, 0x00000000, 0x00000400 }, /* GENERAL_AND_VPR_REGS. */ \ + { 0xFFFF7FFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x0000040F } /* ALL_REGS. */ \ }
You've changed the definition of ALL_REGS here (to include VPR_REG), but not really explained why. Is that the source of the underlying issue with the 'appeared' you mention?
R.
#define FP_SYSREGS \
