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commit bc93ab2946efe008bb0ce2d4d3c212bd01384fca
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Author: Ian Bolton <ian.bolton@arm.com>
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Date: Wed Apr 16 23:41:04 2014 +0100
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[AArch64] Define HAVE_RM_CTX and related hooks.
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diff --git a/ports/sysdeps/aarch64/fpu/math_private.h b/ports/sysdeps/aarch64/fpu/math_private.h
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index dbf203d..7424952 100644
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--- a/ports/sysdeps/aarch64/fpu/math_private.h
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+++ b/ports/sysdeps/aarch64/fpu/math_private.h
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@@ -209,6 +209,61 @@ libc_feresetround_aarch64 (fenv_t *envp)
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#define libc_feresetroundf libc_feresetround_aarch64
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#define libc_feresetroundl libc_feresetround_aarch64
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+/* We have support for rounding mode context. */
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+#define HAVE_RM_CTX 1
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+
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+static __always_inline void
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+libc_feholdsetround_aarch64_ctx (struct rm_ctx *ctx, int r)
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+{
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+ fpu_control_t fpcr, fpsr, round;
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+
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+ _FPU_GETCW (fpcr);
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+ _FPU_GETFPSR (fpsr);
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+ ctx->env.__fpsr = fpsr;
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+
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+ /* Check whether rounding modes are different. */
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+ round = (fpcr ^ r) & FE_TOWARDZERO;
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+ ctx->updated_status = round != 0;
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+
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+ /* Set the rounding mode if changed. */
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+ if (__glibc_unlikely (round != 0))
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+ {
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+ ctx->env.__fpcr = fpcr;
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+ _FPU_SETCW (fpcr ^ round);
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+ }
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+}
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+
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+#define libc_feholdsetround_ctx libc_feholdsetround_aarch64_ctx
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+#define libc_feholdsetroundf_ctx libc_feholdsetround_aarch64_ctx
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+#define libc_feholdsetroundl_ctx libc_feholdsetround_aarch64_ctx
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+
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+static __always_inline void
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+libc_feresetround_aarch64_ctx (struct rm_ctx *ctx)
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+{
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+ /* Restore the rounding mode if updated. */
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+ if (__glibc_unlikely (ctx->updated_status))
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+ _FPU_SETCW (ctx->env.__fpcr);
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+}
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+
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+#define libc_feresetround_ctx libc_feresetround_aarch64_ctx
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+#define libc_feresetroundf_ctx libc_feresetround_aarch64_ctx
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+#define libc_feresetroundl_ctx libc_feresetround_aarch64_ctx
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+
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+static __always_inline void
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+libc_feresetround_noex_aarch64_ctx (struct rm_ctx *ctx)
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+{
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+ /* Restore the rounding mode if updated. */
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+ if (__glibc_unlikely (ctx->updated_status))
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+ _FPU_SETCW (ctx->env.__fpcr);
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+
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+ /* Write new FPSR to restore exception flags. */
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+ _FPU_SETFPSR (ctx->env.__fpsr);
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+}
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+
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+#define libc_feresetround_noex_ctx libc_feresetround_noex_aarch64_ctx
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+#define libc_feresetround_noexf_ctx libc_feresetround_noex_aarch64_ctx
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+#define libc_feresetround_noexl_ctx libc_feresetround_noex_aarch64_ctx
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+
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#include_next <math_private.h>
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#endif
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